PDA

View Full Version : IVO InFlight Adjustable



Norm
10-05-2015, 02:02 PM
I got three new to me IVO blades in the mail todayfor my 912 and want to use them with the inflight adjustable setup I have for my 582. i have heard rumblings that the inflight adjustable works best with the low pitch IVO as compared to the high pitch IVO. Is this true or is it the other way around.
Thanks for your insights
Norm

av8rps
10-06-2015, 05:20 AM
I use a low pitch 68 inch diameter 3 blade IVO IFA on my 912ul 81 hp Kitfox 4 on amphib floats and love it (except for the stainless leading edge tape that doesnt last. If I didn't fly water I would just use 3m rocker panel plastic tape and throw away the stainless tape).

The higher pitch blade (which I've tried for the first 50 hours on my plane) would not allow me to get full rpm/full power when pitched as flat as it will go (wouldn't even get me 5200), and at the top end I learned that the 912ul doesn't have the power to utilize all the pitch the blade is capable of. So in effect, much of the built in blade pitch is wasted.

The low pitch blade however will actually allow you to overspeed at low pitch (so use the supplied pitch stop washers to avoid overspeeding your engine), but is just right at full pitch (WOT at full pitch on a cool day will get me to 5400-5500 rpm on a 68 inch 3 blade), and therefore will provide a significant increase in cruise speed..

If I weren't flying on floats the higher pitch blade would be ok, but I'd rather have the blade that allows me to use full rpm on takeoff and climb.

That's my two cents on that subject...hopefully that helps answer your question.

Paul Seehafer

Norm
10-06-2015, 04:58 PM
Thanks for the info that is what I was looking for. THis is going on an older 912 UL so I may have to cut the prop to 68. It is currently 72. Because it is an older 912 the prop hub from the 582 and electric setup will fit. Odd that you can't get the IVO to depitch enough to use the power.
Thanks again for the comments.
Norm

sourdostan
10-06-2015, 06:34 PM
Norm, I have used a 70" IFA IVO on my Model IV Speedster 1200 with a 912ul for over 1800 hours--works wonderfully well. I suggest you start with the 70" before cutting to 68". Also, I use the mylar leading edge tapes I get from Warpdrive--they don't crack like the ss tapes do, and hold up forever.

Stan

Norm
10-06-2015, 06:39 PM
Good Plan I have a friend that cut his prop and was never happy with it after that. I will try full 72 first and go from there.
Norm

av8rps
10-07-2015, 03:06 PM
I agree to try the prop before cutting it down. I have a 72 inch that I will use for tbe best off the water performance, at the expense of top speed. I don't have a 70 inch to try, but that could be the best all around prop size for climb and cruise. So, if you do cut your blades down, try 70 inches first.

t j
10-07-2015, 04:28 PM
I got three new to me IVO blades in the mail todayfor my 912...

Wouldn't the 582 inflight adjustable setup adjust the blades the wrong direction on the 912?

Norm
10-07-2015, 07:30 PM
The electric motor just goes in or out. It does not care which way the blades are turning. Same as the adjustable screw. I am lucky in that this is an early 912. I understand that if this were a later 912 the prop hub would not fit. The plane is still a long ways from flying as I am doing a rebuild but getting stuff ready including switching from a 582 to the 912. Thus the new prop but want to use the inflight adjustable when ready.
Norm

wannafly
10-09-2015, 06:39 PM
I have the IVO Medium. Have about 300 hrs on and it works great. But I am thinking of trimming it back a bit. For those who have trimmed there prop, what did you use to trim it? I'm still at 72" but is just a bit much. I think I will start at 1/2 inch off.

Norm
10-09-2015, 09:42 PM
From the IVO website it says to use a hacksaw.
• If you wish to increase top speed or decrease cruise RPM, switch to a 2-blade prop or
cut the 3-blade prop to smaller diameter using a hack saw. As long as you cut the same
length piece from each blade, the prop will remain in balance.


I would be careful about trimming the ends if you are getting good rpm cause I know you want to do more sandbar landings. A longer prop usually gives more pull and better climb.

kitfox2009
10-10-2015, 12:05 PM
Hi guys
I have over 400 hours now on a 70 inch IVO IFA Ultralight prop with a 912 UL on my Vixen.
Have no problem getting full RPM on takeoff and could also "overload the engine" with excessive pitch on cruise if you wanted to. I think it is a good idea to have a manifold pressure gauge with the in flight props.
I would be careful trimming the tips with the chance of unbalancing the prop.
They are pretty smooth. Be a shame to bugger it up.
Happy Thanksgiving.
Don

Norm
10-11-2015, 09:14 PM
Hi Don
Had a good Turkey today. I hope your Thanksgiving was great.
What RPM do you get on takeoff. It looks like you have the high pitch prop looking at your photo albums so I am curious.
Norm

kitfox2009
10-12-2015, 06:54 AM
Hi Norm
Not sure about about the pitch. The model is a UR370+PE KFOX /912/80.
I told IVO the aircraft and engine type and this is what was recommended.
I get 5800 on takeoff and start putting a bit of pitch in through climb out to maintain 5500 or so. I usually cruise at 52 to 5400 if I want to get somewhere . Hardly ever run it under 5000 unless in the circuit.
When are you in the air?
Cheers
Don

Norm
10-12-2015, 07:00 AM
I hope I can get those numbers out of my Fox. It will be a long time before I get my Model IV in the air, but I fly the Buzzard weekly. Probably why the fox is taking a long time to get going. Did you make it to this way this year?
Norm

av8rps
10-13-2015, 07:01 AM
I'm glad to hear of success with the 70 inch. I think that just might be the best compromise overall. However, as stated, if I had a 72 inch I'd try that before cutting it down.

When I had to cut my blades down (due to water erosion when I tried the plastic prop-guard) I measured as accurate as I could, and then when done I weighed them with a really accurate scale, which told me I had to sand some off one blade yet (not even measurable however). My new cut down blades run really smooth doing it that way. So that would be my recommendation if you decide to cut your blades down later.

It's ironic how different we all operate our planes that are so similar, but apparently yet so different. I commonly will fly my 912ul around under 5,000 rpm, as it operates so smooth in the 4600-5000 range. And with full pitch and only 4800 rpm I easily cruise around at 105 mph with still probably an inch and a half of throttle available (and remember, I'm on 230 lb amphib floats). At 5200-5400 I feel like the engine is not as smooth. Oh, and for anyone wondering, I have verified both my ASI accuracy multiple times, as well as my tachometer accuracy. So these are real numbers.

I would love to see how my plane would do with an IVO prop and a big bore 912 putting out 110+ hp. I think that would be really SWEEEET!!

Has anyone out there flown a model 4 with the 100 hp 912 and the IVO IFA? If so I'm curious what performance you are seeing.

herman pahls
12-22-2015, 05:56 PM
Hi Paul
I read this thread because I am interested in trying a Ivo prop on my model 4 Kitfox with 912 100hp on 29" ABW's.
I was hoping to hear from someone who has experience with this combination.
I have flown the IVO inflight adjustable for years on my 582 powered model 2 with excellent results.
With my 912 100 hp I have had great results with the Warp, 3 blade, 70" and taper tip but struggle with how long it takes to adjust the pitch.
I wish for the inflight adjust feature for getting 5800 RPM for take off without spending $7000 for the alternative.
I also would like to know how the IVO-IFA prop performs on a 100 hp 912 in a Kitfox.
Thanks
Herman

Thanks again for the sea plane base tour Oshkosh 2014

kmach
12-22-2015, 07:58 PM
The IFA Ivo medium three blade should be what your looking for.
I have been using this on my 912 uls for around 300 hrs. I had a sensenich ground adjustable ez pitch on it before, I couldn't go back to a fixed or ground adjustable now !
I have the limiters set as to get the full 5800 on takeoff , and then usually set it for 5200 - 5400 cruise.
Todays flight -8C , climb 1200 fpm, cruise 5250 rpm, 108 IAS with wheel skis on , 70 lbs luggage , full fuel and 230 pilot .:)

On a model 4 with the 912 uls you should get some real nice performance.
I'm sure others with that exact setup will chime in.

Esser
12-24-2015, 10:38 AM
Is that 108 Knots?

DesertFox4
12-24-2015, 11:27 AM
Classic model 4- 661 lbs. empty weight.
Rotax 912 uls
Ivo in-flight Patriot prop.
Pilot - 210 lbs
Full fuel
5300- 5500 rpm's @ 5.8 gals per hour fuel flow.
Altitude. 4,500' above sea level
120-125 mph cruise
Top speed level full throttle- 132 mph.

Speed mods- stut fairings.

Slyfox
12-24-2015, 12:30 PM
mine is a constant 103kts GPS. :D

kmach
12-24-2015, 02:50 PM
Is that 108 Knots?

No, mph .

108 Knots would be nice !

This is at 3000' asl and at 1340 take off weight.

herman pahls
12-26-2015, 10:11 PM
Thanks Kmach, Desertfox4 and Slyfox for posting that you are using and apparently pleased with the IVO medium IFA prop since I am considering trying one on my model 4-912 100hp.
I currently use a Warp Drive (WD) 70" 3 blade taper tip with nickel leading edge protection.
I am pleased with the sea level performance of the WD other than how long it takes to adjust the pitch and that fixed pitch is always a compromise in performance..
I have been warned that my WD prop may be exceeding the Rotax recommended mass moment of inertia (MMI) and causing premature damage to the gear box and sprague clutch.
So I started shopping for props with less MMI.
I am considering the Prince suggested 80" fixed pitch prop ( $2400 ) but I would need extended gear (Grove $2100. ) to get adequate prop clearance even with 29" ABW's I am already using.
Extended gear + Prince prop = $4500.
The only IFA props that I am familiar with are the IVO and the Airmaster.
Both of which heavier than the Warp but possibly less MMI due to less weight at the blade tips.
John McDean at Kitfox is a big fan of the Airmaster.
The $7000. for the Airmaster and the added 10-12 pounds on the nose of a model 4 are a concern.
The IVO medium appears to be 4 pounds lighter than the Airmaster.
With the IVO and the Airmaster I would not need extended gear thus saving $2100..

So the questions I have for the IVO medium IFA prop users.
If money were not an issue would you be flying an Airmaster?
Do the IVO medium IFA or Airmaster exceed the Rotax recommended MMI?
If so it does not seem to be a major problem.
Would the all around performance difference between the IVO and the Airmaster be worth the additional approx. $4300 ?

Thanks for your consideration.
Herman

DesertFox4
12-26-2015, 10:41 PM
Herman, my Ivo is not a medium. The Patriot is a lighter prop. It is about maxed out on the 100 hp Rotax but works very well and is less money than the medium. I still would go with the Medium Ivo thogh as the pitch change motor is more robust than those used in the lite prop line.

Slyfox
12-27-2015, 07:19 AM
I had the patriot on my 100 when I first installed my motor. It worked, but don't put full power on take off, mine cavitated, slipped out like a boat that lost it's grip. The rpm's went way up, I caught it before it did any damage. but I was just coming off the runway when it did it. I heard of it, so I was kind of waiting for it, I backed off the throttle and it caught again. I went and ordered my medium and would not trade that prop for anything, I love it.

Av8r_Sed
12-27-2015, 07:20 AM
I have been warned that my WD prop may be exceeding the Rotax recommended mass moment of inertia (MMI) and causing premature damage to the gear box and sprague clutch.
So I started shopping for props with less MMI.


Hi Herman,
Have you measured the MMOI of your current WD prop configuration to know if you're inside of the 6000 Kgcm^2 limit? I'm not sure why prop manufacturers don't provide this information, but it doesn't seem to be widely available. I've heard that a three blade 68" taper tip is under.

Esser
12-27-2015, 08:14 AM
Just to clear one thing up. The Airmaster is not an IFA prop. It is a fully constant speed prop and that is why it's performance is way above everything else.

The IVO is an IFA and there is a constant speed controller unit for it but I haven't heard great things. An IFA is better than a ground adjustable for sure but if you are looking for the ultimate performance, the Airmaster is head and shoulders above the IVO

This is an excerpt from a message WarEagle sent me regarding his Airmaster:

"But I fly with a four other Kitfoxes with 912s and the same CS prop that I have and many times we meet other kitfoxes that fly with us with the IVO IFA on their 912's equipped fox. The IVO's can take off first then the the planes with the same CS prop as mine take off and the IVO's get caught up to and then passed in less than 20 minutes off the deck. It's a pretty cool sight to watch because the IVO guys can't believe what they are seeing. While we don't have hard numbers to give you I would guess that these CS equipped planes are seeing at least 4-6 mph (over the IVO guys) on cruise and probably 100 - 150 fpm better on climb out. "

kmach
12-27-2015, 08:53 AM
If money was not a factor , I would select the Airmaster as first choice.

My personal story,
I had the 2 blade Sensenich ez pitch , a very nice prop.
I always read of a three blade prop being smoother and was intrigued by the three blade IVO GA and how it adjusted. A medium 3 blade ground adjustable came up for sale on barnstormers for a decent price so I bought it.

I liked how the GA IVO medium performed, but I knew there was the ability to make it an IFA, so it eventually was made into an IFA.
So far the best setup that I have had.
I would like to try the Airmaster with Whirlwind blades , but I can't justify the dollars to switch at this point.
Maybe one day ?

P.S. I put John McBean's advice very high and take it for being about the best there is.

herman pahls
12-29-2015, 10:53 PM
I appreciate your responses regarding the IVO IFA props.
I will try to summarize what I have learned from several members on this forum by posts, PM's and phone calls.
I was searching for a new prop because I was getting the impression that I was prematurely damaging my 912ULS engine, gear box, starter and sprag clutch by using the 70" Warp Drive, taper tip with nickel leading edge.
So I called Warp and they told me my WD prop's MMoI was just over 5000 which is short of the Rotax suggested 6000.
I tried calling IVO to find out what the IVO Medium IFA props MMoI is but they are not open till the 1st of the year.
Warp claims my prop weighs 10#'s, IVO online says the medium weighs 17.2 #'s, the Airmaster weighs 26 #'s (and uses Warp or Whirl Wind blades) and the Whirl Wind 3 blade ground adjust weighs around 9 #'s from what I could find.
I talked to 2 Kitfox owners that use the Airmaster.
One was getting 130 + mph on 26" ABW's burning 4+ GPH with the smooth model 7 cowl. Your life would be on the line if you tried to take that prop away from him.
The other was getting much less cruise and higher fuel burn, also on 26" ABW's but with a round cowl model 5. This owner is considering a long Prince prop because he felt that from riding with Steve Henry in his Highlander that the take off and climb was significantly better than his Airmaster at 5800 RPM and the Prince was only turning 5300 RPM. Also, he felt the Prince prop fit his flying interests better even with a loss of cruise speed.
Since the Airmaster would add 16 pounds to the nose of my model 4 and hiding $8000. from my wife is not an option at this time, I will not be flying with a real constant speed prop in the near future.

My Conclusions regarding some of the props used for Kitfox's with 100 hp engines.

The Prince is right up there with being the best if not the best short field prop.
I do not know of any flying on a Kitfox to hear what cruise speed they get.
Larry will be telling us soon.
My concern is having to send the Prop back and forth to the factory to get the pitch right if needed.
This long prop really needs tall tires and extended gear to get the blades out of harms way.
This is probably the lightest prop and only takes 5 minutes to install and torque. That appeals to me.

If affordable, I would have an Airmaster. I love not chasing the RPM.
I feel they are a better fit for the Super Sports than the model 4's or possibly the 5's due to dealing with the extra weight and C.G..
All around performance and fuel burn would be hard to beat.

We possibly need to convert round cowls to smooth cowls for efficiency.

Warp Drives are probably the least damage prone prop, and in my Kitfox give good climb and cruise and could be used to chop wood when you replace it.

Warps and IVO ground adjust are probably the best bang for the buck from what I could find. Possibly the best seaplane prop option.

The Whirl Wind is probably the lightest, most efficient and vulnerable to damage and reasonably priced.

Since I want maximum RPM for gravel bar hopping and decent cruise when trying to get somewhere, the ease of making pitch changes would make the IVO my first choice from what I know now.If I go with Big Bore cylinders my current WD will need to be replaced.

If you know what the weight and MMoI is on the props you have used, please share that info..
If my information is not correct or you know of better options please let me know.
If you have an IVO medium prop for sale, I am interested.
Herman

Geowitz
12-30-2015, 08:37 AM
IVO won't give you a MMOI. At least they wouldn't when I purchased from them. However, I did my own test and the results of a medium 72 inch 3 blade and 2 blade are posted in this thread...

http://www.teamkitfox.com/Forums/showthread.php?t=3803&highlight=ivo+moment+inertia+geowitz&page=2

3 blade medium 72 inch with in flight adjust = ~ 7800 kg cm2
2 blade medium 72 inch with in flight adjust = ~ 5300kg cm2

The original link to the test procedure is bad, but this video is how I did it.

http://www.eaavideo.org/video.aspx?v=2010764613001

herman pahls
12-30-2015, 10:54 PM
Geowitz
Valuable video showing how to test for MMoI.
I wonder how many are going to stop using the 3 blade IVO medium because it exceeds the Rotax recommended MMoI.
Now I am now curious how my Warp Drive will test even though WD told me it would be just over 5000.
Any suggestions of what wire to use? Diameter?
It seems like the initial angle the blades were rotated was vague.
Maybe it is not that important.

Any other confessions what the MMoI of the other brands of props is?
I am curious how the Airmaster would test with Whirl Wind and Warp blades.
Herman

Geowitz
12-31-2015, 07:27 AM
Here's the service information from Rotax with written instructions.

http://www.ultralightnews.ca/cdrive/massweight.pdf

The wire is just described as "thin". I used .035 MIG wire since it was handy around the shop. The initial degrees of rotation is not exactly critical, but they say 5 to 10 degrees.

I don't think many (if any) would stop using the IVO... So far it doesn't seem to really be an issue at least with the medium on the 100hp.

raffdhc6
02-26-2018, 03:08 AM
Hi Norm
Not sure about about the pitch. The model is a UR370+PE KFOX /912/80.
I told IVO the aircraft and engine type and this is what was recommended.
I get 5800 on takeoff and start putting a bit of pitch in through climb out to maintain 5500 or so. I usually cruise at 52 to 5400 if I want to get somewhere . Hardly ever run it under 5000 unless in the circuit.
When are you in the air?
Cheers
Don

Hi Don, I own a Kitfox 5 outback rotax 912 ul with a CSG 68 prop. I have 2 Ivoprop light - 1 is standard and the other Patriot (thinner) 1 blades is 34 iches. What is the blade you are using? What is your cruise speed at 75% power. Cheers Raff

kitfox2009
02-26-2018, 09:33 AM
G`morning Raff
When I bought my Vixen it came with a 68 inch GSC. I never did fool around with the pitch but if I remember correctly it flew at MAX high 90`s MPH at about 5500 RPM at 2500 ASL.

I changed to a 70 inch IVO IFA on the recommendation of many folks on this forum. I elected to go with the Ultralite model as my 912UL is a mid 90`s version and may have a lighter drive than later engines. I sent the engine serial number and a/c type to IVO and ordered their recommendation,so I am not sure if it is Patriot blades or not. The prop now has over 600 hours on it, and like has been mentioned, the planetary/motor assembly on these is pretty small and can be subject short life if you are constantly dinking around with the pitch controller!
I would say this is a good low budget IFA setup for the 80 HP engines but, of course with deep pockets and 100+HP the Airmaster is definitely the way to go.
I am always surprised at how much throttle and/or pitch adjustment is necessary on cross country flights, especially in the mountains. The CS and a bunch of cash would take care of that!!
Oh, to answer your question, I can now cruise at 115 or so with the IVO.

I really believe in order to get performance and efficiency out of these small engines IFA pitch really helps.
Good luck with your experiment.
Cheers
Don

av8rps
03-02-2018, 07:02 AM
If the IVO IFA is set up properly, just as the electric motor is starting to run to the end of its limits (and is starting to bind) the circuit breaker should turn off. I move my IVO prop switch probably 20 to 30 times every time I fly and I've had the same prop motor for more than a decade.

My recommendation to anyone going with an IVO IFA: Follow the directions on how to set up the limiting washers so the motor isn't overloaded, and do not shorten the wires for the switch and the breaker as the resistance in the wire is part of the design.

Maybe I've just been lucky all these years with my motor, but my luck usually goes the other way ;)

Oh, and I have another plane that has a Hartzel Constant Speed prop on it. It works very well, but it also costs 20+ grand. By comparison the IVO is a incredible value. If they could just solve the short life stainless leading edge tape issue I would be tickled pink over the IVO IFA.

kitfox2009
03-02-2018, 09:29 AM
HI av8rps
I your IVO the Ultralight or Medium model?

av8rps
03-05-2018, 10:07 PM
Ultralight version with the low pitch blades. I originally had the higher pitch blades and I couldnt get static rpm any higher than 5 grand when pitched flat for takeoff (too much molded in pitch in prop). A 100 hp 912 would do fine with the higher pitched or the Patriot blades, but for my 81 hp 912 the lower pitched blades work better.

kitfox2009
03-05-2018, 10:57 PM
Sounds good. Mine must be the same, then.

little rocket
08-01-2018, 07:20 AM
What static RPM are guys setting the prop for as a maximum and how many washer/spacers are you putting in to limit it so that it can't over rev on takeoff?
THANKS

kmach
08-01-2018, 01:06 PM
I set my Ivo IFA 3 blade medium on my 912 uls for colder tempatures so that I could get 5800 On take off , for ski flying. In summer temps it will overspeed if you have it set full fine. You get to know where to set it or adjust while rolling to avoid over revving.

I have a medium 3 blade Ivo IFA available for sale now if some one is interested .

Sweere
08-03-2018, 08:47 AM
Hi Kevin,

I’m interested in your IFA prop if you could send me some more information on what comes with it and what type of price you’re at.

Thanks, Mike

kitfox2009
12-28-2019, 08:31 PM
From the IVO website it says to use a hacksaw.
• If you wish to increase top speed or decrease cruise RPM, switch to a 2-blade prop or
cut the 3-blade prop to smaller diameter using a hack saw. As long as you cut the same
length piece from each blade, the prop will remain in balance.


I would be careful about trimming the ends if you are getting good rpm cause I know you want to do more sandbar landings. A longer prop usually gives more pull and better climb.

Happy New Year guys
I know this is an OLD thread but I have a couple of questions regarding my 70 inch IVO IFA Ultra Light prop. I have run this now for over 700 hours on a Rotax 912 UL (80HP). over this period I have replaced the pitch motor once, the spool (stripped threads) twice, The carriers and pinion a number of times. Anyway the prop works very well, smooth and allows for better engine performance and fuel economy.
BUT, Today I removed the IFA hub and installed my Ground Adjust plate for use while I am waiting for another "lead screw assembly" due to stripped threads on the "spool". I never noticed this before but in order to achieve fine pitch on the ground adjuster there is quite a bit of resistance required on the adjusting shaft!

I am wondering if this excessive force required is what is prematurely damaging these IFA parts. The prop was purchased from IVO 9 years ago on their recommendation. It is possible that I have the "high pitch blades" The model says UR 370+PE. Not sure what that means.
I know is is very easy to lug the engine with very little adjustment in flight.

I am thinking of cutting the prop down in small increments. Do any of you folks have experience doing this? Do not want to mess up the balance. I suppose the other option is to purchase new blades low pitch.

I realize many of you guys have gone on to bigger and better things (airmaster,etc) but my next birthday will match my HP so I would prefer to just fly a bit more without beating up the family`s inheritance too badly.

Cheers and HAPPY NEW YEAR to the KF forum folks
Don Hudgeon

kitfox2009
12-28-2019, 08:44 PM
Happy New Year guys
I know this is an OLD thread but I have a couple of questions regarding my 70 inch IVO IFA Ultra Light prop. I have run this now for over 700 hours on a Rotax 912 UL (80HP). over this period I have replaced the pitch motor once, the spool (stripped threads) twice, The carriers and pinion a number of times. Anyway the prop works very well, smooth and allows for better engine performance and fuel economy.
BUT, Today I removed the IFA hub and installed my Ground Adjust plate for use while I am waiting for another "lead screw assembly" due to stripped threads on the "spool". I never noticed this before but in order to achieve fine pitch on the ground adjuster there is quite a bit of resistance required on the adjusting shaft!

I am wondering if this excessive force required is what is prematurely damaging these IFA parts. The prop was purchased from IVO 9 years ago on their recommendation. It is possible that I have the "high pitch blades" The model says UR 370+PE. Not sure what that means.
I know is is very easy to lug the engine with very little adjustment in flight.

I am thinking of cutting the prop down in small increments. Do any of you folks have experience doing this? Do not want to mess up the balance. I suppose the other option is to purchase new blades low pitch.

I realize many of you guys have gone on to bigger and better things (airmaster,etc) but my next birthday will match my HP so I would prefer to just fly a bit more without beating up the family`s inheritance too badly.

Cheers and HAPPY NEW YEAR to the KF forum folks
Don Hudgeon


Has or is anyone running a 68 or 69 inch with the high pitch blades? What are the results? I have an inquiry into IVO as well about cutting down these blades so the adjuster does not have to max out for fine pitch. The breaker has never blown!

avidflyer
12-28-2019, 09:12 PM
Pretty sure the + means high pitched blades. JImChuk

Dusty
12-29-2019, 01:36 AM
I run an ivo on an 80 hp. My old motor had 68 inch fine pitch blades and I could just get enough adjustment to keep my revs in check. My new 80 hp motor with the 100 hp ratio ( I believe this the default ratio now) would redline at 3/4 throttle with these blades. I installed the high pitch blades at 72 inch but the 80 wouldn't get above 4800 static at full fine so I shortened them down in place with a cutoff grinder at 1/2 inch at a time. 68 is where I could get 5300 static ! Take off performance is identical but cruise is at least 5-10 kts faster than the original setup. After I was happy with the length I removed and checked the balance it was spot on.
i hope this is of some help
cheers
Dusty

Maverick
01-04-2021, 03:59 PM
How often do you torque your prop bolts?