Setting Whirlwind GA-RW3B pitch on 912ULS

[efwd]

what are you using for pitch setting?
My 912is set between cruise and climb gets me about 115TAS in level flight. Im getting 5250rpm static WOT. I found that if I set the pitch any finer I would Redline the engine too easily once level.

[Geek]

what are you using for pitch setting?
My 912is set between cruise and climb gets me about 115TAS in level flight. Im getting 5250rpm static WOT. I found that if I set the pitch any finer I would Redline the engine too easily once level.

Mine is set to 17 degrees right now but no flight time on it. I got about 5300 static at WOT. That's with the 75" prop. Interested to know what you are running Eddie.

Geek

[efwd]

I referenced the rpm because I don't recall what the original setting I put in. By that I mean, when the airframe was level etc etc. Since that time, someone here had mentioned that it wasn't necessary to level the airframe each time pitch is changed. So, I just started at the baseline (that I don't recall) and started changing pitch (while in three point) until I found 5250rpm. You seem to be very close to my setting. I wouldn't change it. I think I originally set it for 5500 static WOT but if I pushed the nose over once I reached pattern altitude, I would easily reach 5800 rpm if I wasn't quick on the throttle. I also didn't enjoy the more turbulent days because each thermal would require I be hypervigilant as well. 5250rpm is suiting me fine.

[jiott]

That's what I use, 5250 rpm static, with my Whirlwind 70" GA-RW3B on a 912uls. A good compromise.

[Geek]

Thanks Eddie and Jim. I'll chime in later once I fly this thing. Still playing FAA but in the meantime - I got a hangar so that's progress!!!

G

[Geek]

For the definition of redundant - see redundant. Sorry about the double pump.

G

[desertdave]

Test flew the plane this morning and 5250 static is the sweet spot I was looking for. Climbs great at 65mph and cruses about 100mph indicated in the traffic pattern at 5200 RPM. Thanks all!

[jrevens]

I’m kinda’ late to the game here, but I just rechecked what I have mine set at… 21 deg. measured in level attitude. Same engine & prop as you. I’m at a higher field elevation than you Dave, but at 7,500 msl and 5350 rpm I cruise at a little over 120 mph. I’ve easily taken it up to 18,000’. Like Eddie, any finer pitch & it’s too easy to over-rev, & over-all performance is compromised. That’s just my experience, FWIW.

[efwd]

Okay, I'm back in the air. Fixing to fly to Phoenix today. I set up my pitch a bit more coarse than I had previously. I am currently 100 rpm less than what I had earlier (5250). So, at 5150 static WOT gives me about 10mph faster cruise than I had earlier. I took it out over the ocean where the air was very smooth and at 5500rpm I am now achieving 123mph TAS. If I run it at 5100 cruise I am now getting the speeds I once had while at 5500 rpm, about 110mph TAS.