NR Propeller

[bbs428]

Received my new prop yesterday. It's an NR SR 106 2 blade scimitar style with a metal leading edge.
Looks nice. Low weight is impressive, 9.9 lbs. all up weight including bolts, backing plate and spinner.
Not including the 2" prop extension. The pitch tool is set at 16 deg. and can be adjusted plus or minus
7 deg.

It will be awhile before I can do any testing

Air Trikes re-brands the Luga under "Kool", and some refer to the luga as an "NR prop", presumably
the initials of the inventor (Nick Roman)
So:
LUGA = KOOL = NR Prop.

Propeller.jpgpitch tool1.jpgPitch tool +7 or - 7 degrees.jpgPropeller total weight.jpg

[WWhunter]

Hmm, that sure is a different way to set the pitch. Are you worried at all about any flex in that rod that runs from the prop hub to the blade section?

[bbs428]

The pitch tool is extremely stiff. Also looks like it was welded or soldered
on the back side with witness marks.
I tried to flex it a little and I couldn't deflect it.
I'm sure I could bend/break it if I really put the muscle to it or stomped
on it.

pitch tool2.jpgpitch tool3.jpg

[jrthomas]

Hmm, that sure is a different way to set the pitch. Are you worried at all about any flex in that rod that runs from the prop hub to the blade section?

I have a Kiev prop that is a very similar design and it uses an identical pitch tool. It's very simple and it works very well. Flex is not an issue. I wonder if all these similar props are designed and built by the same people.

[bbs428]

My understanding is they were all designed by Nick Roman
and marketed under different names. Luga being the most well known.

[WWhunter]

Ok, that explains it better. I thought it was just that screw holding the shaft. I could see that pivoting slightly if not very tight. But being welded, makes much more sense. Thanks!

[KenZ]

Thanks for the response, Roman sent me the same info5. RECOMMENDATIONS FOR USE

5.1 Before operating the propeller carefully read the rules of its assembly, operation and maintenance.
5.2 Prior to the assembly and installation of the propeller on the aircraft the following is required:
Check availability of parts and components in accordance with section 6 of the passport;
visual inspection of the parts to check the status after transport;
install the blades into the hub slot in accordance with the blade and bearing markings after securing with bolts;
set the angles of the blades using a ruler whose “0” corresponds to __17____. No gaps along the ruler or blade edges are allowed;
tighten the hub bolts with 2,3 kg m force and lock them;
set screw on the seat of the motor flange and fix with bolts with tightening force 2,5 kg m, lock them;
5.3. Following this recommendation will ensure proper assembly and operation. The propeller is balanced, eliminating vibration and ensuring the normal operation of the engine.


Best regards Roman

DOnt know why they just don't send a manual with the prop.
Now I need to read the "rules of assembly, operation and maintenance". which was not supplied.
Ken

[KenZ]

I just received my prop from NRprop today and looks great. Installing on my O-320 160 HP lycoming. Roman says its good for the HP.

Any body out there have a starting point for the pitch?
Torque on the bolts?
Ken

[Dave S]

Ken,

A good place to check with is the prop manufacturer. Often they can guide a person based on other customers experience with the same engine/prop combo.

[bbs428]

Hey Ken,

I wrote Roman and for my prop assy. he responded:

Hello Brett !

5. RECOMMENDATIONS FOR USE

5.1 Before operating the propeller carefully read the rules of its assembly, operation and maintenance.
5.2 Prior to the assembly and installation of the propeller on the aircraft the following is required:
Check availability of parts and components in accordance with section 6 of the passport;
visual inspection of the parts to check the status after transport;
install the blades into the hub slot in accordance with the blade and bearing markings after securing with bolts;
set the angles of the blades using a ruler whose “0” corresponds to ______. No gaps along the ruler or blade edges are allowed;
tighten the hub bolts with 2,1 kg m force and lock them;
set screw on the seat of the motor flange and fix with bolts with tightening force 2,3 kg m, lock them;
5.3. Following this recommendation will ensure proper assembly and operation. The propeller is balanced, eliminating vibration and ensuring the normal operation of the engine.

Best regards Roman

Вы писали 12 мая 2023 г., 13:49:35:

Дорогий сер, Яке правильне значення крутного моменту гвинта до фланця коробки передач і крутний момент затискних болтів лопаті? У мене 912ul Zipper @110hp і 2-лопатевий пропелер SR-106. Будь ласка, в дюймах-фунтах і/або футах-фунтах, якщо можливо. Дякую тобі,

Dear sir, What is the proper torque value of the propeller to the gearbox flange and the torque of the blade clamping bolts? I have a 912ul Zipper @110hp and a 2 blade SR-106 propeller. Please in inch lbs and/or ft lbs if possible. Thank you, Brett

I had a heck of a time finding the torque values as well. Go to the NR website and shoot him an email on your specific prop. Took about 3-5 days for him to respond to mine. I had to use an online converter from kg to inch/ft lbs. As for pitch, I started at 16deg.