Motor thrust angle

asus11 · Aug 07, 2012, 02:59 PM

READING THE GRAND CRUISER THREAD i SAW THAT THE THRUST ANGLE HAS BEEN ADJUSTED DOWN BY ADDING 2 MM SPACER BEHIND THE TOP 4 MOTOR MOUNT SCREWS, i DID THAT BUT IT LOOKS LIKE THEY ARE POINTING DOWN QUITE A BIT. MAIDEN FLIGHT WONT BE FOR A WHILE BUT I WANT TO HAVE THIS RIGHT BEFORE I START BUILDING THE 182 TRAINER COMING SOON. IF YOU HAVE NOT HEARD OF THIS MOD IT IS TO STOP PLANE FROM CLIMBING WITHOUT UP ELEVATOR. 1MM 2MM OR SOMETHING ELSE? THANKS FOR INPUT. GREG

Butch777 · Aug 08, 2012, 01:51 AM

Usually I set the motor angle and the C/G where the plans recommend it.
Then I fly the plane and trim it level at medium cruse speed.
I then bring it down and see if the elevator is level or not.
If its about level, the the C/G is usually ok.
The I launch it again and put it into level medium cruse speed and then hit full power to see how much it climbs. With any power increase, it should climb some.
If it climbs too much, then I shim the motor down a bit and try it again.

If when you first launch it and it climbs like crazy, with the elevator trimmed level, then let it get up there a bit and chop the power to see if it glides slightly down as it should. If it glides at a down angle(as it should with the elevator trimmed level), then the motor angle needs to be lowered.

asus11 · Aug 08, 2012, 06:58 AM

Butch, thanks for the info., I will take out the 2 mm shims and wait for the maiden then see whats needed. I added the 2mm shims before maiden because of posts in foamies kits ( grand cruiser ) stating that the GC climbs too much on its own right out of the box but after seeing how much 2mm tipped the motors, it just didn't look right, hence this thread.

Aug 07, 2012, 02:59 PM	#1
asus11 Registered User United States, NY, Farmingville Joined Jul 2012 17 Posts	Motor thrust angle READING THE GRAND CRUISER THREAD i SAW THAT THE THRUST ANGLE HAS BEEN ADJUSTED DOWN BY ADDING 2 MM SPACER BEHIND THE TOP 4 MOTOR MOUNT SCREWS, i DID THAT BUT IT LOOKS LIKE THEY ARE POINTING DOWN QUITE A BIT. MAIDEN FLIGHT WONT BE FOR A WHILE BUT I WANT TO HAVE THIS RIGHT BEFORE I START BUILDING THE 182 TRAINER COMING SOON. IF YOU HAVE NOT HEARD OF THIS MOD IT IS TO STOP PLANE FROM CLIMBING WITHOUT UP ELEVATOR. 1MM 2MM OR SOMETHING ELSE? THANKS FOR INPUT. GREG

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Aug 08, 2012, 01:51 AM	#2
Butch777 Registered User Livermore, CA Joined Sep 2004 8,429 Posts	Usually I set the motor angle and the C/G where the plans recommend it. Then I fly the plane and trim it level at medium cruse speed. I then bring it down and see if the elevator is level or not. If its about level, the the C/G is usually ok. The I launch it again and put it into level medium cruse speed and then hit full power to see how much it climbs. With any power increase, it should climb some. If it climbs too much, then I shim the motor down a bit and try it again. If when you first launch it and it climbs like crazy, with the elevator trimmed level, then let it get up there a bit and chop the power to see if it glides slightly down as it should. If it glides at a down angle(as it should with the elevator trimmed level), then the motor angle needs to be lowered.

Aug 08, 2012, 06:58 AM	#3
asus11 Registered User United States, NY, Farmingville Joined Jul 2012 17 Posts	Butch, thanks for the info., I will take out the 2 mm shims and wait for the maiden then see whats needed. I added the 2mm shims before maiden because of posts in foamies kits ( grand cruiser ) stating that the GC climbs too much on its own right out of the box but after seeing how much 2mm tipped the motors, it just didn't look right, hence this thread.