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What's the correct motor pitch when mounting to a firewall?

Old 09-01-2007, 07:08 AM
  #26  
smokejohnson
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Originally Posted by phupper View Post
So the answer is, to move the CG back, add weight to the tail?
Or take weight off the nose for the same effect.
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Old 09-01-2007, 07:10 AM
  #27  
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Originally Posted by smokejohnson View Post
Correct. But don't add weight, take it off so it will fly better .
sorry! your right, for some reason I was thinking the other way...guess my pain meds are better than I thought!
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Old 09-01-2007, 07:58 AM
  #28  
phupper
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No prob! I've done that, glad we're all on the same page.

Ok I extended the landing gear forward so the nose won't dip on takeoff. Yeah I know it's ugly, but it's just for testing. I also changed to a smaller lipo. The CG is now at 2".

I have a good feeling about the next test flight. But who knows, that could be the nylon-reinforced-packing-tape talking. I'll post results.
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Old 09-01-2007, 02:03 PM
  #29  
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phupper, Yes, remove weight from the nose or add weight to the tail.

Also this brings up a new question.

If the plane was nose heavy, why did it climb a lot on you?

Check the incidence of the horizontal tail.
Make sure the stabilizer is parallel to the wing.

It was late last night I think we all were missing things.

Paul
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Old 09-01-2007, 06:44 PM
  #30  
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Originally Posted by pd1 View Post
phupper, Yes, remove weight from the nose or add weight to the tail.

Also this brings up a new question.

If the plane was nose heavy, why did it climb a lot on you?

Check the incidence of the horizontal tail.
Make sure the stabilizer is parallel to the wing.

It was late last night I think we all were missing things.

Paul
lol, that is being generous, Paul! but I think that is the main reason I was trying to go in the other direction, the climbing had me thinking it was tail heavy...
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Old 09-01-2007, 09:02 PM
  #31  
phupper
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"If the plane was nose heavy, why did it climb a lot on you?"

I think because the prop was too large. I had to take off with a lot of up-elevator to keep the prop from hitting the ground as the tail lifted. Moving the wheels forward as I did, should make the tail stay down during takeoff. I should be able to take off with little up-elevator now, and climb more slowly.
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Old 09-01-2007, 10:00 PM
  #32  
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phupper, Don't forget to let us know how it flies this time.

Paul
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Old 09-04-2007, 05:06 AM
  #33  
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It flies! I ended up taking the advice and cut off some of the nose, then moved everything back a few inches. The CG is now at about 1.75" back. Along with moving the wheels forward, takeoff was nice and smooth.

My first actual RC plane flight, I was surprized that it flew exactly like the simulator. I did 2 laps around the field like a pro. Then on a downwind leg, my prop-saver screws losened. When I lost power I was heading for trees. With no time to land, I had to let it glide over the trees toward an adjacent field, and out of sight. Funny, I think I was still trying to fly it in for a landing, even though I couldn't see it. The only part that broke was the tail, coincidently this was the only place I didn't cover with nylon packing tape (that stuff is amazing).

I thank you guys for all your help. I learned a lot of fundimentals of plane design. A few minor mods on this trainer, and some practice, and I'll be confident enough to try flying a nicer plane (like the Simple Corsair I built). I love my new hobby!:p
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Old 09-04-2007, 05:12 AM
  #34  
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Congratulations phupper, I'm glad to hear it went well for ya. I like to use Blue Loctite on my screws on the motor mounts and prop savers.
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Old 09-04-2007, 08:42 AM
  #35  
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Originally Posted by phupper View Post
It flies! I ended up taking the advice and cut off some of the nose, then moved everything back a few inches. The CG is now at about 1.75" back. Along with moving the wheels forward, takeoff was nice and smooth.

My first actual RC plane flight, I was surprized that it flew exactly like the simulator. I did 2 laps around the field like a pro. Then on a downwind leg, my prop-saver screws losened. When I lost power I was heading for trees. With no time to land, I had to let it glide over the trees toward an adjacent field, and out of sight. Funny, I think I was still trying to fly it in for a landing, even though I couldn't see it. The only part that broke was the tail, coincidently this was the only place I didn't cover with nylon packing tape (that stuff is amazing).

I thank you guys for all your help. I learned a lot of fundimentals of plane design. A few minor mods on this trainer, and some practice, and I'll be confident enough to try flying a nicer plane (like the Simple Corsair I built). I love my new hobby!:p
Thats great Glad your getting the hang of it I agree with Johnson, use some blue lock tight on the prop saver, Also, where the prop saver screws meet the motor shaft, grind a flat spot on the shaft, that will keep the prop saver from wanting to spin on the shaft, just a little some thing that I learned on Wattflyers Take care & have fun, Chellie
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Old 09-04-2007, 12:50 PM
  #36  
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phupper, Great news.

Paul
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