Originally Posted by grosbeak

Spent the day at the field yesterday and got a lot of flying in. The CG - 164 mm behind the LE - is now perfect. And I'm noticing much better performance, especially in vertical uplines, since I shed all that weight.

Thanks for your help and encouragement.

Originally Posted by Dale Hunter

Having fun now, aren't we.
Enjoy the flying, and the steps learned.

-Dale-

Originally Posted by grosbeak

I put it on the scales in the shop this evening and changed the specified CG in the spreadsheet from 150 mm from the leading edge (Slipstream's spec) to 173 mm (centre of wing tube). I entered the readings from the scale and was surprised to find that my changes at the field had only moved the actual CG back from 150mm to 159mm. I thought back to when I bought the plane from its previous owner - at the time the receiver battery was mounted just aft of the wing tube, so I moved it there too. The result - another 10 mm back... 169 mm from the leading edge. Still a little nose heavy if we're judging by the wing tube.

In the process I removed the landing gear reinforcement and standoffs (I may reinstall it if I think it's warranted), the BatShare, and the mounting plate, hardware and straps that held the receiver battery to the motor box, for a total savings of 210 g (nearly half a pound).
We'll see how it goes at the next flight. If it's too much I'll move the receiver battery forward and try again.

Originally Posted by Dale Hunter

Depends on weather you can fly inverted.
(joke, John)



Yes, as Joe say's. It's your hobby, set it up for your flying tastes. Trimming tools are just that, ways to gauge where you are. And, what you can try next to obtain your desired flight characteristics.

Best of all, fly. The more the merrier.
Just got home, heard my friend is out trying his new radio. Might have to join him. Yard tasks can be done in the wind.
(Add, Arlene is out running errands. No policing!)

-Dale-

Originally Posted by VA6WGO

It will drop, if it doesn't drop you are going to induce some other problems when flying up right. For IMAC or precision aerobatics, the plane is a bit in the nose heavy side. It helps with the snaps and tracking.

Have you looked into white rose engineering? I got a couple of their weight washers for a 35 & 40% a few years ago. I got different sizes and it helped me a lot to determine the sweet spot on the CG of that airplane. I think you can ask them to make you a couple of those (different weights for a 50cc size) You would need longer prop bolts though.

http://whiteroseeng.com/products/pw.html


Will

Originally Posted by grosbeak

When testing the CG, is it a good idea to fly inverted to see if the nose drops?

Originally Posted by grosbeak

When testing the CG, is it a good idea to fly inverted to see if the nose drops?

Originally Posted by JoeT

It's more important for you to "Like" the way the plane flies, rather than searching for the perfect CG. IMHO.