As the title states, I've got a few little 'Tiny' problems. I have a scratchbuilt Tiny that is ailerons/elevator/throttle. It is powered by a Dual-IPS and a 7 cell 370 mah 2/3 AAA pack. It is pretty hefty at 7 3/8 oz AUW. 10 x 7 APC prop.

The first flight after I 'ressurected' it and put some landing gear on it was a struggle. The flight was short, but the main problem was pitch. I had to hold up so that it would fly level, and it flew with a 'nose up' attitude, but didn't climb well. The made it slow and 'tippy.'

Next flight, I moved the CG back from the spar to 1/4" behind it. It is better, but I can't effectively gain altitude. It will roll in heartbeat, so the ailerons work well, but pitch is a big problem. With the new CG it has less of a 'nose up' attitude, but still refuses to gain altitude. It also got faster with the new CG, but this was expected because of the high wingloading.

It seems as though I am kept on my toes trying to get it to fly well. I want to be able to let go of the stick, and let it fly where I pointed it, rather than it dropping like a rock if I don't hold the nose up. At this extreme I can't trim the 'up' because it'll slow too much and stall.

Any suggestions to get it flying well?

~Chris

Sounds like your still nose heavy. Are the wheels ahead of the CG?

A remote possibility is that the wheels are adding drag, and pulling the nose down. That's extreme though.

It also sounds like you're pulling more current than those little NiMhs can deliver. They're not much good above about 2-3A. You don't say what gear ratio your IPS-D is but I'll bet you're propped for rather more than 3A.......

It sounds very nose heavy to me. If you roll the airplane inverted and the nose drops really quick. That tells you if it is nose heavy.

I think BEC is right. You are probably pulling 3 to 4A and there is no way those batteries will deliver.
boomer
www.boomerseflight.com

Hm, batteries eh? Thanks for all the suggestions everyone. I think it is still nose heavy. Also, the wheels are CAed in front of the wing, but they are slim foam ones.

I may be drawing too much for the batteries. I should take it down to a 9x7 or less. I probably shouldn't tell you this, but . . .

I used to fly by GWS BN-2 and GWS E-Starter with these batteries! If I could easily fly the E-Starter with the EPS-300, then I imagine it'll fly the Tiny. However, I do realize they are very different planes, and shouldn't count on that.

I'm going to try it with the CG further back.

~Chris

Once again- thanks everyone.

Originally posted by Chris Stevenson
Hm, batteries eh? Thanks for all the suggestions everyone. I think it is still nose heavy. Also, the wheels are CAed in front of the wing, but they are slim foam ones.

I may be drawing too much for the batteries. I should take it down to a 9x7 or less. I probably shouldn't tell you this, but . . .

I used to fly by GWS BN-2 and GWS E-Starter with these batteries! If I could easily fly the E-Starter with the EPS-300, then I imagine it'll fly the Tiny. However, I do realize they are very different planes, and shouldn't count on that.

I'm going to try it with the CG further back.

~Chris

Once again- thanks everyone.

Chris,
You will NEVER be happy trying to fly a 300 powered plane with those wimpy cells. Bite the bullet and get you some 7 cell KAN packs they are as cheap as $14 a pack from www.cheapbatterypacks.com
boomer

The thing was, I was getting as good duration as the 7 cell 720 mah pack I had, because it would just float forever. Also, I was happy with it because I was just getting started in R/C flight. It was quite a rush.

Now I borrow some of my dad's batteries. He has a ton of 8 cell 720's, and a bunch of other misc. packs.

cheapbatterypacks.com - - bookmarked.

~Chris