So, I assume that you have a Twist and have it built and flown.
I'm just finishing mine up but am having a real problem getting it balanced. It needed 8.2 oz ahead of the firewall to get CG at 4". I have 5 in and need 3+ more and don't know what to do.
Did you have this problem?
Using 46 FX.

I have thunder Tiger Pro . 46 on the front, I had to added 8 to 9 OZ weight and battery to the front to get the CG little past 4" behind the leading edge. I'm going to try to fly her tomorrow.


Chris

If you have to add the weight you my as well use NiMH battery's they are heavy and last 2-3 time's as long as regular battery's...the ones I use are 4.8v@2000mAh and weigh a porky 135 grams or 4.8oz's run 2 of them and you can charge then on Sunday and fly all week....these are what I'm installing in mine.....but I don't need as much weight because I'm running a YS63S.....you can see them @ tower hobby's ...part # HCAM6320........JW

Guys, try getting your CG back to around 4 1/2" or 4 3/4" and also try a DU-BRO or Great planes Heavy hub spinner. When you can move your weight all the way out to the end of the crank you will not need near as much on the fire wall or cheeks. After I had installed the engine with the recommended distance from fire wall the thrust washer I noticed I could have came out another 1/2" on the mounts that would have kept me from needing as much stick on weights(2oz). Also, when adding weight, don't do like me and stick the lead in the way of your low speed screw(os46ax). Only problem I'm having is when I roll with high rates, its so quick my engine stalls. Checked my tank and lines, all ok. Its almost like I'm slinging the fuel out of the engine when I roll it hard. With good weather Wed. I'll fly and tune it better to see if I can correct this problem.

WOW,....... I put a pro 46 on mine and only had to add 2 oz. to get the CG in the middle of the range.
Ron

I have standard servos all around. JR 4735, I moved the engine 1/2 inch forward and used a 700 nicad. CG came out right at 5 inches back were I wanted it. No extra weight added.

Actually I am looking to get this plane. I have a ucd 60 that won't harrier except at high alpha. I would like a plane that will knife edge well w/o a lot of coupling and harrier/harrier land w/o a lot of wing rock. Harrier at like at a 45 degree attitude going horizontal w/o a ton of wing rock. Finally found a buyer for my old trainer and am thinking of getting this with a saito 72. I usually go on the high side of the engine and then move the battery around to get the cg where I want it.

Have you tried to move the tank on the cg and the batter in the fuse? Is that possible?

Also.. I would not put a heavy spinner on. That will make it harder for your engine to speed up the prop and slow it down.

Does anybody know if there is a purpose for...well, I don't know what you call it. Possibly "counterbalanced" elevator and rudder. It's where the sides of the surface span the elevator and stabilizer. The Twist has them, but something like a su-do-khoi doesn't .

I'm still trying to figure out why horizon says you can do high speed runs with this plane, it just doesn't seem plausable without blowing somthing off it eventually.

kevin

I flew mine yesterday again. Super easy to hover. My Magnum XLS .52 is running great now. Pulls like hell. It flatspins flatter than any other plane I have ever seen.

With my O.S. 70 4-stroke I can do full throttle runs with the 13-8 prop no problem. It can move along pretty fast. I don't know about a dive at full throttle though. If you had a high revving 2-stroke it might be too fast, I don't know.

Mike were is your CG. I can't get mine to flat spin at all. I am at 5.

I believe it was 4 1/2". I haven't tried to flat spin it so I don't know if it will or not.

Mine is at 5 to 5.25. I am not using spoilers or flaperons. High rates. I wont hold it if you use too much right airleron. 1/4 throttle than start adding more throttle once it is in the spin.

Oh, the other Mike.

The one I am testing wouldn't flat spin until I increased the elevator throw to 45 degrees or greater. 30 degrees wouldn't get me anything. At 45, it flat spins upright and inverted, does a nice blender and a great waterfall or forward flip. Lots of wing rock in a harrier or elevator.

My balance is somewhere toward the rear of the range as I pick it up with a thumb and finger. Power is an OS AX with a heavy hub. I'll try it without the hub next weekend.

I finally got mine to flat spin, but it is not real flat. It is more like 60 degrees. It stops instantly when you center the sticks. I can go farther back with the CG. And you are right Mike, you can use too much aileron. I am also lacking in elv throw. Around 32 or so. I will fix that and see what happens.

I am not sure how much elevator throw I have but it is to the max

Here are some pics

That is more than I have. I will change it tonight. Thanks.

No Problem. Let us know if she will flat spin at 4 1/2.

Anyone have any pictures of a Saito .72 engine installed? I am having a problem getting the throttle linkage to route to the engine without binding.

Thanks

Lefty
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Glad I'm not the only one to notice the coupling issue.

I FINALLY got to fly my twist yesterday. Put 5 flights on it. It is set up with an abused OS 50sx turning an APX 11x7. These were the engines first flights after getting planted a foot deep in mud last year during the demise of my Somthin' Extra. The engine wasn't quite putting out the power it used to, but some adjusting will get it close, I just didn't feel like doing that yesterday because I wanted to FLY!

ANYWAY...the balance was set to the middle of the recommended range (4 1/2"). In my opinion, this is WAY nose heavy. It flew straight and level with no trim needed. Inverted flight required holding some elevator to maintain level. Applying rudder, in either direction, resulted in a severe nose pitching toward the gear.

I tried to get the thing into a flat spin, but it just wouldn't do it, on either low or high rates. In fact, this part of why I think it very nose heavy with the balance in the middle of the range...since the spins were basically almost straight down nose attitude.

I will move the balance back and see what happens.

I think it will likely hover nicely, but I had some trouble last night due to engine power (remember the mud?) and the coupling issue. It did, however, harrier nicely!

I think it will make a nice funfly plane, but so far I think I like the Sig SE better...time will tell.

The Twist is awesome, but u just can't challenge a Funtana.

How do you guys think an Evolution .61 would work on this plane?

Thanks,
Greg