Hi All


I have build A Wild Hare SUKHOI TOC-3mm 53cc .I think that I having problem On the CG. Does any one have the exact GC for SUKHOI 87.i am having problem on hover and when turning left? [/size]

If you still have it set up with a 3mm engine, a 4800/5200 lion on the engine box, and a 2400 lion behind the firewall the plane is too nose heavy. Go to the Wild Hare website and read the instructions for the Sukhoi. If you balance the plane so that is sits level when supported under the forward edge of the wing tube it will fly much better. The farthest aft it should be balanced would be at the aft edge of the wing tube. You can do this mathmatically or the easy way by simply placing your fingers under the wing at the wing tube and lifting the plane. If it sits level with your fingers placed anywhere from the center of the wing tube to the forward edge of the wing tube you will be good to go. Based upon how you stated the plane was set up elsewhere your plane curently probably balances near the leading egde of the wing.

I've covered this for you in another forum as well.

when i set the plane as the folowing . 5600 battery on the Engine box and 2600 near the Fule thank. i have CG teplane from the wing tube and it''s littel noas douwne but im haven problem when im pulling full up it taks left and it''s snap when tacking left tarenor rigth tarne

how i know the plane nose or thail havy when flaying the plane

You just told yourself that the plane is nose heavy. It''s nose down when supported at the middle of the wing tube. Nose down-nose heavy. The wing tube is the fulcrum that establishes the balance point. Plane level when supported at the tube, or under the forward edge of the tube=cg ok. Now you can easily find the measurement for those locations by simply measuring from the trailing edge of the wing against the fuselage, pulling the tape measure forward to the front edge of the wing tube. That distance will be your cg measurement.

You installed every heavy component that the plane has in the fuselage forward of the of the gas tank. If you have the rudder servo mounted inside the fuselage the problem is even worse. I set mine up with a 3mm 53. Doing so required that the ignition battery, a 2,400 mAh li-on, be mounted on the shelf just under and behind the wing tube. The flight battery, a 5200 mAh li-on, had to mounted on the shelf with the receiver, aft of the ignition battery. The rudder servo had to mounted in the tail.

If that''s what it took to balance mine, there''s no way your plane can be anything but VERY nose heavy. That''s why you are having problems flying it. Nose heavy planes do not hover, they don''t harrier, they land too fast, and are snappy. Every time!!! Correctly balanced planes do not generally have those issues.

I may not be telling you what you want to hear, but I am telling you what you need to know. How you correct your cg issue is up to you, but it will require that you move some of the componenets to locations that will relocate the cg to the correct location.

i have change the CG in the field the 2600 lip from next to the fuel tank to back of it and it was tail have


how can i know if the nose Or tail have when flaing the plane plz

Climb at 45* roll inverted, then let go of the sticks. The plane should slowly arc down toward the ground inverted, if it flies straight or climbs it''s tail heavy.

Roll inverted. If the model requires a lot of down elevator to remain level it''s nose heavy. If the model pitches up it''s tail heavy. The model should requie a very small amount of down elevator to hold level flight when inverted.

Another method.

Roll the model into a nearly vertically banked turn. If the nose drops it''s nose heavy. If the nose rises it''s tail heavy. This presumes you can roll into a steep bank and stay off the the controls for a moment.

Another method:

Pull into a hover. If the model always falls to the belly or the hatch and not to the sides it''s nose heavy.

Another method:

On short approach at lower power settings if the model continues forward nose high without operator input it''s tail heavy. If the plane continues forward nose down and descending quickly it''s nose heavy. If the plane requires a lot of speed to make a stable approach without snapping to one side it''s nose heavy.

Another method:

If the plane requires a lot of up trim for level flight it''s nose heavy. If it requires a lot of down trim it''s tail heavy. The amount of trim and it''s direction is always a good indicator of cg position.

I use all of them together to check the cg. After the cg is established go on to other trim checks. Perform no mixing until the desired cg is established. Same with engine thrust angle modifications. Wait for the cg to be done. Of course you should correct any roll trim issues on the first flight to make the flight safer.

Pat Roy.............................. Thank's for the CG method One more Q?

what prop do you use on the SUkoi ?? I use VeSs 22 A I think that ill chang it to 23x8 Or 24x8

This will create quite a stink but I recently tried a Vess 22-A and didn't like it at all on a Taurus 52. What I did finally get around to trying was an NX 22-8 that really surprised me. It out performed a Menz 22-8!! Si if you can get them either an NX 22 or 23-8. AirWild is the primary distributor.

I know your country to some extent and understand just how hot it can get. You want a prop that will spin up in the hot, less dense air so something like the NX or even a Mejzlik or PT carbon props could help you.

Where in Kuwait are you?

kuwait City

Then it's possible we might have an opportunity to get together sometime. Next time I'm out your way I'll send you a note.