Kangaroo CG
 

I ballanced the Kangaroo at 95mm and there is no wieght on the nose gear. Just the slightest bump ans it is sitting on the rudders.... The gear is only ~1/2" behind the CG so this makes for a very delicate ballance. I moved the CG forward ~ an inch and it was fine.... Is this just me or did everyone have this problem ???

What can be done to stop the "Kangaroo Hop" ??? It seems like a good way for a plane to self destruct.

RE: Kangaroo CG
 

That's normal. If you are uncomfortable with it, move the cg forward a little. All of the fuel in a Roo is in front of the cg, so any residual is going to put the cg forward of the 95 mm. You really want to avoid the hop, and it is quite easy. Let the plane settle on its own. If you have full back stick when it settles in, it will not hop.

RE: Kangaroo CG
 

Bill is 100% correct....!

Todd

RE: Kangaroo CG
 

Hey Todd,

What's up bud?
Give me some suggestions on throws for the Roo.....Im Just about ready for blast off!!![sm=biggrin.gif]

Get the firetrucks ready!!!!

Joey.

RE: Kangaroo CG
 

Joey.....Wasssssup bud!

Go with the manual for first flights, they are fine to start with. Just make sure you have about 1/4" reflex (up elevator) and set your expo on elevator and aileron to about 25-30%. Seperate nose gear steering from rudder channel (nose gear on ch 4) an set low rate for steering to about 25% (no need for low rates on rudders), cut to low rate for takeoff run, go back to high for landing. Questions? Good luck with the maiden joey ;)
Remember....Range check, range check, range check!!!!

Todd

RE: Kangaroo CG
 

my book said 100 mm ahead of the leading edge of the wing tube, it balance at almost 5 not 4 inches and flew fine just need a bit more up trim.. landin hold the flare hold it off and sloww it down once the mains touch HOLD the nose off with elevator...untill it settles down on it own. the bounce is a from comming in to hot (fast)