I'm finishing my Roo 2, everybody was saying that it tend to came nose heavy. I'm using a Wren MW54 with wand starter so no starter on the nose of the engine. I've got the tray set about standard ( air valves, stearing, air brakes, retract servos, receiver) CG should be 100mm in front of the edge of the wing tube.

I'm using Robart 630 gears

I putted 2x 6v 1100mah nicad batts on the box already made for that at the end of the fuse. So i have to put the upper tank ( 4oz paper clunk) and the 3cells 1100mah nicad (pump batts)on the nose retract former to achieve the cg point. Is it normal??

When the Roo sits on his wheels, it's very easy to raise the nose(very little effort). is it normal???

Helo.

I have built 18 Roo's so far. I have installed everything the way you discribed it, and had no trouble at all getting the CG right. The last Roo was powered by a SimJet 1200, and I got the CG right from the beginning. I have also built Roo's with a SimJet 3000 (Heavier engine) And all I had to do, was to place one receiver battery in the nose, in order to get the CG right.

It is normal that it takes little effort to raise the nose. Actually, with empty tanks, you should be able to leave the plane on its main wheels and the tail.

Happy flying.

Good!!! So i'm ok! Thx alot

CG 100mm in front of the leading edge of the spar

humm, maybe my english is no good. I'm copying the instruction :

The center of gravity of the model should be located about 95-100mm forward of the front leading edge of the wing tube joiner

Is this mean the same as i said ??? If not correct me please.

Yes, you are correct

Mark

Glorfindel,
Im currently flying a Roo with a Wren 54. I have the CG set at 100 mm in front of the wing tube. If I bump the plane with the canopy off, it will fall to the tail but other than that it flies great!

Good luck!
Joey.

Thx! So my setup is ok