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SIG Cabinaire by LASTWOODSMAN. Viewed 350 times.
Build Thread
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| Image Comments |
| LASTWOODSMAN | 30-May-17 21:57 | | Next flight, I have a powerful motor - 4 loops of 1/8" rubber 12 " long ... The last time I flew it, I had two tabs on the elevator and one on the rudder - it accelerated fast with so much power in the tightest circle, I had to duck my head at the last second as it screamed by just missing me !! - and crashed ... |
| bsadonkill | 31-May-17 13:39 | | My guess is you are using the kit prop? That would be 7 1/2 inch plastic? 8 strands of 1/8 inch is a lot for a prop that size. |
| LASTWOODSMAN | 31-May-17 14:29 | | Donkill - I meant to say 4 strands of 1/8" rubber - one long length of 48", folded over on itself for one loop of two 24" lengths, then tied off in a knot, then folded over again for a hook to peg length of 12" ( = 4 strands of 12" length each), and the prop is a 7" Peck made in Japan. I definitely will not give it 360 winds to start again !! I only broke off one landing gear strut - all repaired and ready to try again - hopefully no wind next time. |
| mlriley540 | 31-May-17 21:35 | | That should be enough motor, and the prop I think is right for the motor and plane. Once you get your trim right so it climbs somewhat steady, the plane should handle 600 turns. The risk of a horrible crash does go up a lot as you add turns to the motor. My peanut scale Mustang flies fine with 500 turns. |
| bsadonkill | 31-May-17 21:49 | | You could try using some shim stock on the nose plug,like 1/32 bass wood to give it more thrust to the opposite of the turn. |
| LASTWOODSMAN | 31-May-17 22:55 | | Thanks for the tips gentlemen - I took off the kit-supplied 7" Sig "High Torque" red prop with the rectangular shaped blades, and put on the 7" gray Regular(?) Peck prop with the oval shaped blades, just to match the color scheme LOL - is there a big difference between the two props? I have a shim for "down thrust" that I smeared up with CA glue to harden it, and the noseblock and front fuse firewall, but no "side thrust" shim yet. I have read that you should have "down thrust" and "right thrust" shims of 3 degrees each. This "high wing" model is supposed to turn right, I think, under power. I also have positive(?) incidence (decalage?) on the stab (rear of stab is higher than front of stab to fuse centerline). I will be more careful on the next windless day ... |
| mlriley540 | 31-May-17 23:03 | | I would do some glide testing in your yard out of the wind. Before you trim it for flying under power, it's good to get it to glide nice. Once it glides how you want, it's easier to trim for flight. |
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