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Cub
I purchased a used Hanger 9 cub with a 80"wing off a friend of mine who got frustrated because he couldn't take it off. Everytime he gave it power it would turn violently to the left. I should have known better, because he is an experienced pilot. I am having the same trouble. The motor had left thrust in the engine from the factory, so we put 2 washers under the left side to give it a little right thrust like it should have had to start with and I am still having trouble. Any ideas or techniques from you cub flyers?? I know there is already a few threads about this but I thought maybe someone had come up with the magic solution. I have a friend that had no trouble on the take off twice. I don't have those skills evidently.
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RE: Cub
How are you applying power to take-off? The way I would take-off with my Cubs (full-size as well :) ):
o Full up elevator o Right rudder o Apply power slowly until some speed is built o Slowly let off the up elevator as speed builds o Keep right rudder as needed for wind and tork (P-Factor) o Lift her off the ground when the tail is flying and rotation speed is acheived Hope this helps. |
RE: Cub
Thanks Shadow... I'll give it a try.
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RE: Cub
i agree with shadow but with out the full up elevator get that tail flying first thing and it will help alot
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RE: Cub
Without the downward pressure on the tail with up elevator, the tailwheel will not have enough pressure on it to be effective.
I wanted to put some "teeth" in this by a demo. Notice the elevator in Jim Deitrich's 50% scale Spacewalker while taxiing and when he starts the take-off roll. He holds up elevator while taxiing to keep pressure on the tailwheel. The same applies when he starts his take-off roll. http://www.youtube.com/watch?v=5ZAXarCvVoE Beautiful plane too :D |
RE: Cub
I've often used the 'blast' method with success.....line it up and give it a quick blast - the tail will come up quickly and then throttle back to 1/4 throttle and continue with a straight take-off.....did that with a full scale also.
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RE: Cub
ORIGINAL: RCShadow How are you applying power to take-off? The way I would take-off with my Cubs (full-size as well :) ): o Full up elevator o Right rudder o Apply power slowly until some speed is built o Slowly let off the up elevator as speed builds o Keep right rudder as needed for wind and tork (P-Factor) o Lift her off the ground when the tail is flying and rotation speed is acheived Hope this helps. |
RE: Cub
Wow Tailskid...wow...I expected more from a once magazine contributor lol. Kidding by the way.
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RE: Cub
Ha Ha...you have to try it - it works!!!
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RE: Cub
ORIGINAL: tailskid Ha Ha...you have to try it - it works!!! |
RE: Cub
and what about the 'knot' in your antenna wire thread :)
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RE: Cub
I'm with RCShadow. Full up at all times when taxiing and as you begin the takeoff roll. It also prevents the sudden application of power from causing a nose-over!
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RE: Cub
ORIGINAL: tailskid and what about the 'knot' in your antenna wire thread :) ORIGINAL: MinnFlyer I'm with RCShadow. Full up at all times when taxiing and as you begin the takeoff roll. It also prevents the sudden application of power from causing a nose-over! |
RE: Cub
Two Cents from an old Builder/RC Flyer, Bend the Landing gear to have abour 2 degrees "TOE-IN", you know, point the wheels towards the NOSE slightly. This "TOE-IN" will help in ground handling and take-offs.
Than start you Take-Off from the grass. If you want to make better landings, Line the model up on your shoulder, make your normal approach, as the model gets down to about two (2) feet from the ground, FOCUS your eyes to the MAIN WHEELS, Watch the Main Wheels and feed in elevator for a perfect Landing. Same is true on Tri-Gear, Focus on the Main Wheels. If you just watch the whole airplane, you will hit on the NOSE Gear almost every time. Happy Take-offs, and Landings. Ken AMA 1528[/size]. |
RE: Cub
ORIGINAL: Ken Kehlet Two Cents from an old Builder/RC Flyer, Bend the Landing gear to have abour 2 degrees ''TOE-IN'', you know, point the wheels towards the NOSE slightly. This ''TOE-IN'' will help in ground handling and take-offs. Than start you Take-Off from the grass. If you want to make better landings, Line the model up on your shoulder, make your normal approach, as the model gets down to about two (2) feet from the ground, FOCUS your eyes to the MAIN WHEELS, Watch the Main Wheels and feed in elevator for a perfect Landing. Same is true on Tri-Gear, Focus on the Main Wheels. If you just watch the whole airplane, you will hit on the NOSE Gear almost every time. Happy Take-offs, and Landings. Ken AMA 1528[/size]. |
RE: Cub
I suspect that you are punching the throttle to quickly. Ease in to the roll, take your time gaining ground speed, let the tail come up then a little added elevator and you will be flying. You might have to add just a tad of right rudder during the roll out.
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RE: Cub
"The Shadow knows..." RCShadow is right.
I agree it sounds like the throttle is being advanced too quickly. Is it a 4-stroke? Most of mine have a non-linear throttle response, getting 90% throttle before half-stick. May have to change throttle linkage or use expo. That Cub should take off at half-throttle with a good motor. |
RE: Cub
quote: ORIGINAL: Ken Kehlet Two Cents from an old Builder/RC Flyer, Bend the Landing gear to have abour 2 degrees ''TOE-IN'', you know, point the wheels towards the NOSE slightly. This ''TOE-IN'' will help in ground handling and take-offs. Than start you Take-Off from the grass. If you want to make better landings, Line the model up on your shoulder, make your normal approach, as the model gets down to about two (2) feet from the ground, FOCUS your eyes to the MAIN WHEELS, Watch the Main Wheels and feed in elevator for a perfect Landing. Same is true on Tri-Gear, Focus on the Main Wheels. If you just watch the whole airplane, you will hit on the NOSE Gear almost every time. Happy Take-offs, and Landings. Ken AMA 1528[/size]. All good stuff Ken and I couldn't agree more. Thank you! FB |
RE: Cub
I have two Cubs, a 1/4 scale Balsa USA and a Goldberg. I agree with the sugestion of toeing in the landing gear as viewed from above. It works, with and without varying throttle control, and I fly off pavement. You can also add a heading hold gyro and switch it off as you leave the ground. My buddy couldn't get his Great Planes Cub to behave, so he added the gyro and it solved the problem. Make sure you are able to control it from your Tx or you will encounter some other problems.
Bob |
RE: Cub
Finally someone who knows about ground handling
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RE: Cub
If you want to look like a real pro...put your aileron stick into the prevailing wind (if a cross-wind component exists). Slowly ease off the aileron stick the same as the elevator. What this does in full-scale is, it keeps the wings level as the cross-wind tries to lift the wing on the wind side as airspeed builds thus stopping any ground loop or flip-over. The same applies to RC only to a lesser extent, hence why RC guys don't use it often unless they have a big bird and have learned the hard way [X(]
I know in full-scale, if you do not use this method, the FAA check-ride pilot will fail you immediately and take the controls and scold you AND your instructor for improper procedures. |
RE: Cub
This also adds a little adverse yaw in your favor.
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RE: Cub
ORIGINAL: cfircav8r This also adds a little adverse yaw in your favor. |
RE: Cub
I've never been in a full scale cub, thats definitely something to add to my "bucket list".
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RE: Cub
Thanks gentlemen, Lots of great ideas to try. I have several planes and I don't have any trouble taking them off. This one is a real bugger. I especially like the toe in idea... gonna definitively do that. I am flying tomorrow. We'll see what happens.
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