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Post by phales15 on May 11, 2009 2:02:45 GMT 1
Hey everyone,
I crashed my super cub earlier today and noticed after the crash that the engine firewall had cracked. I tried to super glue it together, but this caused my propeller to mount at an angle. Therefore, when I went to fly my plane I had zero control, it was all over the place, and it crashed. I reglued the gearbox to the firewall, thought I had everything straight, but still had zero control of the plane. Also, I seemed to be able to generate zero lift. I couldnt lift my plane up into the sky like i used to. I also had a problem with my rudder being slighty tilted to one side, depsite trimming. I move the rod through another hole, which helped, but now my servos are making a funny noise. is this something I should be worried about? Also, what is causing my plane to fly out of control? does it sound like a firewall/engine mounting issue? if so, How do i ago about fixing this, thanks!
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Post by ginginho on May 11, 2009 13:05:22 GMT 1
Hello,
Shame to hear of your woes, I'll try to answer each point below. The tests suggested require a freshly charged battery.
Firewall/Motor Mount : Be aware that the prop should be mounted with a small amount of angle on it. This is called the thrust angle.
If you have a spare prop, put that on as you probably have damaged the one fitted during the crash.
Your motor mount shouldn't need to be glued to the firewall, there are four screws that attached this. I'd suggest taking the cowl off, refitting the prop, and observing what is happening when you power up the motor. Check whether the motor mount is pulling from the firewall or if the firewall is pulling from the airframe. Also check that you haven't bent the prop shaft, either from observing if you have a wobble on the prop under power, or spinning it with your finger for the same. Another check for this is to see if it binds when span with your finger.
Lack of Control : Have you checked that your control surfaces all move smoothly on the ground? This is called a pre-flight check, and should be performed prior to any flight, as a must if you've attempted to gain a negative altitude. Make sure that both you rudder and elevator are aligned correctly (as per the build guide that came with the plane).
You can adjust your rudder by removing the clevis from the control horn and turning the clevis on the control rod.
Zero lift : This is either lack of power (as checked above) or your wing is either damaged or not in the correct place.
Servo Noise : Hmm, it could be something to worry about, it may be that you have a bind somewhere causing the servo to be overloaded, or it may be trying to drive beyond it's maximum travel, you'll have to describe in better detail what you are seeing and hearing.
I don't think zero control is related to your motor/firewall problem. If your control surfaces work to stick movement, you have power when the throttle is applied and the wing is not broken, there is no reason why it shouldn't fly.
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Post by gagallagher04401 on May 11, 2009 16:54:19 GMT 1
Also sure you put your prop on the correct way, I had mine on backwards and I had to fight to fly/control the plane did not want to lift off either), then I flipped it around and all was good.
George
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Post by phales15 on May 11, 2009 17:30:09 GMT 1
ok, i think possible the prob was it. I think I had the the side with the bolt glued iside the propellar facing in towards the plane. If that makes sense. Does that seem correct?
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Post by gagallagher04401 on May 11, 2009 19:47:39 GMT 1
umm.. not sure if I understand your wording. The side with the hex shape will go towards the plane and the nut on the shaft will go into that hex shape, then put on your washer and the other nut to secure the prop in place. Is that how your prop was installed? Some props have writing on them (size of prop, brand of prop etc..) that will face "out" from the plane, so you could read the words while looking at the front of the plane. I hope I am making sense LOL  Hange in there we'll get you sorted out George |
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belem
Squadron leader
Posts: 210
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Post by belem on May 11, 2009 22:24:09 GMT 1
Sounds like he removed the hex nut that the prop sits on when he took off the prop, then replaced it backwards.
That WILL tend to cause problems.
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Post by phales15 on May 12, 2009 16:17:32 GMT 1
thanks everyone,
by watching a video on youtube, I realized I had the prop on backwards:( man, will that make controlling the plane near impossible.
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Post by gagallagher04401 on May 12, 2009 16:36:03 GMT 1
Glad you got it sorted out! It always seems to be the little over looked item that can cause the biggest problems. George |
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