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Old Jun 17, 2012, 12:53 AM
I will do it all eventually
aeronb's Avatar
United States, OR, North Plains
Joined May 2012
62 Posts
OK, can't help it. I've been reading and reading through this thread for hours now. I still have not found any solutions to my problem.

I have an e-flight power 10 in my Fun Cub with an 11/5.5 acp prop. Once I get to around 60% throttle, I get a violent vibration that shakes my prop adaptor loose. I've had this bird up once only by running up at mid throttle to avoid the vibration issue. Just a quick flight to see that it would actually fly at all.

I have never flown a plane before today. I did not balance the prop at all. I tried both of the props that I bought when I bought the plane with no apparent difference with regards to the vibration issue. Is balancing the prop the answer to my woes? How is it done?
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Old Jun 17, 2012, 01:46 AM
cheapskate extroardinairé
United States, CA, Marin
Joined Jul 2011
1,091 Posts
Quote:
Originally Posted by aeronb View Post
OK, can't help it. I've been reading and reading through this thread for hours now. I still have not found any solutions to my problem.

I have an e-flight power 10 in my Fun Cub with an 11/5.5 acp prop. Once I get to around 60% throttle, I get a violent vibration that shakes my prop adaptor loose. I've had this bird up once only by running up at mid throttle to avoid the vibration issue. Just a quick flight to see that it would actually fly at all.

I have never flown a plane before today. I did not balance the prop at all. I tried both of the props that I bought when I bought the plane with no apparent difference with regards to the vibration issue. Is balancing the prop the answer to my woes? How is it done?
ideally, get a prop balancer and put small pieces of tape on the light blade. also, check that you have a very secure motor mount.
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Old Jun 17, 2012, 02:08 AM
cheapskate extroardinairé
United States, CA, Marin
Joined Jul 2011
1,091 Posts
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Originally Posted by cubcrafter60 View Post
Ahhhh what the heck! Here's a couple of examples to wet your appetite!
i think red on grey would look AMAZING
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Old Jun 17, 2012, 02:50 AM
Registered User
Australia, QLD, Brisbane
Joined May 2012
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Originally Posted by mutha View Post
Yep ...

On the first video ... also wonder if maybe not enough down thrust as well as it was trying to baloon a bit on throttle. (The combination of tail heavy, low airspeed and lack of down thrust is one that will most often end in tears.)
what is meant by "lack of downthrust" is that the motor mount position or lack of elevator?

Thanks
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Old Jun 17, 2012, 03:40 AM
Registered User
Australia, QLD, Brisbane
Joined May 2012
97 Posts
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Originally Posted by EFlapper View Post
The 54 amp size is not a problem, but the BEC of the Thunderbird might be. If you use more than 4 servos, you need a switching BEC with 4 or 5 amps to be on the safe side. The 3 amp BEC of the Thunderbird is not a switching BEC

Dick
But the servos on the funcub are only small aren't they? Based on your recommendation I bought a ubec @ 5A & 5-5.55 volts just to be safe.
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Old Jun 17, 2012, 03:41 AM
cheapskate extroardinairé
United States, CA, Marin
Joined Jul 2011
1,091 Posts
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Originally Posted by Matt_flyer View Post
what is meant by "lack of downthrust" is that the motor mount position or lack of elevator?

Thanks
motor mount angle
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Old Jun 17, 2012, 03:44 AM
Registered User
Australia, QLD, Brisbane
Joined May 2012
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Originally Posted by baconflyer View Post
motor mount angle
thank you.

Man theirs some nice paint jobs on these planes! Inspiring.
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Old Jun 17, 2012, 03:46 AM
cheapskate extroardinairé
United States, CA, Marin
Joined Jul 2011
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Originally Posted by Matt_flyer View Post
thank you.

Man theirs some nice paint jobs on these planes! Inspiring.
i just realised something: someone else is on rcgroups at 12:45 other than me. WOO! I'M NORMAL!
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Old Jun 17, 2012, 05:46 AM
Registered User
Australia, QLD, Brisbane
Joined May 2012
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Originally Posted by baconflyer View Post
i just realised something: someone else is on rcgroups at 12:45 other than me. WOO! I'M NORMAL!
I'm from Australia, does that make you normal?
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Old Jun 17, 2012, 08:01 AM
An unexpected error occurred
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Belgium, Flemish Region, Duffel
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I just made a very simple modification to the landing gear, and it works perfectly on our grass field.
My first attempt wasn't a success, because the spring I used was too stiff. This resulted in too much bouncing when landing, and what is worse, once it pulled the gear legs together so much, that the wire came out of its plastic holder. The right wheel hit the propeller, which cut a piece out of it. Just glued it back in, and I was good to go again (without the spring for that time).
This spring is much softer, and it works wonderfully.
The little hooks are attached to the gear wire with a very light wire ran around it, finished with a bit of epoxy.
Thanks to my neighbour across the street for the spring :-)
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Old Jun 17, 2012, 08:21 AM
What's up with that?
cubcrafter60's Avatar
United States, CA, Clearlake Oaks
Joined Jul 2011
1,784 Posts
baconflyer - It's 4:30 where are you??? I probably check this thread 4 - 6 times a day to see what's up. If I spent the time fixing my FunCub that I spend on here, I'd probably be getting ready to fly right now!

All - There have been some really nice FunCub's on these pages! I just wanted to get some thoughts on an idea (yes/no). I was thinking of starting a sister thread showcasing finished FunCubs - not just custom painted FunCubs but stickered one's as well, A place where YOU can show off your pride & joy! I thought maybe a simple format for entries like:
A brief explanation of how your plane is equipped, modified, and special features.
A brief recap of finishing techniques used to complete the model (brand of paint, tape, etc. if they worked well)
And finally 4 -6 photo's of your FunCub (preferably with at least one in flight).

I don't want to take anything away from this thread, I thought if someone wanted to look at finished FunCubs for inspiration or Ideas or to show off their hard work, it would be a place where they could do just that! ~ Please let me know what you think. If the response is favorable I'll start it this evening if not I'll nix the idea. Thanks! ~ Robin
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Old Jun 17, 2012, 08:27 AM
The figure "9" Specialist
aeronca's Avatar
A Barrier Island in New Jersey, USA
Joined Oct 2003
3,501 Posts
Quote:
Originally Posted by cubcrafter60 View Post
baconflyer - It's 4:30 where are you??? I probably check this thread 4 - 6 times a day to see what's up. If I spent the time fixing my FunCub that I spend on here, I'd probably be getting ready to fly right now!

All - There have been some really nice FunCub's on these pages! I just wanted to get some thoughts on an idea (yes/no). I was thinking of starting a sister thread showcasing finished FunCubs - not just custom painted FunCubs but stickered one's as well, A place where YOU can show off your pride & joy! I thought maybe a simple format for entries like:
A brief explanation of how your plane is equipped, modified, and special features.
A brief recap of finishing techniques used to complete the model (brand of paint, tape, etc. if they worked well)
And finally 4 -6 photo's of your FunCub (preferably with at least one in flight).

I don't want to take anything away from this thread, I thought if someone wanted to look at finished FunCubs for inspiration or Ideas or to show off their hard work, it would be a place where they could do just that! ~ Please let me know what you think. If the response is favorable I'll start it this evening if not I'll nix the idea. Thanks! ~ Robin
Personally, I think this thread is the right place to showcase what you're talking about. Another thread won't get the exposure, IMHO.

Aeronca
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Old Jun 17, 2012, 08:50 AM
Flyr John in Floyd VA
United States, VA, Floyd
Joined Nov 2007
566 Posts
[QUOTE=cubcrafter60;21919215]

I don't want to take anything away from this thread

Robin, if you really wish not to take anything away from this thread, you'll drop your idea! Please don't start another thread. For those that want to review pictures, they can access attachments through the tools menu and scroll through all the pics. But this is such a great source of info and ideas, I'd hate to see it diluted.

Strongly held opinion from John!
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Old Jun 17, 2012, 10:16 AM
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Phaedra's Avatar
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I finished it according to the original cub I used to fly fullscale. It crashed sadly enough a few years ago, total loss, stalled on takeoff.
It was built in 1948, and the club restored it only a couple of years before the crash.
My funcub uses the Himax tuning motor, 13x4 prop. I had to use the metal motor mount too, because of excessive vibrations. That solved the problem in one go, and it flies like a charm. Vertical takeoffs are no exception.
I get more than ten minutes of flight time with 2600 mAh 3s batteries.
Love this little plane.
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Old Jun 17, 2012, 10:44 AM
Will it ever Fly?
Flybynight2's Avatar
United States, SD, Platte
Joined Nov 2011
422 Posts
Quote:
Originally Posted by gmeyer View Post
does anyone know what the screw pitch is for the fun cub wing bolts??? I know the bolt is a M5 but I can't seem to get a nut on the bolt from the hardware store I got glue in the plastic hold downs and I want to clean them out with debonder and a homemade tap. Thanks Greg
Yes I had the same thing happen

Its a M5 X 0.8 Metric Tap

My local ACE had one
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Last edited by Flybynight2; Jun 17, 2012 at 10:45 AM. Reason: added
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