Rob C and Martin D

Rob C.... Good looking, highly experienced radio control flyer. Martin D.... 40'ish, middle age spread kicking in. Motto "You build it, i'll fly it"

Thursday, 27 September 2012

It never stops. Fosa ballast tube repairs

Even though I do everything that is possible to make sure there is no need for me to do building, repairing or maintenance, something always seems to go wrong!

I couldn't believe it when on Monday evening I was putting the fuz ballast in and the back of the ballast tube gave way. The ballast just went straight through the back.

I dropped a mail to Baudis, got a reply but wasn't really any use. I gave Rob a call but again completely useless.

After alot of pontificating about how I was going to fix this without removing the ballast tube I came up with the following method.

I cut a piece of foam that I could squeeze down the tube. I marked a steel rod so I was a able to ensure I would push the foam far enough but not too far. I wanted to create a foam bung as a base for epoxy to create a new solid end

I connected some tubing to a syringe. I had put the tubing in the ballast tube and marked it so I knew when the end of the tube would be resting against the foam bung

The fuselage taped to a dining room chair. Gravity would play an important part in this repair. 
I mixed up a load of epoxy, filled the syringe with the epoxy and with the tubing balanced on the foam bung , fired it in

I left this overnight. The following day I rammed a steel bar down the tube and miraculously my repair seems to have worked. The end of the ballast tube now has avery solid epoxy bung in the end . Brilliant.



  1. Your always going to have that doubt in the back of your mind... will that ballast break through to the back of the fuz when i yank on that elevator, possibly ending some dog walkers life?


  2. I am not fussed, I don't like dog walkers on Slopes!!


  3. Its a Proper fix , Although a bit of wetted out carbon packed down the end now would make sure it dont come out on a nose in landing , cos as we all know at first your thrown forwards, then your recoiled back !!!!!
    The Dogwalkers are safe again .

    Which , to be honest

    Sux ,

    Hope its all good Martin ;)