G BERTELLA F-4 TWIN DF - RCCanada - Canada Radio Controlled Hobby Forum
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Old 12-21-2003, 04:58 PM   #1
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anyone familiar with the bertella plans i have the F-4 plans and have started to cut the peices has anyone got any info on how they fly.
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Old 12-25-2003, 10:42 AM   #2
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i am surprised no one here has any info on the bertella plans does any one have any idea's on how to make the ducting
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Old 01-13-2004, 07:04 PM   #3
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Hi ; I used to subscribe to R/C Jet International , a publication from England.

There have been quite a few pics of aircarft build from Berttella plans. They all say they fly well. I have his catologue but never ordered anything yet.

As far as the thrust tube , it should say how to build it on the plans somewhere. I know most of the wood build up jets use clear acetate or that white plastic sheet that Bob parkinson uses in his kits. It must be fuel proof of course.

Hope this helps you out.
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Old 02-18-2004, 09:04 PM   #4
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You can use thin mylar to make the thrust tubes, the old Byron kits used it. Just make sure the seam is glued solid, allow a good overlap and scuff up the gluing surfaces also.
Another way is to make a fiberglass tube. Lay up two layers of 2.3 oz cloth to the right size on a sheet of glass or the white painted particle board material you can get at home depot. Wax the surface several times with a good paste wax. Once cured ease it off and wash the fiberglass sheet in warm soapy water. If you used epoxy, the cloth will get really flexible if the water is too hot.
Now just roll the sheet to the right diameters, mark the seam and leave yourself at least a 1/2" overlap. If you used epoxy, then glue it together with epoxy, if you used polyester resin, then use poylester resin or Goop adhesive. Don't use epoxy if you made the sheet with polyester resin, it will not bond.
Do not use just a single thickness of cloth, you will get too many pin holes and the tube itself will not be as strong. The lighter cloth will also be somewhat flexible.
At the big end where the tube attaches to the fan or extension, I would wrap a couple of 1/2" strips of the cloth around the edge to give it some strength and tear resistance.
Good luck, if you require any more info, or supplies, I can help you out if a fiberglass suppply is not near you.
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