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General control line discussion => Open Forum => Topic started by: frank williams on August 13, 2020, 10:34:18 AM

Title: R Burns discussion on building composite structures
Post by: frank williams on August 13, 2020, 10:34:18 AM: I can't find any link to Ron Burns discussions of how he built his composite structures (carbon veil and 1/32 balsa I think). It might have been on StukaStunt but I can't seem to get into it anymore. His had some pictures and discussion of building his large semiscale stunters. For those who don't know, Mr. Burns had the exquisite F4F Wildcat at the Virginia Beach Nats.
Thanks
Title: Re: R Burns discussion on building composite structures
Post by: TDM on August 16, 2020, 07:16:26 PM: Veil will not add any structural benefit other than finger nail ding protection when added to the outside shell of the model.
Title: Re: R Burns discussion on building composite structures
Post by: Reptoid on August 16, 2020, 09:41:34 PM: Yup Carbon Veil adds very little structural strength. If you guys want to see some actual modern construction methods and what is actually possible; Look up composite sailplanes. There are numerous articles and how to's on real lightweight composite construction. The technology is so far advanced from what's being done in Controline it's incredible. Hollow molded spread tow carbon for example. Techniques like vacuum bagging can be used to form very light rigid airfoiled surfaces. The ultimate is hollow molded but good molds are pricey (CNC machined solid aluminum with textbook perfect airfoils) and out of the realm of possibility for most home builders. There are a couple venders in Ukraine and Russia selling complete take apart ready to finish or ready to fly F2B models now that utilize some of that tech. Things like molded in sealed hinge lines are doable.
Title: Re: R Burns discussion on building composite structures
Post by: TDM on August 18, 2020, 06:16:37 AM: Quote from: Reptoid on August 16, 2020, 09:41:34 PM
Yup Carbon Veil adds very little structural strength. If you guys want to see some actual modern construction methods and what is actually possible; Look up composite sailplanes. There are numerous articles and how to's on real lightweight composite construction. The technology is so far advanced from what's being done in Controline it's incredible. Hollow molded spread tow carbon for example. Techniques like vacuum bagging can be used to form very light rigid airfoiled surfaces. The ultimate is hollow molded but good molds are pricey (CNC machined solid aluminum with textbook perfect airfoils) and out of the realm of possibility for most home builders. There are a couple venders in Ukraine and Russia selling complete take apart ready to finish or ready to fly F2B models now that utilize some of that tech. Things like molded in sealed hinge lines are doable.

Don that sums up the REVOLUTIONS build. I come from the glider world and have built those too. Revolutions wing are build with hollow molded and they do use spread tow. Yes the hinge line is sealed. The molds are cut with CNC machines. The only thing I don't have from your list is that I am in the USA not Ukraine.
Title: Re: R Burns discussion on building composite structures
Post by: Reptoid on August 18, 2020, 12:51:09 PM: Yes, I have seen some of your work on line. I was just more aware of the commercial availability of molded take apart technology from the Ukraine and Russia since I buy F2D stuff from venders there regularly.