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Building Tips and technical articles. => Building techniques => Topic started by: James Mills on January 02, 2007, 08:40:29 PM
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For you guys who have used the Magnum 36, how many layers do I need on the nose (1,2, or ...)?
Thanks,
James
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If the nose construction is built according to the plans/instruction I would not use anything more than a light weight fiber glas material. I use the light weight instead of carbon veil. It is put down using water based poly-urethane clear. Of course the wood has a coat of the same stuff before the glas. The first coat is sanded as smooth as you can get it. I think Al Rabe uses fiber glas on the whole fuselage of his planes. If done right it can be as light or lighter than a dope finish. My opinion, DOC Holliday
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I have always used silkspan and dope and have been pretty pleased with the results. On my latest plane I used silkspan and Minwax water based Polycrylic and it seems to me that its not as stiff or as light as when I use dope. It does seem to be more dent resistant. Does anyone know if the Polycrylic is heavier than dope or epozy? eric
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I suppose it depends on whether you think you really need it. I've used half ounce glass on the nose put down with nitrate, butyrate and thinned epoxy (on different planes, not at the same time ;) ) and they all work fine. I've used CF veil and dope or epoxy and it has worked fine. I've just used silkspan and dope and it has also worked fine. It depends on what you think you need. For an ST60, I might go with fiberglass if I thought I would get a lot of vibration, for instance.
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I guess I should have included what I was building. It's a Shaffer Hallmark with the Magnum 36 and just want to make sure I dampen any vibration. Built pretty much as shown on plans, only change was using Morris controls. I usually use lite weight fiberglass on the nose but have never used this motor and haven't actually built anything this small in a long while.
Thanks,
James
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HI JAmes,
Like I said somewhere else, a layer of 1/2 oz. cloth will be more than enough. The Magnum has very little vibration, almost none if compared to a ST 60 or even a stock Fox 35.
We have built a couple of planes for the Magnum 36, none have needed a beefed up nose. In fact, they can even go "down" a touch from what the practice was when Gene built the Hallmark. 1/32 ply doublers would be fine, and he probably used 1/16th ply. I don't know, I don't have the Hallmark plans, but that was common then. Vibration is just not the same problem with these newer engines.
Bill <><