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Building Tips and technical articles. => Building techniques => Topic started by: Chris Edinger on January 16, 2008, 08:41:03 PM
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Gents..
I have a full fuselage design i want to also build in a profile version... my questioin is ... given the additional weight of the full fuse model.. should i extend the distance from wing to horizontal stab on the profile to keep it from possibaly being nose heavy?? AND...........is there a severe weight difference in the white insulation foam and the pink or blue more denser foam... I have a lot of the corning pink 2" dense foam.. thinking about cutting some cores from that.?? thanks in advance for your input..
Chris
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Build the profile the same size as the full fuse - there will be little if any difference in weight if you use a solid profile compared to the full fuse.......unless you taper the profile of course.
The foam thing I cant help on really - someone else can chime in there,
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You might consider reducing the distance between the engine and wing centerline to keep the vertical CG right when building the profile version.
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I have always been told that a full fuselage can be built lighter than a profile fuselage, using the same outline. It only makes sense since there is less actual wood and more *air* in a built up fuselage. This is considering the traditional solid wood plank for a fuselage. I am think that the *built up profile* fuselage technique might dispel this theory, though, since you are entering *air* back into the equation.......
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Gents..
is there a severe weight difference in the white insulation foam and the pink or blue more denser foam... I have a lot of the corning pink 2" dense foam.. thinking about cutting some cores from that.?? thanks in advance for your input..
Chris
I found that the colored foam (genuine Dow-Corning Styrofoam, Pink Panther, and the green Royal Dutch Shell ) is TWICE as heavy and twice as strong as the cheap, generic white foam.
I built a few planes with a plank of genuine Styrofoam. I cut the cores a lot thinner, but still came out an ounce to the bad. Unless you're into the battering ram style of combat, there isn't much reason to use colored foam.
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Some of the colored foam give off TOXIC or harmful fumes when heated. %^ %^
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What Mike said! However, I have cut blue foam with the wire with no adverse efects, but I have heard from enough people in the know about the fumes from some colored foams to be very leary of doing so again.
And as stated above, the white is 1/2 the weight of the blue. Don't know a thing about pink except that only REAL men wear pink shirts! LL~ LL~ LL~ LL~ LL~ y1 y1 y1 y1 y1
Will
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STRYOFOAM is made from styrene plastic, DUH!!!! All the foams will give off toxic fumes when cut with hot wire! Just to be safe wear a good filter mask when around hot wire cutting. Correct me if I'm wrong.
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Some of the colored foam give off TOXIC or harmful fumes when heated. %^ %^
One more thing about the heavy, colored foam:
It takes A LOT more energy to cut it. Your power source for cutting white foam may not "cut it".
Even if it does, Al Gore might include you as a villian in his next global warming epic.
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panther -- Pink Panther !!! You saying he wasn't a real man ??
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Wow... thanks for the input ... i insulated my shop with the .. Pink Stuff..... and had some left.. sorry but im.. uh.. lets say.. frugal.. not cheap.. <= thanks again.. by the way Will. ... I do have a Pink Shirt... ;D