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Author Topic: change a full fuse to a profile fuse??  (Read 1179 times)

Offline Chris Edinger

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change a full fuse to a profile fuse??
« on: January 16, 2008, 08:41:03 PM »
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
Lee's Summit MO
AMA 896082

Offline Wynn Robins

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Re: change a full fuse to a profile fuse??
« Reply #1 on: January 16, 2008, 09:05:51 PM »
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,
In the battle of airplane versus ground, the ground is yet to lose

Offline Crist Rigotti

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Re: change a full fuse to a profile fuse??
« Reply #2 on: January 16, 2008, 09:33:57 PM »
You might consider reducing the distance between the engine and wing centerline to keep the vertical CG right when building the profile version.
Crist
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Offline Bill Little

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Re: change a full fuse to a profile fuse??
« Reply #3 on: January 16, 2008, 11:46:50 PM »
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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Online Paul Smith

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Re: change a full fuse to a profile fuse??
« Reply #4 on: January 17, 2008, 05:48:00 AM »
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.

Paul Smith

Offline Mike Spiess

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Re: change a full fuse to a profile fuse??
« Reply #5 on: January 17, 2008, 07:54:58 AM »
Some of the colored foam give off TOXIC or harmful fumes when heated. %^ %^
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You get OLD cause you stopped flying
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Offline Will Hinton

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Re: change a full fuse to a profile fuse??
« Reply #6 on: January 17, 2008, 08:10:41 AM »
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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Offline don Burke

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Re: change a full fuse to a profile fuse??
« Reply #7 on: January 17, 2008, 08:45:03 AM »
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.
don Burke AMA 843
Menifee, CA

Online Paul Smith

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Re: change a full fuse to a profile fuse??
« Reply #8 on: January 17, 2008, 10:46:18 AM »
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 ??
Paul Smith

Offline Chris Edinger

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Re: change a full fuse to a profile fuse??
« Reply #9 on: January 17, 2008, 09:00:48 PM »
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
Lee's Summit MO
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