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Old Oct 09, 2002, 09:31 PM
Motor Maniac
Orange County, CA
Joined Feb 2002
2,875 Posts
Gym-E, component weights

Just got my Gym-E kit, but haven't started building yet. Started weighing the components before starting construction.

The CF boom weighs 18.3g. This seems a bit heavy for this type of CF rod for such a small plane. Is this boom overkill?

I weighed the leading and trailing edge dowels and found that the two trailing edge dowels differed in weight considerably. One was 2.3g and the other 3.4g. I checked the weight several times to make sure there was no measurement error. Seems like a lot of difference for dowels of the same size. Should I use the heavier one for the center section (heavier = stronger?)?

How many of you have cut holes in the tail balsa to lighten them? My HLG has a V-tail of similar size and has quite large holes in both the fixed and moving surfaces, and it takes quite high forces on launch without any problem.
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Old Oct 09, 2002, 09:50 PM
MKH
Registered User
Ohio
Joined Mar 2000
2,597 Posts
The tails and dowels in my Gym-E kit were very light, so I left them alone. I did replace the boom with a 5/16 balsa dowel, but did this knowing it would eliminate the crashworthyness of the fuselage. I thought it was needed to fly in my 60x80 backyard, but as quickly as this thing turns around, it really wasn't needed. Its a dream to fly.
Marcus
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Old Oct 10, 2002, 02:21 AM
BEC
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Auburn, Washington USA
Joined Jan 2001
12,940 Posts
Good idea to use the heavier wing dowel on the center section. Yes the boom is overkill. No, it's not an issue.

I know Martin (Dreamer) punched holes in his tail surfaces - you can see that in the pick of his Gym-E in his avatar. However, his is the only one of many I've seen around here (including Todd's personal one) that way.
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Old Oct 10, 2002, 04:38 AM
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Martin Hunter's Avatar
Kamloops, BC, Canada
Joined Feb 2002
15,106 Posts
Why I did it that way? I'll give you my best Homer Simpson "I 'unno". Really, I don't remember, as the weight savings with just those few holes would be minimal. It looks cool though, doesn't it?

Martin
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Old Oct 10, 2002, 06:11 AM
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United States, NY, Dutchess
Joined Jun 2002
652 Posts
Yes, it does look cool. I wish I had done that.

Martin, how did you cut them? Did you use a compass/circle cutter or something else?
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Old Oct 10, 2002, 06:53 AM
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Martin Hunter's Avatar
Kamloops, BC, Canada
Joined Feb 2002
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I used a compass cutter. I'm glad to know I'm unique

Martin
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