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Author Topic: Helical balsa tube fuselage for P30 or...  (Read 168 times)
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PantherM100
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« on: March 15, 2021, 05:09:41 PM »

Hi Guys and Girls:
I'm sure this subject has come up
Before so, so has someone applied
Some 21st century methodology to
Rolling a very thin, maybe .015” - .020
Balsa sheet by approx. 1.0” wide over a
Mandrel, but wound / rolled on in continuous
Helical pattern. Then reverse the direction of the
Helix and apply another very thin balsa sheet, on
Top.  Seems to me, would be very light while
Giving the strength of a helically laminated
Structure.  Much less prone to collapsing in a finger
grasp position.  And more twisting strength.
Of course there may be some minimal weight
Penalty.  I’m sure that Mr. Frank Zaic probably
Outlined such a structure in one of his year books,
But which one???
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DavidOWade
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« Reply #1 on: March 15, 2021, 07:32:20 PM »

For starters, that would be a lot of glue to stick the laminations together so I would expect more than a minor weight penalty. However, recognize a 1" x 36" strip wrapped around a 1" mandrel would yield a motor tube about 10 1/2" long. How long of a strip can you come up with?
David
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« Reply #2 on: March 15, 2021, 07:41:32 PM »

Hi Guys and Girls:
I'm sure this subject has come up
Before so, so has someone applied
Some 21st century methodology to
Rolling a very thin, maybe .015” - .020
Balsa sheet by approx. 1.0” wide over a
Mandrel, but wound / rolled on in continuous
Helical pattern. Then reverse the direction of the
Helix and apply another very thin balsa sheet, on
Top.  Seems to me, would be very light while
Giving the strength of a helically laminated
Structure.  Much less prone to collapsing in a finger
grasp position.  And more twisting strength.
Of course there may be some minimal weight
Penalty.  I’m sure that Mr. Frank Zaic probably
Outlined such a structure in one of his year books,
But which one???

https://www.hippocketaeronautics.com/hpa_plans/details.php?image_id=11545

Funny you should ask, I uploaded in the plans gallery  "Rolling Your Own- Straight"   under tips tools and other helpful stuff.
On the fourth page you will find some information on spiral wrapping balsa tube bodies.
Instead of a second layer of balsa, spiral wrap your tissue paper the opposite direction for added strength and save weight.

                                                       Bob
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"If it looks stupid, and it works..... It's not so stupid."
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