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Author Topic: For what it's Worth  (Read 1020 times)

Offline John Rist

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For what it's Worth
« on: September 28, 2010, 11:14:41 PM »
There is a picture of me and my trashed Eindeckered on page 130 of the October Model Aviation. Bill Boss' Controle Line Scale column presents my tale of woe on why you can't use just one insulated line for an electronic throttle.

 HB~>   mw~   n~

Uneven line drag with one insulated line will drive the ship up and over the top when you slow down (I had the one insulted line as the up line).
John Rist
AMA 56277

Offline Tim Wescott

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Re: For what it's Worth
« Reply #1 on: September 29, 2010, 09:34:10 AM »
There is a picture of me and my trashed Eindeckered on page 130 of the October Model Aviation. Bill Boss' Controle Line Scale column presents my tale of woe on why you can't use just one insulated line for an electronic throttle.
I saw that -- it made me wince.  I hope it's rebuildable.

Quote
Uneven line drag with one insulated line will drive the ship up and over the top when you slow down (I had the one insulted line as the up line).
Surely you mean that you had the one insulting line as the up line?

Nasty way to crash.
AMA 64232

The problem with electric is that once you get the smoke generator and sound system installed, the plane is too heavy.

Offline John Witt

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Re: For what it's Worth
« Reply #2 on: September 29, 2010, 12:23:00 PM »
This info was a prime consideration for not using a single insulated line for my Jenny.  It flies very nicely on TWO insulated .021 cables, about .030 diameter insulation. I keep them clean and have not yet had any trouble with friction between the two, even in very slow (what else!) flight.  Flying weight a bit over 10 lbs.

So if it's any consolation, the advice saved another airplane.

John
John Witt
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Edmonds, WA
"Houston, Tranquillity Base here. The Eagle has landed."

Offline john vlna

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Re: For what it's Worth
« Reply #3 on: September 29, 2010, 05:22:01 PM »
I was having problems with excessive line drag on smaller light models using insulated lines until Clancy Arnold told me to try making my own. I coat them with two coats of polyurethane, it hardly adds any size and additional drag.  The polyurethane provides enough insulation. It works great to use throttle control on electric powered  or servo drive glow 1/2a's.

Offline John Rist

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Re: For what it's Worth
« Reply #4 on: September 29, 2010, 09:48:26 PM »
I saw that -- it made me wince.  I hope it's rebuildable.
Surely you mean that you had the one insulting line as the up line?

Nasty way to crash.

OK OK so I can't spell -- I did mean insulating.  PS spell checker only works if you can read  n~  LL~

For what it's worth I have not repaired the Eindecker.  It is big and heavy and the scale was not all that true.  If I fix it I will need to design and build a wing from scratch.   The current wing is from a Senior Telemaster.  Flies great but the airfoil is all wrong.  Also it was underpowered. It needs a Saito 115 4C.  I sold the RCV 120 that was in it.  The RCV swings a big scale prop but is low on power.

 D>K
John Rist
AMA 56277


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