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Author Topic: Skyfire 2, latest incarnation  (Read 1153 times)

Offline Larry Renger

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Skyfire 2, latest incarnation
« on: November 02, 2008, 07:30:12 PM »
Here are photos of my recently completed Skyfire.  It weighs 7 ounces.  Power is a Tee Dee .049 running side port pressure, a Norvel plug and Kirn-Kraft needle system.  Prop is an APC 6x2.  Tank is 1 ounce.  Wing area is 165 sq.in.  The Cox folded foam wings have an added internal spar that punches the thickness up just a tad and keeps it there (they tend to collapse over time otherwise).  It has a 3" bellcrank, and I use the RSM Ultimate handle to smooth out the level flight and round maneuvers.

I fly it currently on 42.5' .008 cable lines, and may try 45'.  It is rock solid everywhere in the pattern, and a couple of expert fliers are interested in building one.  I may draw up the plans with a built up wing, as the Cox wings are getting rare.  Of course if one of you cottage-industry dudes learned how to mold Depron.....
Think S.M.A.L.L. y'all and, it's all good, CL, FF and RC!

DesignMan
 BTW, Dracula Sucks!  A closed mouth gathers no feet!

Offline Bill Adair

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Re: Skyfire 2, latest incarnation
« Reply #1 on: November 05, 2008, 09:21:29 PM »
Larry,

Very nice!  H^^

Bill
Not a flyer (age related), but still love the hobby!

Offline ray copeland

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Re: Skyfire 2, latest incarnation
« Reply #2 on: November 06, 2008, 11:09:16 AM »
Larry , very nice work!! I would like to do something similar this winter with a Hyper-Viper wing. Not familiar with the t-nut you had mentioned for the pressure nipple or the Kirn-Kraft needle assembly. I have a tee dee .049 that i would like to use on this project. Any info on the t-nut and needle would be appreciated.  Ray
Ray from Greensboro, North Carolina , six laps inverted so far with my hand held vertically!!! (forgot to mention, none level!) AMA# 902150

Offline Mike Anderson

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Re: Skyfire 2, latest incarnation
« Reply #3 on: November 06, 2008, 12:19:37 PM »
Larry , very nice work!! I would like to do something similar this winter with a Hyper-Viper wing. Not familiar with the t-nut you had mentioned for the pressure nipple or the Kirn-Kraft needle assembly. I have a tee dee .049 that i would like to use on this project. Any info on the t-nut and needle would be appreciated.  Ray

Ray - maybe you call it a "blind nut".  A t-nut is the standard motor-mounting blind nut.  I think that
(judging from the picture), the outer diameter is ground down into a "lip" that the pressure tubing will
not slip off of and then the nut is just screwed right onto the plastic nipple.

A kirn-kraft needle assembly is a fine-thread (128 thread/inch) needle valve that replaces the Cox
needle, which is usually too course a thread when trying to run pressure.  Don't know WHERE you might
still be able to get a Kirn-Kraft needle - Ace RC used to have a similar unit, also.

Mike@   AMA 10086
Central Iowa

Offline Larry Renger

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Re: Skyfire 2, latest incarnation
« Reply #4 on: November 06, 2008, 08:59:31 PM »
Right answers, Mike.  Good show!  y1
Think S.M.A.L.L. y'all and, it's all good, CL, FF and RC!

DesignMan
 BTW, Dracula Sucks!  A closed mouth gathers no feet!

Offline Robert W

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Re: Skyfire 2, latest incarnation
« Reply #5 on: November 07, 2008, 05:38:51 AM »
You can get the fine thread needle assemblies from Texas Timers. I got a couple from there and they look like the KK ones I already had from my free flight days.
AMA 28627

Offline Larry Renger

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Re: Skyfire 2, latest incarnation
« Reply #6 on: November 07, 2008, 09:56:03 PM »
Great tip! Thanks, I would like a couple more of them!!!   y1
Think S.M.A.L.L. y'all and, it's all good, CL, FF and RC!

DesignMan
 BTW, Dracula Sucks!  A closed mouth gathers no feet!

Offline Stan Tyler

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Re: Skyfire 2, latest incarnation
« Reply #7 on: November 10, 2008, 02:11:33 PM »
Hi Larry,

Try http://www.texastimers.com/

The link to needle valves is on the left hand side under Accessories.

They also have  needle valve assys that may be useful in other small engines.

Later,
Stan
Stan Tyler
AMA 3239

Offline Larry Renger

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Re: Skyfire 2, latest incarnation
« Reply #8 on: November 10, 2008, 05:34:59 PM »
Thanks, Stan!  I have put in an order. 
Think S.M.A.L.L. y'all and, it's all good, CL, FF and RC!

DesignMan
 BTW, Dracula Sucks!  A closed mouth gathers no feet!


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