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Kitty Hawk Flying Flapjack.

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  • Member since
    November, 2009
  • From: Twin Cities of Minnesota
Kitty Hawk Flying Flapjack.
Posted by Don Stauffer on Friday, July 06, 2018 9:31 AM

The KH 1:48 Vought XF5U has finally made it to my modeling bench. 

This experimental plane was a way to achieve more efficiency from a low aspect ratio wing, ordinarily not that efficient due to high induced drag.  The high drag is ordinarily due to very strong tip vortices from low aspect ratio wings.  On the other hand, short wings lead to good roll rates, and easier storage on carriers.  Vought attempted to reduce the tip vortices with huge geared props on the wing tips turning in the opposite direction to the tip vortices.  Top speed was predicted to be over 500 mph!

The plane was in the pre-production prototype phase, only a few aircraft produced, late in war, when it was undone by the rapid progress in US jets.  In spite of all those TV and book stuff, US did have fantastic prototypes as wierd as anything the Germans had.

Like typical KH kits, it seems to be a nice kit- good fit, little flash, good detail.  However, it has the typical problem with good detail- large sprue attachment points to very thin parts.  I broke one of the rudder pedal (with hangers) trying to cut it loose from the sprue :-(   Scratched another one okay and proceding on!

Don Stauffer in Minnesota

  • Member since
    November, 2009
  • From: SW Virginia
Posted by Gamera on Friday, July 06, 2018 11:16 AM

Oh that's awesome Don! I've got a kit from some limited run company, I forget which one at present that I haven't had the guts to tackle yet.

Cockpit looks good! Sucks about the broken part but glad to hear you were able to replace it. 

 

PS: Yeah, the Germans may have had the most insane secret projects but the Allies and Japan weren't too far behind..... 

"I dream in fire but work in clay." -Arthur Machen

 

  • Member since
    March, 2015
  • From: Streetsboro, Ohio
Posted by Toshi on Friday, July 06, 2018 11:25 AM

This should be a unique build.  Looking forward to more.

Your friend, Toshi

On The Bench: Academy 1/72 B-17F Flying Fortress

Next Up: Revell 1/48 B-25 Mitchell, Trumpeter 1/32 TBF Avenger

Married to the most caring, loving, understanding, and beautiful wife in the world.  Mrs. Toshi

 

 

  • Member since
    June, 2014
Posted by BrandonK on Friday, July 06, 2018 1:29 PM

Very cool. I've been waiting for someone to build one of these. Watching with interest.

BK

On the bench: Monogram 1/48 Kingfisher with cockpit and resin engine. 90%

1/25 MPC Deserter GMC 4x4.   2%

On Deck: 1/48 Hobby Boss Ta-152C1/R14

1/650 AMT U.S.S. Enterprise

  • Member since
    December, 2010
  • From: Salem, Oregon
Posted by 1943Mike on Friday, July 06, 2018 1:51 PM

Very interesting subject.

Even if jet powered aircraft hadn't doomed the project I would imagine the complexity of the gearing/transmission would have.

Mike

"Le temps est un grand maître, mais malheureusement, il tue tous ses élèves."

Hector Berlioz

  • Member since
    May, 2011
  • From: Honolulu, Hawaii
Posted by Real G on Friday, July 06, 2018 5:16 PM

Vought built the V-173 as a full-scale demonstrator to validate the STOL capabilities.  Although underpowered, it did prove the concept.  But when you scale up the weight, add 2X 2,000 HP engines plus "flapping" props hubs to the equation, things could have turned out not so well.  Yeah, and those big engines transmitting all that power through two 90 degree gearboxes...

A fascinating design nevertheless.  I have the Pegasus abomination and the much better Hasegawa version in 1/72.  Look forward to seeing yours built!

  • Member since
    November, 2009
  • From: Twin Cities of Minnesota
Posted by Don Stauffer on Saturday, July 07, 2018 9:42 AM

Real G

Vought built the V-173 as a full-scale demonstrator to validate the STOL capabilities.  Although underpowered, it did prove the concept.  But when you scale up the weight, add 2X 2,000 HP engines plus "flapping" props hubs to the equation, things could have turned out not so well.  Yeah, and those big engines transmitting all that power through two 90 degree gearboxes...

A fascinating design nevertheless.  I have the Pegasus abomination and the much better Hasegawa version in 1/72.  Look forward to seeing yours built!

 

I have thought that the concept would work for human powered aircraft.  The aspect ratio needed for human flight is awesome.  The resulting structure has to have awesome technology.  I think a simple cable drive turning both props at same speed but counter-rotating wouldn't be that complex or heavy.  Low aspect ratio structures seem to be simpler to build.

 

Don Stauffer in Minnesota

  • Member since
    June, 2017
  • From: Winter Park, FL
Posted by fotofrank on Saturday, July 07, 2018 5:19 PM

Saw the kit today at the hobby shop where had our build day. I stroked my chin and thought "hmmm, could be fun." I'll be watching, Don.

OK. On the bench:

MENG 1/48 F-35A dedicated to my late brother Buzz.

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