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Building Tips and technical articles. => 1/2 A building. => Topic started by: john vlna on February 06, 2015, 12:44:56 PM

Title: XP-56
Post by: john vlna on February 06, 2015, 12:44:56 PM

The XP-56 was one of three unusual WWII prototypes, the other being the XP-54 and 55.
I have built a XP-54 and it is a good flier. The XP-56 uses a 1/4A  (.020) size motor as far as power comparisons go, but has a 7x3.5 prop, an unlikely choice for a .02 PeeWee.
Battery is a 2 cell. Span is 20 inches. Hopfully it will fly this weekend

Title: Re: XP-56
Post by: john e. holliday on February 06, 2015, 01:32:08 PM

Looked great until I seen the bottom side.   What a nightmare. LL~ LL~

Title: Re: XP-56
Post by: CircuitFlyer on February 06, 2015, 08:03:54 PM

That is a very interesting bellcrank linkage.  It must have taken a lot of time to work that out.  Great job.  Good luck with the maiden flight.

Paul

Title: Re: XP-56
Post by: mike londke on February 06, 2015, 09:22:33 PM

Neat!

Title: Re: XP-56
Post by: john vlna on February 08, 2015, 10:27:46 AM

Well even with the messy bottom pointed out by Doc, it flies very well. Not a stunter but nice touch and goes. Balance was right on. I need to adjust for more up than down. The small elevators out of the prop blast are ineffective until the take off roll is at high speed. Also it needs a bit of down thrust(I think) since it flies a bit nose high. All in all I a very happy. A bigger one would make an interesting fun or profile scale model.

Title: Re: XP-56
Post by: Bill Little on February 08, 2015, 02:52:36 PM

Quote from: Ty Marcucci on February 08, 2015, 01:25:51 PM

Isn't that the one the Northrop engineers reffered to as the "ascender" as a play on the engines location?

Hi Chief,

The XP-55 was the "Ascender", very similar looks.

BIG Bear
RNMM/AMM

Title: Re: XP-56
Post by: john vlna on February 08, 2015, 06:50:13 PM

The Northrup XP-56 was called the Black Bullet.

Title: Re: XP-56
Post by: wwwarbird on February 08, 2015, 07:11:19 PM

Quote from: john e. holliday on February 06, 2015, 01:32:08 PM

Looked great until I seen the bottom side.   What a nightmare. LL~ LL~

 The "beauty" of electric. :P 

 Really neat airplane though. I'd love to see a bigger version with an IC .15 or .25. y1