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Yb39/yb49 bomber flying wing

Old 03-24-2011, 10:04 PM
  #1  
Terry.0132
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Default Yb39/yb49 bomber flying wing

I have been reading up recently on the YB49 which seems to have come to a politically sticky end in the 1950's. It looks such a graceful flying wing that I would like to try to build one. Probably using depron with a kFm airfoil and a 1000mm wspan.
I fed the following into the "flying wing calculator" span 39"(100cm), rootchord 10" (25cm) tipchord 2.25"(5.5cm) and sweep 9"(23cm). This gives very nearly the scale planform of the original YB49.
It is unfortunate that I will probably be using a single pusher motor, because of the difficulty in sinking EDF units into a kFm wing of that scale.
Has anyone made a model of the YB49, that could possibly show ideas of plans.
This will be my build (3rd in line) for winter Jul/Aug.
Any ideas out there?
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Old 03-24-2011, 11:25 PM
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kenchiroalpha
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Hi Terry
Pleased to meet you
Sounds like a wonderful build cant wait to see more
Check out this page
http://www.the-blueprints.com/bluepr...orthrop_yb-49/
Some history
http://www.century-of-flight.net/Avi...y/Northrop.htm
Take care
Yours Hank

Last edited by kenchiroalpha; 08-15-2011 at 02:42 AM.
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Old 03-25-2011, 09:41 PM
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Terry.0132
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Hi Hank,
thanks for the links, for to my file pack for the second half of the year build, wings I am currently flying are Swift II, Mini Tornado and various Divinity types. T
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Old 03-25-2011, 09:47 PM
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kenchiroalpha
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[QUOTE=Terry.0132;795886]Hi Hank,
thanks for the links, for to my file pack for the second half of the year build, wings I am currently flying are Swift II, Mini Tornado and various Divinity types. T[/QUOTE
Hi Terry
I only have one wing at the moment, wonder why as i have lots of the other different types of aircraft
Will have to fix that and get a few more
Heres a few photos of her
Do enjoy
Take care
Yours Hank

Last edited by kenchiroalpha; 08-15-2011 at 02:42 AM.
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Old 03-25-2011, 10:04 PM
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Terry.0132
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Wow, a lot of detail there, is she a sloper or where is the power hidden,
Yours aye,
Terry
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Old 03-25-2011, 10:12 PM
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kenchiroalpha
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Originally Posted by Terry.0132 View Post
Wow, a lot of detail there, is she a sloper or where is the power hidden,
Yours aye,
Terry
Hi Terry
Shes a old Airrage version
She was a 2 channel twin motor differntial thrust, motors are between the stabs
Since then ive converted her to 4 channel still using the twin motors for throttle and now have rudder and elevon control
Take care
Yours Hank
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Old 03-26-2011, 02:24 AM
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mclarkson
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I've actually got a pilot's manual for the YB-49. Don't know that it would be of much help to you, though. Lots of stuff about how to use the intercom, correct flap settings, etc.
It's the same as this one:
http://cgi.ebay.com/PILOTS-HANDBOOK-...-/200579221013
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Old 04-06-2011, 05:07 AM
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FlyWheel
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Most definitely subscribed! the YB-35/49 is my favorite bird! (YB-35 if you're going to use pusher props).

Even if you are going to build with foam instead of wood.

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Old 04-06-2011, 08:40 AM
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JetPlaneFlyer
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Here's a plan for a Balsa YB-35.. Seemes a shame not too make a scale type airfoil and bury the motors inside the wing....
Attached Files
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Old 04-06-2011, 09:55 PM
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Terry.0132
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When i do get round to building, I will most likely use depron, what I like about the yb39/49 is the beautiful relationship between the widths and the angles. The first build I make will probably have a span of about a meter so I do not think I have the skill to make it a multi engine. My first will probably use a single brushless pusher. When I scale up to 2m I hope my knowledge and building skill and parts availability will let me go to multi engine.

JetPlaneFlyer thanks for a look at the plan, It gives me a lot better idea of the depth (fatness) of the fuse.
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Old 04-07-2011, 01:59 AM
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FlyWheel
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Originally Posted by JetPlaneFlyer View Post
Here's a plan for a Balsa YB-35.. Seemes a shame not too make a scale type airfoil and bury the motors inside the wing....
Then build the YB-49; it's the one that had the eight turbofan engines. The YB-35 had eight counter-rotating pusher props on four engines, which Northrop never could get to work right (that's why they changed to the jets).

It also knocked the Wing out of the long and into medium range category. If they had gotten the prop version to work right it would reputedly have had a 10,000 mile range with a 10,000 pound load capacity.

Thanks for the plans, I can't view them on my WTV, so I'll have to wait until I'm back on my computer. If I can get it to load WF, that is. (I hate HughesNet)!

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Old 04-07-2011, 02:13 AM
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kenchiroalpha
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Originally Posted by FlyWheel View Post
Then build the YB-49; it's the one that had the eight turbofan engines. The YB-35 had eight counter-rotating pusher props on four engines, which Northrop never could get to work right (that's why they changed to the jets).

It also knocked the Wing out of the long and into medium range category. If they had gotten the prop version to work right it would reputedly have had a 10,000 mile range with a 10,000 pound load capacity.

Thanks for the plans, I can't view them on my WTV, so I'll have to wait until I'm back on my computer. If I can get it to load WF, that is. (I hate HughesNet)!

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Hi Chris
Do enjoy
[media]http://www.youtube.com/watch?v=iPnlZSldXSA&feature=related[/media]
[media]http://www.youtube.com/watch?v=ub6U9CL0K_A[/media]
Take care dear friend
Yours Hank
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Old 04-07-2011, 03:23 AM
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FlyWheel
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Have you ever seen the show The Wing Will Fly? I think you can get it from Amazon.com. VHS only though

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