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Old Jan 20, 2009, 04:51 AM
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N99JH's Avatar
Hartsville, SC
Joined Apr 2006
848 Posts
Xb-35

Quote:
Originally Posted by Hepdog
When you are ready to tackle that big flying wing give me a call. Making it stable isnt impossible
XB-35 flying wings were successfully flown in R/C format well over 20 years ago so making it fly in a stable manner is not a problem at all. Just have the CG at 22-25% MAC.
Joshua
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Old Jan 20, 2009, 06:42 AM
It only takes one good idea
dag214's Avatar
Fishers, Indiana
Joined Oct 2004
5,999 Posts
Quote:
Originally Posted by N99JH
XB-35 flying wings were successfully flown in R/C format well over 20 years ago so making it fly in a stable manner is not a problem at all. Just have the CG at 22-25% MAC.
Joshua
The CG has never been a concern to me, after reading the history of it and looking at how it flew the plane was very stable. From what I have read the one that crashed was because the pilots took it out and performed un-approved deep stalls, bad idea in a plane that already had light yaw control.

My only worry would be at a scale of less than 150" if there is enough scale vertical stab area for the plane to be stable in the yaw axis. Just my 2 cents, but what a cool plane it would be.

DAG
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Old Jan 20, 2009, 07:17 AM
Gentle 'Bella'
gnats82's Avatar
Augusta, KS USA
Joined Dec 2007
4,654 Posts
DAG -

There was a discussion thread started in scale electric planes about the B-35s in case you're interested. Motivated by having known one of the XB-35 crew (flight engineer O.H. Douglas) in my youth, I've had a N9M on the 'back burner' for some years and I'm sure that the split drag rudders would be as worthwhile on the model as they were needed on the full scale. Perhaps coupling with a gyro would be possible.

Edit: It appears that the discussion thread in Scale Electric Planes on the X/Y B-35 has died.
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Old Jan 20, 2009, 08:44 AM
HAL... Open the damn doors!
jfetter's Avatar
Miramar, Florida
Joined Jul 2007
8,469 Posts
Quote:
Originally Posted by Draknkep
I wish they showed one setup in the contra-rotating configuration, all the ones they show are configured for gang operation. I'd like to see their hardware because I wouldn't mind trying the larger one on a 90-sized plane and using 2 props, might be fun!

Jack
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Old Jan 20, 2009, 09:26 AM
Gentle 'Bella'
gnats82's Avatar
Augusta, KS USA
Joined Dec 2007
4,654 Posts
Jfetter -

I looked at the link page too and think we are seeing them in the counter-rotating configuration. The anodized blue case turns in on direction, the metal finish shaft rotates in the other. Is that what you meant?
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Old Jan 20, 2009, 09:30 AM
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RiBell's Avatar
Canada, BC, Abbotsford
Joined Jan 2003
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We have a fly-in in May at a local field it's a pretty big event for us locally.
Last year a guy (don't know who he was) brought a X-35; it was about a 60"-70" ish span; covered with chrome Monokote. Sadly it stalled on landing.
Here's a couple of pic's of it.
Rick
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Old Jan 20, 2009, 09:59 AM
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Angelo's Avatar
Chicago, IL
Joined Nov 1999
2,051 Posts
What a beautiful model, it's a shame he crashed it, hope it wasn't totaled.

The contra-rotating props on the XB-35 were so problematic that they tried flying it with regular props, so this is a scale arrangement. Performance suffered a lot tho, and the XB-35s propulsion problems weren't fixed until switching to jet engines, yielding the YB-60.
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Old Jan 20, 2009, 10:13 AM
Gentle 'Bella'
gnats82's Avatar
Augusta, KS USA
Joined Dec 2007
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Angelo -

Did you mean YB-49? It is the jet engined successor to the B-35 design.

They hadn't developed temporary spin recovery systems in the YB-49 era as they used in B-2 development. Pity that they lost some great fliers (i.e. Glen Edwards) and the YB-49 from a simple test proceedure, apparently while coming down from a high altitude.
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Old Jan 20, 2009, 10:54 AM
HAL... Open the damn doors!
jfetter's Avatar
Miramar, Florida
Joined Jul 2007
8,469 Posts
Quote:
Originally Posted by gnats82
Jfetter -

I looked at the link page too and think we are seeing them in the counter-rotating configuration. The anodized blue case turns in on direction, the metal finish shaft rotates in the other. Is that what you meant?
No, in the coutra-rotating configuration you'll see 2 prop hubs, these are all ganged. Turns out some of these are not yet available, not sure what kind of timing there might be but I'll watch over the next few months...

Jack
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Old Jan 20, 2009, 11:28 AM
Awsome 2.5D Pilot.
bigbobed's Avatar
Foxfire Village, NC
Joined Nov 2003
1,454 Posts
here you go.
http://www.espritmodel.com/index.asp...OD&ProdID=3116
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Old Jan 20, 2009, 11:59 AM
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N99JH's Avatar
Hartsville, SC
Joined Apr 2006
848 Posts
Quote:
Originally Posted by bigbobed
This is not a counter-rotating configuration. It is two motors coupled together.
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Old Jan 20, 2009, 12:09 PM
Its all fun
Tonystott's Avatar
Australia, NSW, Forster
Joined Oct 2004
7,162 Posts
The diagrams certainly show counter-rotating, as does the description. Look at the ballraces in the hub of the prop nearest the motors. The rear prop is not connected to the shaft leading to the front prop.
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Old Jan 20, 2009, 12:21 PM
HAL... Open the damn doors!
jfetter's Avatar
Miramar, Florida
Joined Jul 2007
8,469 Posts
Quote:
Originally Posted by N99JH
This is not a counter-rotating configuration. It is two motors coupled together.
I posted this picture yesterday. Yes, this picture shows the correct contra-rotating configuration. The rear prop bolts directly to the motor in front (the can itself). The prop hub you see is secured to the inner (contra-rotating) shaft via 2 set screws, if for the forward prop...

Jack
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Old Jan 20, 2009, 12:32 PM
RCHN #150
Rickn816's Avatar
Lawrenceville, GA
Joined Nov 2007
5,996 Posts
Quote:
Originally Posted by sneasle
Hobby city has a counter rotating double motor setup that is smaller then the Axi. Let me see if I can find it.


Here it is:

Linky

It might be too small for you, but it's a heck of a lot cheaper.

It's a 300W system, so with 4 of them my mental math says something like a 70" wing maybe?
Whew. That beats $950 each.
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Old Jan 20, 2009, 12:41 PM
HAL... Open the damn doors!
jfetter's Avatar
Miramar, Florida
Joined Jul 2007
8,469 Posts
Quote:
Originally Posted by Rickn816
Whew. That beats $950 each.
Yeah but the HC one is 300 watts x 2 while the Axi is 2,600 watts x 2, not really apples to apples...

Jack
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