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Old Jan 19, 2009, 06:20 AM
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N99JH's Avatar
Hartsville, SC
Joined Apr 2006
848 Posts
Ducted Fans

I support what Jack said, have the installation prepared but don't spend the money and add the extra complexity until after you have flown the aircraft for awhile, got comfortable, and, than if you still want the fans - just drop them in place. The logistics of handling such an aircraft may be enough of a headache without worrying about the extra mass hanging from each wing tip.
Just my 2c.
Joshua
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Old Jan 19, 2009, 08:48 AM
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coptercptn's Avatar
United States, AZ, Mesa
Joined Dec 2008
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ok..I'll put in a couple of pennies also..

I think the addition of the "working" fans is like Mac Hodges adding the X-1! Just sort of puts it "over the top"!

Is it needed? no. but Waaayyyy cooool!!!

Go for it Damon...

Jim
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Old Jan 19, 2009, 09:03 AM
Fly For Fun
United States, FL, Spring Hill
Joined Apr 2002
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Put 'em in .... let 'em spin.

Mike
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Old Jan 19, 2009, 04:59 PM
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roidspop's Avatar
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How about something like this? Authentic, lightweight, a little drag reduction. Incredible undertaking you've got underway here.
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Old Jan 19, 2009, 05:03 PM
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sneasle's Avatar
United States, AL, Huntsville
Joined Sep 2006
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Quote:
Originally Posted by coptercptn
ok..I'll put in a couple of pennies also..

I think the addition of the "working" fans is like Mac Hodges adding the X-1! Just sort of puts it "over the top"!

Is it needed? no. but Waaayyyy cooool!!!

Go for it Damon...

Jim

No.. that would be like adding the Gremlin to his build.
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Old Jan 19, 2009, 05:39 PM
HAL... Open the damn doors!
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Miramar, Florida
Joined Jul 2007
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Not to go off-topic (again) but this build thread has me wanting to build something! I've been looking at maybe something not too common, I think I found it in the B-35 Flying Wing (4 engines, each with 2 counter-rotating props, this would be an electric dream!) but I can't find enough information or plans...

Jack
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Old Jan 19, 2009, 05:43 PM
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United States, AL, Huntsville
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Good choice.

XB-35 is one of my old favorites.
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Old Jan 19, 2009, 05:55 PM
I fly, therefore, I crash!!!
SteveT.'s Avatar
San Jose, CA
Joined Jan 2008
26,692 Posts
Hi Jack....

Well, if anybody could design one for you, I think Dag would be the one. And... contra-rotating props are easy with AXI dual motors, as there are already some available, and Axi will do other sizes if needed. I think Hi-max even has a dual motor setup too...

Also... here is a very nice three view... This was taken from this site that I found on Google, which has a "ton" of great three views.

I too like that plane. Its just too bad that it had all the problems it had. And interesting side note, is that after the B-2 was developed, but before the info was released to the general public, they took Jack Nothrop in to see the plane, at which time, he is purported to have said that God had kept him alive long enough to have his design vindicated...

SteveT
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Last edited by SteveT.; Jan 19, 2009 at 06:07 PM.
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Old Jan 19, 2009, 06:03 PM
Bi-Planes
Tim Farrar's Avatar
Houston Texas
Joined Apr 2006
1,589 Posts
Guy's, I know you already talked about this but I forgot and there are so many posts that I was wondering if you would just tell me again ...lol lol lol...

Why cant regular props just be put on backward and the motors run in reverse ?

Would that mess up the motors or something ?


Seeya, Tim
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Old Jan 19, 2009, 06:11 PM
It only takes one good idea
dag214's Avatar
Fishers, Indiana
Joined Oct 2004
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I spent about a month looking for good info on the XB-35

I have this drawing in a huge format if you want it.

There is enough info out there to come close to getting it right, but the trick will be making it stable, to do so I think it needs a wingspan of, Oh lets say 285" .

DAG
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Old Jan 19, 2009, 06:11 PM
I fly, therefore, I crash!!!
SteveT.'s Avatar
San Jose, CA
Joined Jan 2008
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Quote:
Why cant regular props just be put on backward and the motors run in reverse ?
They could be, as brushless motors only need to have two wires reversed to run backwards, and just like steam engines, they don`t care which way they run.... The problem however, would be in the shaft hub design, as, when you look at the props (especially APC props), the root of the blades curve out in front of the hub, whereas, the back is flat.

SteveT
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Old Jan 19, 2009, 06:12 PM
I fly, therefore, I crash!!!
SteveT.'s Avatar
San Jose, CA
Joined Jan 2008
26,692 Posts
Hi Dag...

That's the same one I posted a link to, I just didn`t want to post the actual three view due to possible copyright infringement....

Uh-oh... I think I know what Dag's next plane will be...

SteveT
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Old Jan 19, 2009, 06:13 PM
It only takes one good idea
dag214's Avatar
Fishers, Indiana
Joined Oct 2004
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Quote:
Originally Posted by roidspop
How about something like this? Authentic, lightweight, a little drag reduction. Incredible undertaking you've got underway here.
I like this look, but want people to see inside.

Thanks, DAG
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Old Jan 19, 2009, 06:15 PM
It only takes one good idea
dag214's Avatar
Fishers, Indiana
Joined Oct 2004
5,995 Posts
Quote:
Originally Posted by Draknkep
Hi Dag...

That's the same one I posted a link to, I just didn`t want to post the actual three view due to possible copyright infringement....

SteveT
I got mine in a huge format from the Russian free site. I did not see anything about not sharing it.

The Russian site has thousands of aircraft drawings for free.

DAG
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Old Jan 19, 2009, 06:19 PM
I fly, therefore, I crash!!!
SteveT.'s Avatar
San Jose, CA
Joined Jan 2008
26,692 Posts
Hi Dag....

For some inexpensive fans with lots of blades (for a semi-scale look) check out theHoaye fans at Hobbycity.com

I have used the 2" ones quite successfully with the Dons "Coolwind" motors in a Great Planes L-39, and the 2.5" ones with an ARC 1.5 turn in a Sapac Foamy T-45.

The nice thing about these fans, is that you can purchase just the rotors if you don`t want the shrouds (as in to just put some rotors in your jet pods.)

You are probably right about sharing...but I figured I would just put the link in...what can I say.. I'm paranoid..

SteveT
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Last edited by SteveT.; Jan 20, 2009 at 02:23 AM.
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