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 Post subject: fan use
PostPosted: 25 Oct 2009 16:24 
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Joined: 25 Oct 2009 13:08
Posts: 7
could i make a plane and use these under the wings http://cgi.ebay.com.au/New-RC-Jet-EDF-70mm-3500kv-Brushless-Motor-Ducted-Fan_W0QQitemZ290326328212QQcmdZViewItemQQptZFR_YO_Jeux_RadioComRobots_VehiculesRadiocommandes?hash=item4398cc3394 thanks jordan


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 Post subject: Re: fan use
PostPosted: 29 Oct 2009 23:48 
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Joined: 05 Aug 2009 02:18
Posts: 287
tigerbomb8,

I noticed no one replied to you in 4 days.

This hobby allows all kind of experimentation and is part of the fun and success satisfaction we get.

It is not likely that many have tried already what you are considering.

Give it a go. Make the model as light as possible. The cost is minimal. If it does not work to your satisfaction, you can always change them for regular motor and props.

You cannot loose much for a try.

Cheers de KILOP


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 Post subject: Re: fan use
PostPosted: 30 Oct 2009 16:57 
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Joined: 20 Jul 2009 21:15
Posts: 103
Location: Corydon, Indiana, US
I have not replied because I know very little about electic powered flight and even less about ducted fans.

I did see an article about a plane in the November issue of Model Airplane News in which a fellow designed and built an electric ducted fan plane that looks really simple. It used one fan in the fuselage. It was called the X1009A Strike.

I agree with KILOP, experimentation is great. With two ducted fans I'll bet you could really make something move!

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 Post subject: Re: fan use
PostPosted: 30 Oct 2009 22:24 
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Joined: 15 Nov 2008 19:31
Posts: 102
Location: Sandy, OR
Seen some R/C airliners.
And a few R/C Me 262's out there. (German fighter from WW2 with a engine under each wing, just incase you are not familiar)

Granted they may have been kits and such. But alot of guys scratch build. And as has been said the sky is the limit on how you want to power it.

Do your research, build it well, and there really is no reason it won't fly. :)

And be sure to share it with us. :D


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 Post subject: Re: fan use
PostPosted: 30 Oct 2009 22:33 
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Joined: 02 Sep 2009 10:18
Posts: 80
Location: ByronBay, Australia
Hey hey i'm back!!

Nice topic and as such i have a couple of photo's for you.
This is my scratch built PushyCat, well i was given the wing and some plans, but this is what i have so far..
I think i will have to re-name her!! :lol:


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VON

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 Post subject: Re: fan use
PostPosted: 30 Oct 2009 23:05 
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Joined: 02 Sep 2009 10:18
Posts: 80
Location: ByronBay, Australia
Hi Jordan,

I think you could definitely install your fans under the wing, you would just have to really think hard on how you would mount it there. Strength V weight is obviously most important apart from setting up your incidences or degree's of. See in your mount you would want to be able to make fine adjustments to the position of the fan to balance them. This is the tricky part, I am still learning this so i will not offer any advice there :lol: But i'm sure without naming names (KILOP) 8-) there will be someone who has an idea on how to set up these paramters. Mine so far are trial and error, i have taken into account the incidence of the origional and gone from there.

Anyway good luck, and i reccomend using foam to surround the fan unit, that way you can mould it to the shape you need.. ;)

Von

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 Post subject: Re: fan use
PostPosted: 31 Oct 2009 00:34 
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Joined: 05 Aug 2009 02:18
Posts: 287
Jordan and the gang :P

It is nice for me to see many participants in this thread.

Admittedly we are not discussing a beginner's subject.

From the first posting, nothing is said about the type of plane. It only mentions the use of these fan motors under the wing(s). So all I could say is make it light and if it does not work (not enough thrust) the plane is not lost. More thrust can be achieved by switching to motor and propeller.

My understanding is that Jordan is working on his own model design and is not a beginner.

There are tricks in design to achieve a satisfactory performance of a new model in which the forces acting on the model can be compromised.

In straight and level cruise at partial power the forces have to balance in amplitude as well as in rotary momentum. Extra power has to exist to provide climbing.

Personally I like a balance such that adding power automatically result in a climb and reducing power automatically result in a descent. That is not essential particularly if the model is to be fully aerobatic and never flown in straigth and level.

I have to assume that Jordan is enjoying whatever he is doing or planning on and has the basic theory to guide him along.

I have seen some design guidance on the internet but I do not endorse the idea of "copy typical models known to fly nicely".

How well a model flies is very relative to who makes that judgment and his ability as a pilot.

I would dare say as well "the quality of the training received".

I think I am getting out of topic although I do not see the topic of this thread being well defined.

For sure two fans under the wing(s) will provide some thrust. We do not know how much thrust which led me to suggest to make the model as light as possible. Always a compromise to strength.

Nuf sed . . .

KILOP


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 Post subject: Re: fan use
PostPosted: 04 Nov 2009 15:23 
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Joined: 18 Mar 2008 10:53
Posts: 893
Location: Southern Spain
Nice scratchy, Von! I take it you haven't had it airborne yet, or are those pics post-crash? :P
I wouldn't mind getting in to EDFs myself. I've got my eye on this little baby for when it's released, although the price is a bit steep and I might have trouble justifying a purchase... :?

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Pete


Pete's site is RC Airplane World
- a complete beginners' guide to RC flying!


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 Post subject: Re: fan use
PostPosted: 07 Nov 2009 10:24 
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Joined: 02 Sep 2009 10:18
Posts: 80
Location: ByronBay, Australia
Hey there Pete, Cute little baby mate!

About the Pushycat, a guy down the club gave me the wing so i guessed he crashed it but he gave me some plans and as it goes i just used what i had laying around at the time. It probably does have enough thrust from the 64mm :lol: but i'm keen to get back home and finnish sand so i can paint it..

I will try to get some u tube action of her maiden flight if i can, also post final pics whens she's ready..

The ParkZone EDF looks great! I might have to put that 1 down for christmass i think ;)

Regards
Von

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