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Electric Ducted Fan Jets Discuss electric ducted fan jets here including setup tips, power systems, flying techniques, etc.

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Old 07-08-2006, 08:07 PM   #1
warbird@home
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Default Lockheed U2

Would really like to build one....seems like it would be ideal....

Any kits or planes or ....well anything ??? about 6ft span?
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Old 07-13-2006, 07:46 AM   #2
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Hello,
I'm searching plans or kit for a RC U2 spy plane of about 6 ft. minimum wingspan (but I can increase plans with photocopy).

Did you already saw something like that in a shop in the US or anywhere ?
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Old 07-13-2006, 08:47 AM   #3
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Default found one.....

I got no replies on this thread either so I have ordered the one from here ...looks wonderfull, should convert well to WeMoTec Ducted Fan and brushless motor...........

http://www.goetz-gfk-modelle.com/

good luck
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Old 07-13-2006, 07:09 PM   #4
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Yes, or why not a Jetcat P60 small turbine engine ?

(do you know the diameter of the fuselage ?)
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Old 07-13-2006, 07:10 PM   #5
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Originally Posted by guantanamo king View Post
Yes, or why not a Jetcat P60 small turbine engine ?

(do you know the diameter of the fuselage ?)
Thanks for the info
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Old 07-13-2006, 08:02 PM   #6
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Originally Posted by guantanamo king View Post
Yes, or why not a Jetcat P60 small turbine engine ?

(do you know the diameter of the fuselage ?)
I will go for the d/f Lipo option, not sure about turning the jet off in flight !! My aim is to have a 'powered glider' sort of thing...but scale !!

I'll drop you a line with details as soon as the plane arrives......should be next week sometime....
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Old 09-18-2006, 08:57 PM   #7
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Hi,

just found this post. I'm also looking for building plans of the U-2/TR-1 for a scratch build. The only thing I've found up to date are from 'Warpaint'. Two drawings 24" x 17", one is the U-2, the other U-2R/TR-1. Span on the U-2 is approx 13" and the other 17" (1/72).

For a true scaler, with the amount of detail that's shown, they are imperative but I don't imagine that 100% copy of the wing profile will help.

I found these plans in the IN and had them shipped from the States. Can't rememder who the supplier was but if someone has interest I could seach back in my notes.

I will try to upload photos of the plans but please don't expect too much as the sheets are not under glass so there is fold distortion. The flash has blued the prints but at least you can decide if it's for you or not.

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Old 09-20-2006, 02:29 AM   #8
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GWS is coming out with one.
Bob
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Old 09-20-2006, 02:39 AM   #9
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Lanier has a U2 glider that some folks have converted to R/C pretty easily. little extra work and they look stellar!

http://www.lanierrc.com/lrcprivate/r...ightglider.htm

Owner of the Atomic RC Workshop.

The Flying part is easy.... it's the landings that will do you in. :p
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Old 09-20-2006, 06:27 PM   #10
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Hi Bob & Joe,

thanks for the tips but 'eyes lukin for plans not planes'.

@ Bob. Where did you get your info. about the GWS model? Didn't find anything in the IN

Regards. Karl.
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Old 09-21-2006, 07:36 AM   #11
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See http://www.rcgroups.com/forums/showthread.php?t=560840 for more details and pictures.
Bob
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Old 09-21-2006, 11:57 AM   #12
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Thanks for the info Bob, got to admit that it's a good looking a/c but a bit small. I'm planning on 2.5 to 3 metres (98" - 118") but I'll keep it in mind. Rgds. Karl.
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Old 10-05-2006, 05:34 AM   #13
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Hi;

I am in the taxi tests of my own designed U-2. here are some pictures. I used a book published by Aerofax Inc. ISBN 0-942548-43-4.


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Old 10-06-2006, 10:36 AM   #14
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Hi cetorca,

welcom to the WattFlyer, and thanks for the link.
Now that's what I call a great looking model, I'll PM my address and you can ship it to me as soon as the bugs are ironed out.
How about some tech details? Have you maidened her yet?

Regards, Karl.
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Old 10-06-2006, 09:14 PM   #15
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Hi Karl;

Thanks for your reply, I designed it in AUTOCAD and then build the fuselage using balsa strips covered with fiberglass cloth. The wings are balsa covered foam and monokote. It has own designed retracts and the wing pogos are ejectable when landing gear is retracted. the ready to fly weight is 95oz and the propulsion unit is Kontronic fun 480-33,Hackermaster70opto, TP4s2p400. Today I got 900 gr of static thrust wich becomes about 30% of AUW. Enough for such s big wings.
I have not maiden yet. I have just tested the taxi behaivior where I found some issues with the rear landing gear which I am correcting right now. I dont know when the first flight will be done. I hope not to far from today.

Please see more info on this airplane at:

http://www.rcgroups.com/forums/showt...t=488966&pp=15

Good look with your project. I will keep you updated on mine.

Cesar.


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Old 10-07-2006, 11:49 AM   #16
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Cool

Hi Cesar,

thanks for the info but I'm still curious.

The last shot that you posted makes the a/c look even more imposing. I've changed my mind about sending the model to me after you've ironed the bugs out, send it NOW. This is about the size of model I would like to build. The bigger the better, but I must remain within a 5 kg legal limit.

Concerning the wings. How far have you deviated from the original with respect to the lenght, cord, etc.? Once you mentioned that the pogo u/c would be detached by gravity and another time you quoted that they would be ejected. If they fall off through gravity then there is the danger that they would fall off during taxiing, how have you solved this problem? I had planned to use a pogo u/c and at the same time have a second set disguised in the slipper tanks for landing (see 56-6692 in the site that you gave me). Are you using flaps and/or air brakes?

When do you think that your plans will be finished? I'd love to have a copy, all expences incured would be reimbursed of course. Sorry for the overload of questions but I need all the assistance I can get in order finish my planning.

Regards.

Karl.
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Old 10-07-2006, 11:08 PM   #17
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Karl

After the first flight I will send it to you. I do not want to send you without maiden.
The Wing and tail are planform scale, the wing airfoil is RG15. I run some stability calculations and the tail will provide good control being scale. Since my main concern was maximum thrust and minimum weight without sacrifing scale, no flaps or speed brake were added. I planned to achieved a Thrust/weight ratio around 30%. Finally I got 32%.

The pogos are ejected via springs inside the wing actuated by wires inside the wing as well pulled with the gear servo when retracted. The option to conect or let them disconected is available when assembling wings at field.
Initialy I considered gravity but as you cuoted, the risks of falling at taxi speed or not have them available for landing make me reconsider this option.

Did you get the GWS U-2, are the tail planforms scale?

About the plans I have to make them readable for others and then I let you know.

Regards.
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Old 10-08-2006, 12:35 AM   #18
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Hi Cesar,

no I didn't get the GWS U2, as I quoted in an earlier post, it looks very nice but it's a bit on the small side. I don't even know if the GWS is on the market yet. Kits and ARF are not my thing. I like the challenge of producing my own products. I get what I want and I don't have to comprimise with what's supplied. This is the reason I'm picking your brain, gleening all the info that I need bt don't yet have.

I'm aiming at a 2.5 to 3 metre model but were I fly here in Germany we are only allowed electric propulsion and a max of 5 kg AUW. Up until December last year we had a runway, a real one, but the local council have banned us to a long grass area. This is the reason I said that I had planned a pogo u/c, but what use is an u/c in a long grass area?

When do you expect to maiden your kite? I wish you all the best and hope that all goes well, don't you dare mess up my beautiful a/c.

Regards.

Karl.
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Old 10-08-2006, 01:19 AM   #19
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Lanier models here in the USA makes a very good 72" WS---U2--- foam glider. If you like I can post the website. $29.00 in the usa.

I modified it to a powered model.
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Old 10-08-2006, 01:32 AM   #20
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Hi Cyclops,

thanks, but I've looked at this one. It's semi scale and only 1.82 metres and I'm aiming at 2.5 to 3 metres.

How did your's work out?

Regards.

Karl.
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Old 10-08-2006, 06:20 AM   #21
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It is a fantasticly stabile plane in wind. Sink rate is faster than average due to the small horizontal stabilizer. Rounder scale fuselage and it is real.

Do not paint it Aluminum and take your eyes off of it.

I know what happened next.

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Old 10-08-2006, 06:27 AM   #22
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So it seems that BLACK is the colour with my eysight.
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Old 10-08-2006, 06:47 AM   #23
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At 68 years, I do not reacquire planes at high angles as quickly with wind noise levels elevated.




But I can run to the crash site just as fast.
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Old 10-08-2006, 08:07 AM   #24
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Well you've pipped me by a couple of years. I'm retired but I wouldn't say with time on my hands. Are you also from the era of single channel 1lb rxs and rubber powered crank handle driven rudders?

I've never bought a kit, except for converting rubber powered scale free flight kites to fly with Cox Peewees (those thimble sized things with spring starters), but have always built from scratch. I have bought a RTF, an egg beater. Could you find it in your heart to forgive me? :p

Rgds. Karl.
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Old 06-10-2008, 12:20 PM   #25
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Default U2 - update

I have found a set of scale plans in an early Flying Models magazine - published feb/mar 1964 looks to be around 6 foot span - I dont know if they are still available but might pay to check - I will be happy to provide a scan of the plan if needed -just ask . mail me

UPDATE - have attached JPG scans of the relative article and plans from the Flying Models magazine referred to - can supply as PDF - which you should be able to scale - if wanted ( but to big to post here ) - cheers , Ross


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