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-   -   Any fan powerful enough for this plane? (http://www.rcuniverse.com/forum/electric-rc-jets-198/11337406-any-fan-powerful-enough-plane.html)

bem 12-19-2012 11:53 AM

Any fan powerful enough for this plane?
 
1 Attachment(s)


Hi,

I have been thinking some years about this SAAB J-29 "flying barrel" in scale 1:4.8 below but where I fly it is grass and rather dry so a kersoene turbine is not the best choice for fire/safety point of view. So I have been thinking that maybe there is some electric fan solution out there for a model this seize/weight.

Can You guide me in some direction where a fan suitable for a plane like this can be found?

Two images of the plane below.

Reseller website of the plane (most in German):

http://www.der-schweighofer.at/en/pr...ll-gfk_2300_mm</p>

Tab Technical Specifications:</p>

Wingspan: 2291 mm (90.2 inch)
Length: 2130 mm (83.9 inch)
Weight approx: 12-14kg(26-30 lbs)
Fuselage: Glass
Wing: Glass
RC functions: Aileron, elevator, rudder, flaps, throttle, retracts
Recommended turbine: JetCraft J90+, JetCraft J130+
Scale: 1:4,8</p>

Designer/manufacturer website:
http://manfred-eberhard.magix.net/website/
(only in German)</p>

Flying video of the model, 0:27 min -&gt;:
http://www.youtube.com/watch?v=nakiUXTfmbE

Some facts and flying videos about the full scale plane:
http://www.youtube.com/watch?v=YD22i7Y8wHg
The full movie of J-29 in film "Yellow squadron" (just skip the non flying parts):
Part 1: http://www.youtube.com/watch?v=h-T_qCByeQY
Part 2: http://www.youtube.com/watch?v=57FHSdFq2eA
The onlyJ-29 that isflying even today:
http://www.youtube.com/watch?v=k0W0TF9nX1k


Thank's
Bo
</p>

Dayaks 12-19-2012 03:30 PM

RE: Any fan powerful enough for this plane?
 
I'm no expert in large EDFs, but I would definitely at least check out the DS-94-HST.

mongo 12-19-2012 03:59 PM

RE: Any fan powerful enough for this plane?
 
36+ pounds of aircraft on a single powerplant.
TF8000 comes to mind. search here and rcg to find some thread in the last year about some high powered options with it.

bem 12-20-2012 02:32 PM

RE: Any fan powerful enough for this plane?
 
Thank's Dayaks and mongo for the suggestions.

When You see this video below of a similar size and weight model, a Hawker Hunter, with a Sch&uuml;beler DS-94-DIA HST with DSM6745-700 motor and14 cellLiPo batteries (14 cell 2 packs in parallell, ThunderPower 65C)I'm kind of convincednow the J-29 flying barrel model above would also fly as good as the Hunter with such setup:

http://www.youtube.com/watch?v=p0IdCO6nb0s

The Hawker Hunter in the video has a weight of 16 kg (35 lbs).
http://www.schuebeler-jets.com/en/ai...hunter-en.html

In the photo gallery one can see two pictures of the fan installation in the Hunter:
http://www.schuebeler-jets.com/en/ai...k-sonnier.html

Sch&uuml;beler DS-94-DIA HSThas a thrust range 100-130N and that is about exactly what is recommended for the J-29 model (since the turbines recommended are JetCraft J90+, JetCraft J130+).

The J-29 model would probably be little lighter (12-14 kg / 26.5-30.9 lbs) then this Hawker Hunter 16 kg (35 lbs).

Another rather convincing video, Italian C&amp;C Models BAE Hawk that is about seize and weight(slightly smaller and probably little lighter) as a J-29:
http://www.youtube.com/watch?v=srkDHNXt-BI
http://www.youtube.com/watch?v=g5L83p-YZr8
http://www.cmodels.it/modelli_jet/baehawk%20c&amp;c.htm

I did know it would not be cheap to get a model this seize airborne with fan solution but a turbine is not cheap either. One, at least me, would probably only afford one setup of batteries for suchairplane.

What do You think - would You select a Sch&uuml;beler DS-94-DIA HST with 14 cell Lipo for theJ-29 model? If not, why?

If anyone has a suggestion for abetter fan then a Sch&uuml;beler DS-94-DIA HST for a plane like the J-29 please post suggestion(s).

/Bo

bem 12-26-2012 06:31 AM

RE: Any fan powerful enough for this plane?
 
Hi,

I contacted Schübeler and they said DS-94 HST with DSM 6745-700 on 14S should be a good option for this J-29 flying barrel plane but they asked at the same time for the seize of in- and outlet on the plane so I will try to get info on that.

/Bo

molo_30 12-26-2012 01:31 PM

RE: Any fan powerful enough for this plane?
 
Certainly a model only its mother could love....

bem 12-27-2012 02:49 PM

RE: Any fan powerful enough for this plane?
 
Hi molo_30,

J-29 flying barrel is perhaps not the prettiest plane, it was said it was "an ugly duck on the ground but a swallow in the air". But for me living in same country these J-29 was made and flown it is kind of the historic background also that makes it more interesting. I meet a person last spring that flew J-29 so there are still persons around that flew these planes in active service.

/Bo

edwarda10pilot 12-28-2012 07:48 PM

RE: Any fan powerful enough for this plane?
 
bem:

Take a look at this link.
http://www.rcgroups.com/forums/showthread.php?t=1672980

It is for Kirk's large Hawker Hunter. PM the original poster (gunradd) and ask him for contact info for Kirk and speak directly to Kirk about performance. I also believe that he was at Jets over Kentucky (USA) this year so if you do a search on the event there are photos and might be a video of the plane flying on a Schubler 94HST on 14S. I saw a video and it was very impressive.

Ed

Dayaks 12-29-2012 07:15 AM

RE: Any fan powerful enough for this plane?
 
How loud is the DS-94-HST? I am very close to purchasing one but am a bit concerned about sound levels.

Extreme_RC 12-30-2012 03:32 AM

RE: Any fan powerful enough for this plane?
 
1 Attachment(s)
My new EXTREMEAlloy 127mm Ramtec fan will produce 22lb thrust on 14 cells, fan weight is 1080 grams all up with motor cover ready to install. May be an option to consider, the fan is $499.00 complete with motor ready to install. It runs an HET 800-73 series inrunner, extremely powerful and very efficient. I saw 21lb thrust with old 5000mah packs, 145A, with new larger capacity battery setup 22lb+ will be easy.



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