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Old Dec 21, 2014, 09:35 AM
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J-35 Draken AeroTetris/Bukvorez

hi
We are starting a new development J-35 Draken
lenqth 2000mm
Best regards, Egor
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Old Dec 22, 2014, 03:08 AM
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Hi Egor!

Hope you get some christmas and not only a lot of work for us all out there.

Do you think you can add 2 drop tanks as well? If flying this as a hand launcher it is perfect to belly land it on the tanks.

Se the movie of me flying my F100, and hand launching it. I guess the Draken will weigh about 3,5 kg, at most, flight ready.

F100 Super Sabre (HD) EDF Jet (6 min 57 sec)
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Old Dec 22, 2014, 06:09 AM
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hi Mankan
Thank you for your congratulations
merry christmas!!!

First, we draw the model and cut it into parts.
If there is free space, we do stand or fuel tanks.

Regards, Egor.
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Old Dec 22, 2014, 08:21 AM
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Some interesting Draken movies:

The Saab 35 Draken at Wing F10 Sweden.mp4 (5 min 54 sec)


First to do the Cobra?

Saab J35 Draken trainers doing the Swedish Cobra Maneuver (3 min 8 sec)


Nostalgic film:

Saab J 35 Draken, 1960 (3 min 38 sec)


More nostalgia:

Saab J35 Draken Marketing video (9 min 55 sec)


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Old Dec 23, 2014, 12:17 AM
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hi guys.
length 2000mm
show please approximately (+-50-80mm) where you will install the 120mm EDF
Regards, Egor
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Old Dec 23, 2014, 02:49 AM
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Quote:
Originally Posted by qwerty1000 View Post
hi guys.
length 2000mm
show please approximately (+-50-80mm) where you will install the 120mm EDF
Regards, Egor
Well, I am not 100% sure but I think it is a good idéa that the intake channels not curve to much. As on the real plane (wich I have worked on). The marked spot is what I suggest.

However, this is an EDF, not the full scale plane. So others might know better.
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Old Dec 23, 2014, 02:43 PM
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deltas are cool
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If the fan is too far back the batts will end up in the cockpit.
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Old Dec 23, 2014, 04:24 PM
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Where should the CG be, any ideas?
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Old Dec 23, 2014, 05:30 PM
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The CG is just forward of the point where the wing "steps out", essentially just forward of the main landing gear. Here's a picture from someone's scratchbuilt plans. I flew my HK 90mm Draken slightly further forward that what is shown in this picture. It was better on the nose heavy side of the CG range. Approaching the tail heavy side of the CG range would tempt a very nasty stall during turns.

Please also choose an airfoil with a good amount of reflex in the trailing edge.
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Old Dec 24, 2014, 02:31 AM
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Ok, the fan should be a bit more forward than I suggested? Not fun to have the batterys as long forward as possible.
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Old Dec 24, 2014, 03:34 AM
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Im looking for draken 1200-1400mm legth and 90mm fan.
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Old Dec 24, 2014, 03:47 AM
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may be...?
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Old Dec 24, 2014, 10:40 AM
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That is the position of the 90mm EDF in my Draken on 6s 5800. It also appears to be similar in position to Claus' 70mm Draken flown earlier this autumn. I'm looking at the rear of the fan shroud: I'm imagining the forward lip of the fan shroud will actually be slightly further forward than this picture, because the red fan shroud outline is not to scale.

With the narrow dimensions of the cockpit area, perhaps a better approach would be to measure the largest width in the cockpit area and the area behind it. This will determine the placement of the battery. Knowing that location in the front, then position the fan to correctly offset that weight in the rear. An 8s pack would be able to fit further forward, requiring a fan further back. But large packs, for example 12s, would likely sit further back, requiring a fan further forward.

In any case, I think we can agree that the battery would not be situated on the main landing gear.

An adjustable-depth duct for the fan mount may be a good idea as well. Adjust the fan's position instead of adding dead weight.
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Old Dec 24, 2014, 10:54 AM
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Moving the fan too far forward would require the battery to move back, which would put it near the gear, where the ducting is converging. Not good.

Consider the Mirage and Eurofighter for comparisons of fan/battery placement on different deltas. The bifurcated duct of the Mirage is closer.
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Old Dec 24, 2014, 02:06 PM
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deltas are cool
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Start your cg 1" fwd of the wing break.with all the servos and a tail retract that last pick has the fan too far back.ck my scratch build I did from clausxpf's scale drawings....my fan is too f as r back so move fwd a couple more inches.lots of pics in that thread.plane flew very well.
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