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Old Oct 07, 2012, 03:22 PM
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F35 vtol from italy

Hello, I have made ​​30 flights a complete transition from vertical to straight, to improve directional control in hover I added a mini fan 27 mm at the rear. C is someone who has done something similar with a fan?

F35 VTOL FLY (1 min 22 sec)
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Old Oct 07, 2012, 05:08 PM
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Great job!

So there is just one main ducted fan and one mini fan for pitch and yaw control?

It looks like there are vanes under the main fan. What do they control?
Anyone that has tried this type of transitioning VTOL craft knows it is not easy.

Congratulations on a fantastic project!
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Old Oct 07, 2012, 06:26 PM
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The flight is assigned to the main fan, vettorabile in 2-axis swivel and 3 positions 0, 45 and 90 . a small fan 27 mm is placed in the queue and serves only for the control of the directional hovering
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Old Oct 07, 2012, 06:49 PM
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Originally Posted by f35vertical View Post
The flight is assigned to the main fan, vettorabile in 2-axis swivel and 3 positions 0, 45 and 90 . a small fan 27 mm is placed in the queue and serves only for the control of the directional hovering
Do you think it is possible to remove the 27mm fan and use the vanes for yaw control?
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Old Oct 09, 2012, 01:04 AM
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I tried but the command in the stream carried away too much importance to the fans and was ineffective. Excellent system is to take a portion of flow to the fan with a tube of depron Please install a valve and a flow diverter for use as yaw control for hovering. see photos
I send you also a test drive with the model controlled by the tube depron visible under the fuselage, facing forward. The system is best for very low weight but less effective than the minifan. Moreno

F35 Vtol - From Vertical Take Off to Horizontal Flight di Moreno Lippi (1 min 8 sec)
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Old Oct 10, 2012, 04:12 PM
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Very very nice
You are very good! congratulations

How long can you hover ? 3 mn ?
Do you use a 70mm EDf? Which battery
What is the weight of the model ?
Thanks for the answer
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Old Oct 11, 2012, 01:23 AM
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Thank you, range 2 to 3 minutes, total weight 900 grams, 70 mm fan. gens 2250 battery 4-cell, 58 ampere consumption in hovering.
Moreno.
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Old Oct 11, 2012, 11:26 AM
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Originally Posted by f35vertical View Post
Thank you, range 2 to 3 minutes, total weight 900 grams, 70 mm fan. gens 2250 battery 4-cell, 58 ampere consumption in hovering.
Moreno.
May i ask how can the 70mm edf push more than 1kg?

I got a 70 mm edf with 5 blade using 4050 kv with 4s cell 14.8V but can only push
till around 700g my whole plane (F-35) weight around 900g~ can't even modify it to VTOL f-35......

Do you have any suggestions for me to make improvement?
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Old Oct 12, 2012, 12:27 AM
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I've tried a lot of fans on the bench for more than 1 kg of thrust to be put in a cell more. I have fans with 3700 kv motor that gives me 1450 g thrust at 62 amps. Important not to make long flights otherwise burn the motor. Important to use good batteries, often after the first 5, 6 flights get older and do not raise more than the floor model! Take a test stand and controls thrust and consumption in watts. Moreno
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Old Oct 13, 2012, 07:04 AM
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Very beautiful!
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Old Oct 13, 2012, 10:49 AM
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Do you know any website talking about duct fan, how to choose good blades with corresponding to motor?

Since i have totally no idea where to find them......
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Old Oct 13, 2012, 03:22 PM
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I do not know, I have done many tests whereas now the aeromodelling materials are cheap. 25 years ago it was different, everything cost so much and what they bought had to be good for strength ....
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Old Oct 13, 2012, 04:00 PM
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Good job.
What flight controller are you using?
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Old Oct 13, 2012, 04:51 PM
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Ursel, Belgium, Europe
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Quote:
Originally Posted by happysamuel View Post
Do you know any website talking about duct fan, how to choose good blades with corresponding to motor?

Since i have totally no idea where to find them......

You can find a lot here: http://www.jepe.org/indek.htm


Dirk.
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Old Oct 15, 2012, 10:08 AM
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To: f35vertical

I would like to ask how did you derive the equation of motion of your f-35 since there are problems on the rolling and pitching problem due to disturbance from environment during hovering...

It is really a big problem to deal with, as you only got 1 edf to hover your plane...
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