Small Ducted Fan Question
 

Hello,

Is the Toki Fan unit the best you can get out of a 90mm fan setup?

Is there a fan/engine setup that will produce 4+ lbs. of static thrust and do it with a 90mm fan?

I am limited to this size and I am trying to find out what setup will produce the most static thrust on a 90mm fan. Any ideas or suggestions would be appreciated.

Thank you,

Jerry

RE: Small Ducted Fan Question
 

Hi Jerry,

The Kress Fan unit (for .21-.25) will do 4 lb of thrust. The diameter is about 3.5" (90mm). Although they are quire expensive ($140 for the fan unit alone+ engine). Do a search on RCU for Kress' phone number. They don't reply to email to often anymore.

Russ
Oakdale Aircraft
www.oakdaleaircraft.com

RE: Small Ducted Fan Question
 

Hello,

Thank you Russ for the information on the Kress fan. Which engine would you suggest for the Kress fan (OS 25, K&B 3.5, other) ?

Thank you,

Jerry

RE: Small Ducted Fan Question
 

Schubler(spelling) fan (90 mm) will do 7 lbs of thrust at 42,000 RPM. Now it is electric only. The 90 mm EDF usually out performs their glow conterparts. Even a WeMoTec Midi fan ( 90 mm) will produce 3 to 4 lbs of thrust on 16 to 20 cells.:)
Bob

RE: Small Ducted Fan Question
 

Hello Bob,

Thank you for the information. I have looked at going with EDF. But the price is just to high.

I belive you were talking about:
Schübeler
http://www.schuebeler-jets.de/

The DS-51-DIA 3-ph fan unit is incredible. But my setup would require two of them. And this would put the price at over $2,000 when you include the fan, motor, esc and cell packs. I could go with a turbine for that price.

I also received a suggestion for an edf setup of 4 Midifans and Mega 22/30/3. When you include the 60 cells and ESCs this is still more expensive than a Toki setup.

If I were to use 4 Toki units, that would be about $760.00. But I don't want to try and fit 4 units and try to sync them all. So I am still looking at glow options and keeping the cost below a turbine.

I am trying to find the most efficient setup that will get a 18 to 24lb aircraft in the air. The design of the craft limits me to a 90mm fan. But I have an engine compartment width of 16 inches to work with.

Thank you,

Jerry

RE: Small Ducted Fan Question
 

i have an os 25 vfdf engine acualy i have four of them if you find a fan and would like an engine let me know i also have a new in box K&B 3.5 df engine i love the little fans and have almost everything for them ecept the 90mm fan i sold it

RE: Small Ducted Fan Question
 

Hello,

Thanks for the offer. If I can find a good deal on 3 25 size fans I will contact you about your engines.

Thank you,

Jerry