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HomeAircraftHelicopterGasser Model RC HelicoptersOther › Electric Fan on a Gasser
04-06-2010 11:33 AM  8 years agoPost 1
brw0513

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Brisbane, Australia

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I see Compass claims a 15% increase in power for the Odin, based on not needing a fan driven from the crank - rather an electric fan run by an ESC.

If 15% is a real figure, why don't gassers use this idea to close the gap in power to nitro engines?

Ian B

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04-06-2010 12:41 PM  8 years agoPost 2
KopterKat

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New Jersey

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I would love to see the calculation for this claim, and how they measure it.


FlipMode Squad

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04-06-2010 12:59 PM  8 years agoPost 3
brw0513

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Brisbane, Australia

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I'll do some research to see if I can find a relationship between speed, cfm and power.

I would not be surprised though to see the types of fans used in most heli applications (radial or nearly radial blades) as being very inefficient.

Ian B

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04-06-2010 01:10 PM  8 years agoPost 4
Justin Stuart (RIP)

rrMaster

Plano, Texas

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How about using a PUM motor and a small radiator?

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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04-06-2010 02:15 PM  8 years agoPost 5
BeltFedBrowning

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Kansas City

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Then you would have to run a fan and a water pump. It would take more battery than just an electric cooling fan. Sure would be cool, though!

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04-06-2010 05:27 PM  8 years agoPost 6
SuperSixTwo

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Virginia City, NV ---USA

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I dunno about 15%, but i have seen a trex 700 that went to electric cooling. It does add power. Cooling seems to be enough to keep it at 110c during hard flying. Temps drop fast as soon as the flying turns more scale like. I dont think the fan for the 90 would cool a gasser, perhaps a ducted fan from a importer for a foamie would do it.

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04-06-2010 08:06 PM  8 years agoPost 7
Justin Stuart (RIP)

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Plano, Texas

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I've got a generator on my gasser that could probably run an electric fan and a water pump without too much effort. Probably not worth the trouble, however.

Avant RC
Scorpion Power Systems
Thunder Power RC
Kontronik Drives

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04-06-2010 08:11 PM  8 years agoPost 8
pgkevet

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Wales

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How about using a PUM motor and a small radiator?
Super idea..lose the fan completely, run one of those DIY drill waterpumps instead of the fan and lay out a radiator of pipes over the canopy..Gold tubing should be nicely conductive and bling

...or a turbine on the TT and run a coil back around the boom

pgk

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04-06-2010 08:52 PM  8 years agoPost 9
rbort

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Franklin, MA - USA

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Radiator over the canopy...yeah!
I can see that now, and God forbid you put it in, you'll get alot of steam! Next subject of discussion will be, which type of antifreeze is best?

-=>Raja.

MA 1005 Hanson 280, 4210 flts
Spectra 27 3DMax, 3280 flts
Whiplash V1-2 Hanson 300, 1555 flts
Whiplash V2 Hanson 300, 393 flts

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04-06-2010 10:04 PM  8 years agoPost 10
Markus

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Montreal

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04-06-2010 10:30 PM  8 years agoPost 11
BeltFedBrowning

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Kansas City

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I never thought about using a heater core for a radiator!

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04-06-2010 11:41 PM  8 years agoPost 12
smallplanes

rrElite Veteran

S.C. ,SSA

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Why not throw your balls up there to cool it,it cold work.haha


Spectra G 26cc
Jewel
Bat 27cc
Trex 700<br

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04-07-2010 01:09 AM  8 years agoPost 13
brw0513

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Brisbane, Australia

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Hmmmm. Another thread gets sidetracked. All good fun though.

If I do find anything re "mechanical radial" fans vs "electric axial" fans then I post about it.

Ian B

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04-07-2010 06:39 AM  8 years agoPost 14
SkySurfer

rrApprentice

usa

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On my old Trex 700g 26cc gx gasser i removed the cooling fan "predator" and installed a GWS EDF intergrated with the Carbsmart controller with a esc. As the engine would warm the edf would turn on and ramp up or down depending on the engine temp. Everything was set through the carbsmart interface.This system provided better engine temps with diffrent loads and outside temps.Also it would shut off after the engine would cool down. And yes it provided a big increase in power and allowed the engine to respond faster and rev higher due to the lack of spinning that monster predator fan. Remember this is the same reason why they did away with mechnical fans on cars years ago. People told me here on Runryder that i was crazy and didn't know what i was talking about. But they never tried it for themselves. You will need a manual reset limit switch embedded in the head in case the edf fan craps out. Or you can use the venom temperature failsafe unit, that will cut your throttle to a preset position if the engine gets to hot. Im still debating on converting my MD500 scale Radikal to this system because it worked really well on the Trex700g. I was using a 2s 5000mah pack to power the servos,ignition,and edf. I think the jewel would work great for this. The edf only uses 8-10amps. Also the heli sounded cooler than sh@t, when the edf would ramp up

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04-07-2010 07:28 AM  8 years agoPost 15
shawmcky

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Isle of Wight,United Kingdom

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People dont like a change from the norm
Electrics can fail at any second,whatever next,they will be making electric helicopters before you know it,If you have had success with your system,good on you and keep up the good work.No doubt you could probably hear if your EDF stops in flight.I know if my engine does as well.Do electric motors such as EDF fail in flight much these days,if not,then if it cools your motor as well as or more efficiently than a mechanical and gives a power boost,why should there be a problem with a "different" system.

Team- unbiased opinion.K.I.S.S principle upheld here

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04-07-2010 10:57 AM  8 years agoPost 16
brw0513

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Brisbane, Australia

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SkySurfer,

I don't think you are crazy - I tip my hat to you buddy. Nice work with the EDF set-up. I hadn't been thinking so grand but there is no reason why the fan couldn't be arranged to be variable speed with some form of safety net back-up. It might also be a good option to simply have different fan speeds for each flight condition.

I did find what I thought to be a candidate fan. It's a SUNON Maglev Motor Fan, 70mm square case mount, 15mm thick, 5V, 0.2A, 1.0W, 23CFM at 0.09 in H2O, 52g. Looks good to me. Reading the blurb on the website, it seems the motor is a 4 pole brushless design, but the diagram only shows two wires

The other thing that is firming in my mind is that radial fans are not all that good at moving air compared to the axial design.

I can't see why a 5V brushless fan set-up with an onboard generator is a bad idea.

Ian B

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04-07-2010 11:03 AM  8 years agoPost 17
shawmcky

rrElite Veteran

Isle of Wight,United Kingdom

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Whatever next,150 m.p.h electric motorcycles?

(I think they nicked that idea from "Tron"though)

Team- unbiased opinion.K.I.S.S principle upheld here

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04-07-2010 01:12 PM  8 years agoPost 18
shawmcky

rrElite Veteran

Isle of Wight,United Kingdom

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Yes 150 m.p,h electric bike
Uses a fan on a 26cc Zenoah engine to cool it,did a genuine 150 m.p.h till it ran out of lead and pulled the plug out.

Team- unbiased opinion.K.I.S.S principle upheld here

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04-07-2010 01:14 PM  8 years agoPost 19
rotaryfalcon

rrApprentice

S.E. USA

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Been going through the "fan thing" to get increased air flow for a 4 stroke heli I am working on. I am certainly no expert on the matter. I have read tons on centrifugal fan design and it seems the straight blade radial fan is best sutied for RC heli use, moves more air at a lower pressure which is good for engine cooling. The thing is it is also the biggest power consumer. Modified radials and airfoiled fans are quiter(who cares) and use less energy. That why you see most heli fans with curved blades. However after looking a pics of the existing fans out there and the latest patent drawings of recent fan designs not all helis fans are well designed. All that beibg said the axial fan is a prime mover of air. It pretty much has to blow straight, as in right down on the cylinder and head, begins to loose effiency if forced through a shroud. Seems like a well placed EDF would be the ticked except they consume a ton of energy, may not be an issue with an onboard gen. The system mentioned in the Trex 700 sounds perfect with a gen system. I strangely have been looking at fans similar to the SUNON fan to ventilate the engine compartment of my sailboat, they are basically a computer cooling fan, sone advertised as high as 78cfm. Dont thing there is enough capicity there.

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04-07-2010 01:27 PM  8 years agoPost 20
Against Gravity

rrVeteran

Pottstown PA

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EDF Cooling
SkySurfer Is A man that is thinking ahead, his ideas are great. I would love to have seen that setup.
For scale guy's it would solve allot of problems I am sure. Add the cool sound and it could catch on.
You should team up with Raja and make a few for sale.

AG

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