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Old Dec 14, 2011, 08:38 AM
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United States, TX, Grand Prairie
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Quote:
Originally Posted by hommel View Post
To be honest, I don't think this is a poor design... I think Extreme_RC showed us that...
I agree He got wemo numbers on 6s here (link)...
I get the same amount of thrust to watts on calculated (not actual) RPMs than my wemo and SAPAC fans

It doesn't matter if he was running 12s to get the number the numbers the point is it can be done and CALCULATED rpms and amp estimates can be take from there.

The motor I'm using is slightly shorter can than an MB1 but give same thrust on 4s but comes down pretty warm...knowing that I know NOT to go to 5s on that motor with this 10 blade fan.
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Last edited by erh7771; Dec 14, 2011 at 09:37 AM.
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Old Dec 14, 2011, 09:36 AM
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Quote:
Originally Posted by hommel View Post
......
This is exactly what I see, the thrust to watts is not as proportional as a wemo...you can't go to 6.5lbs of thrust on this fan without specially made KV motors for instance a 2250kv but for 4.5lbs of thrust (which will push a good 90mm foamie) it's good for that on 4, 5 and 6 cell motors.
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Old Dec 14, 2011, 09:59 AM
Xtreme Power Systems
Lake Havasu, AZ
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I think some are confusing efficiency of a fan (rotor) with efficiency of a fan system (fan/motor). If the motor is too small or Kv incorrect for the load, the efficiency of the fan (rotor) can look to be poor. So, your graph curves only represent the results with the given motor, not the efficiency of the fan (rotor) itself. To compare fan efficiencies, you would need to spin the rotors at the exact same RPMs and compare load vs. RPMs vs. thrust.
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Old Dec 14, 2011, 12:23 PM
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so how is it that mark at extremerc can run this fan on 2720kv on 6s and be fine and say its as good as a minifan and our 2700kv motor on 5s cooked, there is so much contradicting info around this fan its unbelievable

isn't this fun
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Old Dec 14, 2011, 01:11 PM
EDF rules... :)
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Quote:
Originally Posted by jcdfrd View Post
so how is it that mark at extremerc can run this fan on 2720kv on 6s and be fine and say its as good as a minifan and our 2700kv motor on 5s cooked, there is so much contradicting info around this fan its unbelievable

isn't this fun
Can you point out the post where Extreme stated the motor kv he was using?

Eric B.
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Old Dec 14, 2011, 01:21 PM
3DHOG
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ya its in post #766, ah your right I misread his post he said on par with 2w-25 / minifan
my bad.....does anyone know what motor and kv he's using for 6s
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Old Dec 14, 2011, 01:35 PM
EDF rules... :)
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I dont know what he is running, I just did not remmember it mentioned in any post, thought I might have missed it.

Eric B.
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Old Dec 14, 2011, 01:39 PM
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Netherlands, Zwolle
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I would guess a made-to-order long can 1950kv HET.
The 3W25 should work well with a 6s pack, if you look back some 5 pages (stevekott) there are some results with this motor and the stock Habu 32.
@Eric, Marc kept this his secret... :-)
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Last edited by hommel; Dec 14, 2011 at 05:58 PM.
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Old Dec 14, 2011, 01:48 PM
EDF rules... :)
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Hi Hommel,

He is a shrewd devil eh!!!


Eric B.
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Old Dec 14, 2011, 02:21 PM
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Originally Posted by jcdfrd View Post
ya its in post #766, ah your right I misread his post he said on par with 2w-25 / minifan
my bad.....does anyone know what motor and kv he's using for 6s
I did similar numbers on 2150kv

Also, what sized can did you used on the 2700kv?

Thx
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Old Dec 14, 2011, 03:11 PM
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it was the ammo 28-45, not long enough. we are going to try a couple of cyclone power outrunners next, going for additional power handling, cooling and torq. just waiting on them to arrive
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Old Dec 14, 2011, 05:55 PM
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Originally Posted by AirX View Post
Hi Hommel,

He is a shrewd devil eh!!!


Eric B.
Well, he's no dummy, that's for sure :-)
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Old Dec 15, 2011, 04:48 AM
Guarantee at least one landing
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Australia, QLD, Mooloolaba
Joined Aug 2007
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Quote:
Originally Posted by bamaguy View Post
I have the same concern.....This alloy Lander shroud will solve the heat problem

http://www.pw-rc.com/product_info.ph...oducts_id/2135
Does anybody know what's happened to this shroud. When I first went on the site it was there, went back and now the Product is not found?
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Old Dec 15, 2011, 08:10 AM
Aka: Tom Jenkins
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http://www.hobbypartz.com/alaleldufan6.html
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Old Dec 15, 2011, 09:28 AM
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Fairborn, OH
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Those RC Lander shrouds are real heavy.
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