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Old Jun 11, 2012, 12:59 PM
Lee Liddle
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Carrollton, Tx
Joined Dec 2006
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Very very cool! Good job of breaking down the lack of power.

This may be one of those planes that you get up to speed, then retract the gear to become airborne. JK
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Last edited by Knife Liddle; Jun 11, 2012 at 01:10 PM.
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Old Jun 11, 2012, 01:05 PM
Lee Liddle
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Carrollton, Tx
Joined Dec 2006
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Quote:
Originally Posted by falcon5 View Post
one fan to compliment the other while degrading itself.
Sounds a lot like my X marriage
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Old Jun 11, 2012, 01:10 PM
Now in TN!
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Chapel Hill, TN USA
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Cool !!!!!!!!!!!!!!

J
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Old Jun 11, 2012, 01:17 PM
Capt. Z
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Tonopah, Nevada
Joined Dec 2004
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Quote:
Originally Posted by Knife Liddle View Post
Sounds a lot like my X marriage
And the divider I put between the fans will be like their divorce.. I told them that's it..I have had it up the here...if you two fans can't get along I am building a wall between you
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Old Jun 11, 2012, 01:31 PM
DELTAS RULE
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tehachapi, CA
Joined Jan 2006
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man, that is really interesting. its like one fan is stealing the air from the other. i knew i could hear serious turbulance in the fans from the first video.

so i guess no more maiden attemps until this next weekend? i would make a v shaped wall that runs all the way to the inlets, there by completely sealing them from each other.

i should have 4500W per side on mine im hoping. man, after all this stuff, i might just have to make some ducts for mine. we'll see how yours does first though mister lab rat lol
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Old Jun 11, 2012, 01:37 PM
Another one on the way...
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Plano, Texas
Joined Feb 2009
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Originally Posted by falcon5 View Post
And the divider I put between the fans will be like their divorce.. I told them that's it..I have had it up the here...if you two fans can't get along I am building a wall between you
Wow! Exactly what my dad did to me and my sister when we were ~10 years old...
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Old Jun 11, 2012, 01:40 PM
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Fairborn, OH
Joined Nov 2009
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Congrats. Still a good day. You got some more useful data and a way forward. As they say, the best place to find the problems is while you are still on the ground. :-) It's looking good on the video.
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Old Jun 11, 2012, 01:40 PM
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Wow! Exactly what my dad did to me and my sister when we were ~10 years old...
Because of the turbulence between you two?
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Old Jun 11, 2012, 01:41 PM
Another one on the way...
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Plano, Texas
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Originally Posted by falcon5 View Post
Pass 3 and 4 if you look close I am able to lift the nose off the ground with about 3/4 elevator. These passes are with fan 2 running 1000Watts short so once corrected and with a grand of watts more i think she will fly
You know something? You are not going to regret holding off and getting this resolved. Besides, all those high-speed runs will be so much helpful in actually taking off. You will feel comfortable with the take off all the way to the roll, and then, when you feel comfortable, just add a little more throttle and a little (just a little) more elevator, and your maiden will begin, with you feeling more confident. You spent a lot of time building it. Don't lose it to impatience... Ask Lee--I've been working on my Yellow F-18 for two years now, and I am not planning on flying it for at least one more year, until I feel confident enough.
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Old Jun 11, 2012, 01:55 PM
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Fairborn, OH
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Regarding the unequal power, there are probably some smart guys out there on this one, but I was just thinking. The numbers are pretty much the same when running solo, so it is unlikely that this disparity is caused by your electronics or your inlets/outlets (although out of an abundance of caution I'd be checking those as well). But if both fans are turning the same direction, you are probably getting some funky unequal vortex pressures on one side between the fans and the intake walls. It would seem the best way to equalize all of that would be to consider Corsair Nut's way forward and have a divider all the way to the front. Just a thought. But you are treading new ground and we are all enjoying the ride. :-)
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Old Jun 11, 2012, 02:04 PM
Fly it like you STOL it!
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Quote:
Originally Posted by alexandermh View Post
Regarding the unequal power, there are probably some smart guys out there on this one, but I was just thinking. The numbers are pretty much the same when running solo, so it is unlikely that this disparity is caused by your electronics or your inlets/outlets (although out of an abundance of caution I'd be checking those as well). But if both fans are turning the same direction, you are probably getting some funky unequal vortex pressures on one side between the fans and the intake walls. It would seem the best way to equalize all of that would be to consider Corsair Nut's way forward and have a divider all the way to the front. Just a thought. But you are treading new ground and we are all enjoying the ride. :-)

Darn, beat me to it. I was typing up a post about that >

Anyway he's probably right, because they're spinning the same direction....

Adding the wall to 'divorce' them will probably fix it.
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Old Jun 11, 2012, 02:07 PM
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Madison, MS
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I think it has been previously said and I'm no expert but I would definitely separate the fans completely. Looking great, keep up the good work.
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Old Jun 11, 2012, 02:18 PM
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Austin, Texas
Joined Dec 2005
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Falcon

Can you supply some close up shots of the inlets, especially at the fan interface. You do have a good radius on any edges, correct? The larger the radius the better, but I would suggest no smaller than 1/2 radius for these fans. The lip where the fan meets the inlet needs to be smooth as possible, any little edge will set-up vortices that reduce fan efficiency.

For this bird you can not afford to cut any corners. You are doing good, keep pushing forward.

Peace, Wolf
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Old Jun 11, 2012, 02:23 PM
Capt. Z
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Tonopah, Nevada
Joined Dec 2004
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AAHaaaa dang what would I do without you guys...never thought of that ...both fans turning the same direction and creating a wierd vortex.. you guys are good. I filed for fan divorce an hour ago...divorce should be finnal tonight or tomorrow. with both fans sucking their own independent wind .
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Old Jun 11, 2012, 02:29 PM
Capt. Z
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Tonopah, Nevada
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Quote:
Originally Posted by bd5wingnut View Post
Falcon

Can you supply some close up shots of the inlets, especially at the fan interface. You do have a good radius on any edges, correct?
Well here is what the fans sit in. Stu Maxwell did say that he would like to see my inlets a little less sharp were the air first enters the fuselage.
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