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Old May 28, 2009, 02:12 PM
EDF Jet Jam May 2014
Robert Belluomini's Avatar
United States, KY, Crestview Hills
Joined Dec 2000
6,579 Posts
Hi Fred,
I was referring to when WW used the pletti motor in this model.

"The first flight was with a Pleti on 10s and we were registering 5.8 Lbs of thrust, the upgrade to a lenher 2250/16 got that up to 8lbs at 2,800 watts (100mm outlet, did not know better at the time), did not actually improve the performance that much.

How things have move on eh?"


Your Dyn-E-Max worked great for Kevin.
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Old May 28, 2009, 03:27 PM
Suspended Account
Braintree, Essex
Joined Mar 2006
3,174 Posts
Quote:
Originally Posted by bladexz2
Wasn't that current EDF/motor combination a Dyn-E-Max Fan /scorpion motor?

Mack 1, have fun!

Fred / Dyn-E-Max.com / 317-293-6449
Fred, You are about as subtle as falling masonary LOL!

Look forward to seeing mine arrive in due course

Steve
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Old May 28, 2009, 05:08 PM
smug in granny panties
monkamarm2000's Avatar
NorCal Silicon Valley
Joined Aug 2002
11,779 Posts
and why surprise Stu? if it flew on old 120mm 2.5 kw then why wouldnt it fly on 90mm with same watts and thrust but higher efflux of modern sytems. 9 pound sis 9 pounds but higher efflux is always higher efflux. And with a smaller fan pulling less amps then why wouldnt it make more sense in a draggy plane where lotts watts for top end would get lost anyway, so smaller fan less load less mah higher efflux to maintain decent flight speed in draggy model.
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Old May 28, 2009, 05:40 PM
The blade numbers go up to 11
stumax's Avatar
Sydney, Australia
Joined Aug 2002
4,385 Posts
Barry, I'm surprised because I heard lots of stories about it being a very bad flier. There was never going to be a problem giving it enough power, but having a model which flies nicely is a different story. If you go 90mm you won't have the same thrust down low, and will need to reach a much higher airspeed for the dynamic thrust to be the same as for a 120mm fan with the same power. That's the issue, as I think it will be speed limited by the draggy airframe. It will probably work fine, though, and if you wanted to make a meal of it you could close off the inlets and go scale and it would work much better. BTW, the fuselage looks a little "tubby" in the pics, is it "tubby" or is it close to scale?

Stu.
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Old May 28, 2009, 08:27 PM
smug in granny panties
monkamarm2000's Avatar
NorCal Silicon Valley
Joined Aug 2002
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Yeah gotcha! know exactly what you mean now. There not the greatest flying for sure, that and there just cheap for me it didnt make sense to throw lotta money in fan into it. And down low is kinda subjective at this power level range (i.e 2-3kw range well within the realm of both fans) big fan makes low thrust at 70 of its 100 lets say and the smaller fan makes same thrust but at maybe 65 or 70 of its 90 in that power range, same watts same thrust, the bigger fan could just make more if ya added more power, otherwise 7 pounds is 7 pounds one just pulls different amps. Yeah the fan is spinning faster to get there but it spins faster all around the band by nature.
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Old May 28, 2009, 08:35 PM
smug in granny panties
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NorCal Silicon Valley
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oh! and totally agree again on inlets, they would help alot if they were smaller, but again just couldn't bring myself to dig deep into this one. Plus I have a turbax that'll need a home later and it would make a ideal test bed for it.

Barry
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Old May 29, 2009, 01:20 PM
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Herb's Avatar
Irvine, Calif USA
Joined Feb 1999
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Quote:
Originally Posted by stumax
... I heard lots of stories about it being a very bad flier. ...Stu.
It would not have been the first one to get labeled as a "very bad flyer" on RCG - because people just can't set them set up right, and end up with an overweight pig

But this Hawk looks nice esp. for the price. Unfortunately it is a bit tubby, the proportions just aren't quite right. Also, I think 90mm is not going to do it on this one.
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Old May 29, 2009, 01:36 PM
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ohio
Joined Aug 1999
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This plane is a bit "tubby". it looks a bit better in person but you can obviously see where they cheated in the pics.

It flies good, even at 13lbs 12oz. ... much better than I had expected after going through some of the threads here and on rcu. The flap throw recommended in the manual is a joke, it needs much more.
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Old Jun 06, 2009, 11:16 PM
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just charged up the packs to get ready for some flying tomorrow.

The last flight was about 5 1/2 minutes from takeoff roll to touchdown. Capacity put back into the batts just now was 4127mah.

the resistance of the xps 5000 packs (according to my duo) is 51 mohm. anyone else checked theirs?
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Old Jun 07, 2009, 01:17 AM
smug in granny panties
monkamarm2000's Avatar
NorCal Silicon Valley
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I checked a bunch the other day and it was 10. Maybe got a bad connector? I've seen times here and there where funny solder or bad deans gave false reading.

Barry
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Old Jun 07, 2009, 01:17 PM
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Irvine, Calif USA
Joined Feb 1999
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Quote:
Originally Posted by kevin
... the resistance of the xps 5000 packs (according to my duo) is 51 mohm. anyone else checked theirs?
Normal. My 6-mo old evos are up to 95-100 mO (same charger as yours); new TP's are much lower. Check them again in 5-10 flights...
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Old Jun 07, 2009, 03:11 PM
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ohio
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No flight on the hawk today. The cc110 went poof on the taxi out....
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Old Jun 07, 2009, 03:23 PM
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Tampa FL
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WOW it poofed all right! I wounder why that happend? Are you going to try the 140 now?
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Old Jun 07, 2009, 07:20 PM
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i am going to send this one back for repair/replacement.
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Old Jun 07, 2009, 07:50 PM
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Tampa FL
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If you do need to get one the market I think is getting flooded with them since the new 140s came out. I sent my system for update at BVM and they are flooded with old 110s now. I bet they are getting real cheap now.
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