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KW club

Old 03-23-2010, 05:21 PM
  #176  
groundrushesup
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Originally Posted by firemanbill View Post
Is that the new smaller Shoestring? Mine is the old glow model that I converted to electric.

[media]http://www.youtube.com/watch?v=FtuukImCdL0[/media]
Yessir, it is the smaller re-issue.
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Old 03-23-2010, 05:37 PM
  #177  
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hmmm... I don't have any way to take a log of it, but my trex500 has the scorpion 3026-1600kv motor on 16t pinion, that is supposed to be around 1400 watts...

I have the align 100amp esc and a new turnigy 6cell 20c 2650 battery on it... I'm sure it's doing at least 1000watts...

As A well known common setup.... is that acceptable?

Here's a video of me flying it...
http://www.vimeo.com/7859814

SK

Last edited by ministeve2003; 03-23-2010 at 07:17 PM.
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Old 03-23-2010, 05:59 PM
  #178  
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Originally Posted by groundrushesup View Post
Yessir, it is the smaller re-issue.
Cool, looking forward to seeing one of those in action.
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Old 03-24-2010, 11:39 AM
  #179  
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I have seen as high as 66A on a full pack running 20.78VDC, but that was before replacing my Phoenix 85 for the Phoenix 60 ESC.
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Old 03-25-2010, 03:20 AM
  #180  
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Is there a half Kw club??? Managed to break that little milestone last night.....
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Old 03-25-2010, 07:31 AM
  #181  
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Originally Posted by ministeve2003 View Post
hmmm... I don't have any way to take a log of it, but my trex500 has the scorpion 3026-1600kv motor on 16t pinion, that is supposed to be around 1400 watts...

I have the align 100amp esc and a new turnigy 6cell 20c 2650 battery on it... I'm sure it's doing at least 1000watts...

As A well known common setup.... is that acceptable?

Here's a video of me flying it...
[media]http://www.vimeo.com/7859814[/media]

SK
I saw one guy a while back had his watt meter strapped to the skids and was videoing with a zoom while he did a hover. You might be able to catch the peak on a hard punch out if the timing was right with the camera. Maybe someone with a fast shutter on a still camera could catch it just right.

Ive also seen a guy strap his heli down (a wood 1x4 through the skids screwed to a picnic table) and do full power, full collective run ups with a watt meter attached but just the thought of doing that scares the heck out of me!

Or... you could pick up an ICE controller. Who knows, you might even decide to give GOV mode a try
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Old 03-25-2010, 06:44 PM
  #182  
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Originally Posted by Larry3215 View Post
I saw one guy a while back had his watt meter strapped to the skids and was videoing with a zoom while he did a hover. You might be able to catch the peak on a hard punch out if the timing was right with the camera. Maybe someone with a fast shutter on a still camera could catch it just right.

Ive also seen a guy strap his heli down (a wood 1x4 through the skids screwed to a picnic table) and do full power, full collective run ups with a watt meter attached but just the thought of doing that scares the heck out of me!

Or... you could pick up an ICE controller. Who knows, you might even decide to give GOV mode a try
LOL, I don't scare very easy... I've held the trex500 above my head and had a buddy throttle it up and give it full collective... that thing actually feels pretty darn strong.... I'll just stick a wattmeter on it, the wattmeter records the highest draw while it's on, so after shutting it down I should be able to take a pic...

SK
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Old 03-29-2010, 03:31 AM
  #183  
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Originally Posted by firemanbill View Post
Cool, looking forward to seeing one of those in action.
Well here's some pics of the wattmeter after the run-up as promised - had to search high and low for a Tru-Turn center-screw spinner adapter that would mount to a 6MM shaft via a collet but I finally got one from MyAtomic and they shipped it out 2x-time - I have some video that makes the Watts number a bit clearer, but it is HD so it is taking me a few minutes to process.

Here's the Vid. hoping as it is processed the #'s will be come clearer... else I can get a screenshot from the original HD video.

[MEDIA]http://www.youtube.com/watch?v=KLKs6Adb3QM[/MEDIA]

KW Badge? Yes Please!
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Last edited by groundrushesup; 03-29-2010 at 04:14 AM.
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Old 03-29-2010, 06:02 AM
  #184  
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Well, I'm supposed to be getting 1300 watts with this setup, but it maxed out at 1037... I didn't think the altitude would have that much effect. Probably go from the 15x7 to maybe a 15x8 or a 16x7 if I can find it. Still, this is a very nice plane - very crisp and plenty of power for 3D. No fancy stuff in the video, it was the first flight.

http://www.youtube.com/watch?v=bLP5B8XfMD0
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Old 03-29-2010, 06:05 AM
  #185  
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Hmmm... something went wrong with that post?
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Old 03-29-2010, 11:14 AM
  #186  
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Ok Ground, please list the details so I can get your award taken care of.
I copy-paste what you post about; plane, motor, speed control, prop size, battery pack, peak KW.


Originally Posted by groundrushesup View Post
Well here's some pics of the wattmeter after the run-up as promised - had to search high and low for a Tru-Turn center-screw spinner adapter that would mount to a 6MM shaft via a collet but I finally got one from MyAtomic and they shipped it out 2x-time - I have some video that makes the Watts number a bit clearer, but it is HD so it is taking me a few minutes to process.

Here's the Vid. hoping as it is processed the #'s will be come clearer... else I can get a screenshot from the original HD video.

[MEDIA][media]http://www.youtube.com/watch?v=KLKs6Adb3QM[/media][/MEDIA]

KW Badge? Yes Please!
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Old 03-29-2010, 05:21 PM
  #187  
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Originally Posted by Don Sims View Post
Ok Ground, please list the details so I can get your award taken care of.
I copy-paste what you post about; plane, motor, speed control, prop size, battery pack, peak KW.

Great Planes Shoestring
Scorpion 4020-10 @ 630Kv
Turnigy Plush 60A ESC
APC 12x6 e-prop
Rhino 3700mAh 3S2P configuration (making a nominal 22.2v)

Peak Amps: 60.70
Peak Watts: 1358.4


Thanks!
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Old 04-07-2010, 10:43 PM
  #188  
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Got the Yak 54 up higher than I thought. I changed from a 21X8 thin wood to a 20 X 10 APC and It went up to 3048 watts ! That's 4 HP.



Nitroplanes Yak 54 Black-Friday edition.
3048 Watts
72" wingspan
13.75 lbs.
Hobbywing 100A HV Opto ESC
Exceed 160 on 10S 4900 Zippy Rhinos
APC electric 20 X 10. Too much prop I just found out !
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Old 04-16-2010, 11:21 PM
  #189  
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NAME: sbchero
SPEED: 133 MPH
Watts: 1145
PLANE: Parkzone p51 BL
MOTOR: Scorpion HK-3026-1400KV
ESC: Turnigy 80Amp
BATTERY; 4s 2650mah 40C Flight Max Lipo
PROP: APC 8x8


[media]http://www.southbaycustoms.com/other/RC/plane/133mph%20p51.jpg[/media]
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Old 04-17-2010, 01:58 AM
  #190  
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Congrats you two! Got you both taken care of. Aramsdell, not many folks around here have the 3kw award!
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Old 04-17-2010, 02:53 AM
  #191  
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Thanks Don,

That power system is strong. I am going to prop back though, from 20x10 APCe to maybe 21x8 APCe. I had a 21x8 thin wooden electric from China but the tips flexed horribly in flight and made more noise than thrust.

Current takeoff mode is 1/2 throttle and take off like a sport ship that's at 100% OR use full throttle and pull vertical in about 45 feet.


4 HP rocks.

Alan Ramsdell
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Old 04-18-2010, 01:14 AM
  #192  
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well i couldnt leave well enough alone. i wanted that 2kw award.



2097.2 watts. maybe ill try for 3kw soon enough.

NAME: sbchero
SPEED: 154 MPH
Watts: 2097
PLANE: Parkzone p51 BL
MOTOR: Scorpion HK-3026-1400KV
ESC: Turnigy 80Amp
BATTERY; 5s 2650mah 40C Flight Max Lipo
PROP: APC 8x8
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Old 04-18-2010, 01:16 AM
  #193  
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damn, pic is too small.

heres the full size

[media]http://www.southbaycustoms.com/other/RC/plane/5s8x82097watts.jpg[/media]
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Old 04-18-2010, 04:05 AM
  #194  
aramsdell
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sbchero, That pic doesn't come up full size on my screen. BUT I did manage to open it full screen by right clicking and opening the link that way. your 6 second log by Eagle Tree looks good for what you said.

Al
P. S. What does a P-51 look like doing a scale 1707 mph? (rough calc on the length of each) Isn't that about mach 2.5???

I have a GP Combat Spitfire. Had it at the NEAT Fair last fall. 4S 4900 and Hacker A30-12xl and it was FAST. Your is scaring me. Ha. Now it flies on a 3S 2100.
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Old 04-18-2010, 05:58 AM
  #195  
Larry3215
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sbchero, here is some interesting math for you.

Your plane needed 1145 watts to go 133 mph.

In theory, when you increase speed, the power required goes up by the cube of the change in speed - all other things remaining the same.

So, your new speed is 154mph. Thats a speed increase of 154/133 = 1.16 times as fast.

That means that you would, in theory, have needed 1.16 x 1.16 x 1.16 = 1.56 times as many watts to go that much faster or 1.56 x 1145 = 1787 watts.

You actually needed 2097 watts or an extra 310 watts = about 17% or so more than the theory predicts.

Some of that extra power you used went into over coming the extra drag at the higher speed, but most of that extra 17% or 310 watts, is probably going into the form of heat in your motor.

Thats an EXTRA 310 watts over and above what ever the motor was wasting as heat before at the lower power level.

At 1145 watts your motor was probably somewhere in the 70-75% efficient range, so it was probably converting about 280 to 340 watts into heat already at the lower speed.

At this new power level, your probably heating that motor with somewhere around 600 watts.

Thats a 7 ounce motor thats converting roughly 600 watts of power into heat!!!

I have a heavy duty soldering iron that weighs about that much that gets hot enough to melt solder with only 50 watts of power. Your poor motor is having to deal with more than 10 times as much heat energy

Be nice to it. Its working very hard for you
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Old 04-18-2010, 06:16 AM
  #196  
sbchero
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very interesting larry.
that is one reason i only do a speed run for about 4-6 seconds.
but to get this plane @ those speeds, (previous record was 132) you need to push the motors past thier limits. i was fully prepared to fry a motor, id chock it up to the cost of trying to beat the record.
thats also why i got a scorpion motor, they are rated to something like 350*. when i landed the motor was no hotter than about 140* (i realize that in the air at full throttle temps were much higher)

very good info though. thanks
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Old 04-18-2010, 06:30 AM
  #197  
Larry3215
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Yeah, pushing the limits is necessary to "get there" most of the time. Im sure most all of us are guilty of that

You might make it a practice to do a nice loooooong power off glide after each full power run to give that puppy time to cool.

Great job on the speed runs by the way
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Old 04-27-2010, 06:44 PM
  #198  
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Here is my latest venture over 2kw.
A 20x10 should push 3kw,.....at 260watt/lb now who needs it.


Name: hxgplanes
Speed: ???
Watts: 2672
Plane: Seagull Edge 540 68"
Motor: Hyperion Zs4045-12 247kv
ESC: Castle Creations Ice HV 80
Battery: (2)5s for 10s 3600mah 30c
Prop: APCe 18x10
Weight 10lb 2 oz
(3) 5 min flights per batt.





http://www.youtube.com/watch?v=D30LVxPtCus

Last edited by hxgplanes; 04-27-2010 at 07:11 PM.
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Old 05-19-2010, 03:01 AM
  #199  
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Also getting over 2200 watts on (12) A123 cells
10s 3600 Lipo and 12s A123 packs weigh exactly the same.
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Old 05-20-2010, 06:28 PM
  #200  
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Here's my Sig Something Extra that I hopped up a tad just for the heck of it but I do like the Extra power for sure. I do plan on trying some different props to drop the amps somewhat.
Sorry for the not so great photos but my new camera & my old computer

Standing By,
SJ

AUW - 6 lbs. 4 ozs.
Motor - Turnigy C4260-500kv
Prop - Turnigy 15 X 8 wood
Battery - 22.2V 6s1p 20~30C 4000mAh Turnigy lipo
Watts - 1158.2
Amps - 50.49
Volts - 22.94
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