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What's a good, inexpensive motor for a GWS Warbird?

Old 12-21-2008, 02:05 PM
  #26  
Grasshopper
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Originally Posted by Bill G View Post
That's exactly the sound they make, "whirl".
That's the one thing I missed when I changed my E-Flite P-47 from the stock brushed geared set up to the Park 450. The first thing I noticed was that it went quiet. Although the performance was a little better. I did prefer the "whirl" sound over the quiet.
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Old 12-21-2008, 03:55 PM
  #27  
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...or is the "whirl" sound the quiet?

I figured the gearbox sound would be something more like the sound of rocks in a blender...
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Old 12-29-2008, 07:52 PM
  #28  
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Default 60.23

Originally Posted by Lieutenant Loughead View Post
Thanks for this! The link gives me all the details I need, including prop to use, amp draw, and measured RPM (from which, I can calculate prop pitch speed).

It looks like I'll be hitting 53 mph with an 8x8 prop, and drawing only 17 amps... That looks like a winner to me... On the other hand, the motor will be sticking out the front of the Spitfire's cowl... :o

I'll probably go ahead and order this one -- but are there any other ideas?
Okay -- I just took the motor off the thrust bench. Here's what I got:
  • Turnigy 2217 Brushless Motor
  • 1050 Kv
  • APC 8x8E Propeller
  • Loong Max 3s 2200 mAh 20C LiPo #4 (battery used in test)
  • 13.82 Amps (peak)
  • 11.44 Volts (minumum, under load)
  • 162.2 Watts (peak)
  • 394 grams of thrust (13.9 ounces of thrust)
  • 7950 RPM
  • 91.00 MPH (calculated by Minimum Volts * Kv * Pitch)
  • 60.23 MPH (calculated by RPM * Pitch)
So, I'm getting roughly the same speed, with 5 FEWER ounces of thrust, and 2 FEWER amps drawn.

...and the motor is heavier... So, this motor probably isn't the answer I was looking for -- However, I'm going to fly it this afternoon, and I'll report back to you then.
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Old 12-29-2008, 11:04 PM
  #29  
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Okay -- here's the flight report:

I took the BP-21 brushless motor out of the GWS Spitfire, and installed the Turnigy 2217 16turn 1050kv 23A Outrunner. In doing so, I was able to remove the one-ounce lead weight I had installed, to get the GWS Spitfire to balance with the lightweight BP-21 brushless motor -- as it turned out, the airplane balanced perfectly without that lead weight!

Just before launch, I powered up to WOT, and said, "Boy, this sure doesn't seem to have very much thrust." On launch, the airplane left my hand with ease, and took to the skies with no issues.

Most of the 11-minute flight, I flew around at half throttle. I did perform all kinds of tricks (loops, rolls, immelman turn, split-S turns, hammerhead stalls, inverted flight, etcetera). The only thing the airplane would NOT do, is accelerate straight up -- it just doesn't quite have the thurst to do it.

In any event, I'm happy with this motor -- she seems to have plenty of SPEED.
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Old 12-29-2008, 11:08 PM
  #30  
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Guy,

What prop did you use? Would you be able to improve vertical with a different prop?
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Old 12-29-2008, 11:18 PM
  #31  
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Hey Kev. I was actually thinking the same thing. I used the suggested APC 8x8E prop. An APC 9x7.5E prop would probably do the trick, but would result in a slightly slower top speed.

Thanks for asking!
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Old 12-29-2008, 11:31 PM
  #32  
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Originally Posted by Lieutenant Loughead View Post
Hey Kev. I was actually thinking the same thing. I used the suggested APC 8x8E prop. An APC 9x7.5E prop would probably do the trick, but would result in a slightly slower top speed.

Thanks for asking!
I figured it would give lower top-end speed, but if you say she has plenty of speed now, perhaps it would be worth the trade-off. And you're welcome. (Click my THANKS button! )
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Old 12-29-2008, 11:57 PM
  #33  
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Originally Posted by gfdengine204 View Post
I figured it would give lower top-end speed, but if you say she has plenty of speed now, perhaps it would be worth the trade-off. And you're welcome. (Click my THANKS button! )
Kev::The last time I pushed a Mod's buttons, I got Heck!I was think'in 9/7 but the 9/7.5 will dig real air good, bub, steve
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Old 12-30-2008, 12:36 AM
  #34  
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Default Bp 2217-4h

$ 17.00......3500 KV ..2 LIFEPO4's = 7 v @ 23 a.......23 oz. thrust & 59 mph in flight speed on a GWS HD 7 x 3.5". It has a power whine @ 16,000 rpm. Weight is 2.5 oz...28 mm dia.
Too many WOT amps ? Less throttle stick. The H means Heli with a 3 mm shaft
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Old 12-30-2008, 01:05 AM
  #35  
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Listening in.
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Old 12-30-2008, 02:09 AM
  #36  
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something to note... that 2217 1050kv motor, you can push to 20amps without any issues... I normally use it with a 10x4.7sf prop at 220-230watts... so I would try the bigger prop... (who can really see the difference between 55 and 60 anyways...LOL)

also, I'm using that motor on my stryker with a 4cell 1000mah pack, pulling about 15amps 220 watts... on a 7x7 graupner prop.... and it comes down cool, unfortuanately I would like to push it a little more, but the strykers fins get in the way for that...

SK

Last edited by ministeve2003; 12-30-2008 at 03:26 AM.
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Old 12-30-2008, 02:46 AM
  #37  
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Originally Posted by ministeve2003 View Post
also, I'm using that motor on my stryker with a 4cell 1000mah pack, pulling about 15amps 220 watts... on a 7x7 groupner prop.... and it comes down cool, unfortuanately I would like to push it a little more, but the strykers fins get in the way for that...
Now, THAT's interesting... How fast does your Stryker go, with that power system?
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Old 12-30-2008, 03:12 AM
  #38  
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Originally Posted by Lieutenant Loughead View Post
Now, THAT's interesting... How fast does your Stryker go, with that power system?
it does about 70mph with the graupner, and with a 7x5apc prop its about the same amp/watts, but gets alot more thrust but maybe 60-65mph....

Downside with the apc prop is the noise.... with the groupner, you bairly hear the prop, its the quietest plane I have, but with the apc one, it gets that striker noise back....

AUW is 20oz with that setup... I used some heavy 20gram digital metal gear servos (cause I had them) which could have lightened it up a little more...

I'd really like to try an 8x4 on 4cell to (hopefully) get around 16amps... or maybe 240watts... (I wouldn't try that static for too long)

ps, friday I did a perfect inverted fin touch on that stryker... then I had to watch about 3 people try to copy it with their t28's.... their results weren't so good.... LOL

SK


Last edited by ministeve2003; 12-30-2008 at 03:44 AM.
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Old 12-30-2008, 03:56 AM
  #39  
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Hehehe.....you aren't mentioning that every plane you ever fly gets the "can I drag the stab"? treatment have ya Steve??.......my new twin was shaking the other day from the thought and oh man that poor Super Cub!! lol

Steve's Stryker is a great exercise in how to juggle things and come up with a better version of the same plane flown everywhere. It's a joy to fly a Stryker that hasn't got a brick for a battery in the nose. Never seen one land so slowly/easily.

--Ray
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Old 12-30-2008, 07:48 AM
  #40  
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Originally Posted by Wrench66 View Post
Hehehe.....you aren't mentioning that every plane you ever fly gets the "can I drag the stab"? treatment have ya Steve??.......my new twin was shaking the other day from the thought and oh man that poor Super Cub!! lol

Steve's Stryker is a great exercise in how to juggle things and come up with a better version of the same plane flown everywhere. It's a joy to fly a Stryker that hasn't got a brick for a battery in the nose. Never seen one land so slowly/easily.

--Ray
Hehehe... the funny one was when Rudy Said to Snaproll the stryker... the next words out of his mouth was...."how the heck... that doesn't have a rudder?"....lol

I love when you get to make planes do things they're not supposed to do....LOL

SK
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Old 12-30-2008, 01:26 PM
  #41  
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Default Fantastic.

How about my double cartwheel on a landing.

Rich
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Old 12-30-2008, 03:15 PM
  #42  
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Originally Posted by Cyclops View Post
How about my double cartwheel on a landing.

Rich
I did that with my GWS ME-109 once... After the "landing", I realized I landed with a tail wind, and caught a wind shear, which caused a tipstall...

The beauty of the deal was that I had spent the time, money, and energy to fully fiberglass the ME-109 -- so there was NO DAMAGE!
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Old 12-30-2008, 03:17 PM
  #43  
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Originally Posted by Lieutenant Loughead View Post
Okay -- here's the flight report:

I took the BP-21 brushless motor out of the GWS Spitfire, and installed the Turnigy 2217 16turn 1050kv 23A Outrunner. In doing so, I was able to remove the one-ounce lead weight I had installed, to get the GWS Spitfire to balance with the lightweight BP-21 brushless motor -- as it turned out, the airplane balanced perfectly without that lead weight!

Just before launch, I powered up to WOT, and said, "Boy, this sure doesn't seem to have very much thrust." On launch, the airplane left my hand with ease, and took to the skies with no issues.

Most of the 11-minute flight, I flew around at half throttle. I did perform all kinds of tricks (loops, rolls, immelman turn, split-S turns, hammerhead stalls, inverted flight, etcetera). The only thing the airplane would NOT do, is accelerate straight up -- it just doesn't quite have the thurst to do it.

In any event, I'm happy with this motor -- she seems to have plenty of SPEED.
I forgot to mention that everything (motor, ESC, and battery) came down cool, after the 11-minute flight.
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