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MPJet AC 22/7-45 for tiny wing

Old 12-04-2008, 11:22 PM
  #1  
jobu
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Default MPJet AC 22/7-45 for tiny wing

I have one of these MPJet AC 22/7-45 from HL but they no longer carry it.
Does anyone have any numbers for this motor so I can get a good battery and prop setup and run through motocalc.
I wanted to see if 5x5 would work with 2s or 3s
Thanks
Joe

I wanted to put it in this

http://www.bmkdesigns.net/Stingray-b...RC-pr-210.html
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Old 12-05-2008, 05:17 PM
  #2  
Dr Kiwi
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http://www.mpjet.com/catalogue/p16.pdf

Using their data I added the motor to Motocalc.

Although the Manual only mentions 2s, I can't see why 3s should not be okay with a small prop, keeping the amp draw well within the 8-10A limit. The recommended max rpm is 15000, so you are still under that too. [2s simply won't cut it with a prop this small].

Motor: MPJet 22/7-45D; 1400rpm/V; 0.55A no-load; 0.2 Ohms.
Battery: Thunder Power TP480; 3 cells; 480mAh @ 3.7V; 0.012 Ohms/cell.
Speed Control: Castle Creations Phoenix 10; 0.0013 Ohms; High rate.
Drive System: Direct Drive; 5x5 (Pconst=1.47; Tconst=1) direct drive.
Airframe: Anything you want.
Motor Amps = 5.1
Motor Volts = 10.9
Input (W) = 56.0
Prop RPM = 13834
Thrust (oz) = 7.5
PSpd (mph) = 65.5

That 5x5 is a lousy prop - I'd rather you used a Zagi Carbon:

Motor: MPJet 22/7-45D; 1400rpm/V; 0.55A no-load; 0.2 Ohms.
Battery: Thunder Power TP480; 3 cells; 480mAh @ 3.7V; 0.012 Ohms/cell.
Speed Control: Castle Creations Phoenix 10; 0.0013 Ohms; High rate.
Drive System: Direct Drive; 5.1x4.9 (Pconst=1.54; Tconst=1.163) direct drive.
Airframe: Anything you want.
Motor Amps = 5.5
Motor Volts = 10.9
Input (W) = 60.4
Prop RPM = 13698
Thrust (oz) = 9.7
PSpd (mph) = 63.6
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Old 12-06-2008, 12:06 AM
  #3  
jobu
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Boy I wish my regular doctor would give me that much information...Thanks Doc!
My main concern is that the plane is so small (prop cut out is for a 3-4") ...Stretching to a 6" would greatly reduce structural ridgidity. I could add some cf but want light and simple. Also I wanted to make a two planes and keep them similer for racing my friends.

But I can improvise...I also have a Hacker A-10 15s and a couple (3) Emax CF2805 from some HyperFleas from SuperFly. I have either 2s 800 PolyQ or 3s 1000 TP to work with. The 2s are alot lighter and more plentiful. I will keep the MPJet in the foamy for now.
What do you think on the Emax on 2s?
And thanks again!
Joe
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Old 12-06-2008, 05:46 AM
  #4  
Dr Kiwi
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At 2840Kv that Emax should be good on 2s - can you fit a 5.1" prop in there (that would be ideal, maybe drawing 7-8A), or do you have to go down to 4" or so (limited amp draw and power, but maybe enough).
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Old 12-06-2008, 11:06 PM
  #5  
jobu
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Doc, Thanks again. I put the Emax on with a generic 5x4.3 prop and it seemed ok...might go down in pitch...didn't have the punch. I think my thrust angle was off a bit. It seemed to be snow plowing needing alot of up elevator...could be the cog but mfg's spec arent too specific. Its a midship pusher and it has about 2+ degrees upward angle...I will try it more nuetral maybe?
Thanks for the help...I will also give the Hacker a10 a whirl too.
Joe
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Old 06-17-2011, 01:31 AM
  #6  
kvflyer
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just burned that same motor out and was prolly pushing it too hard FT going up windaltho the 12A esc managed to survive

last static reading was on a 8x6 3S 450 130W 13A------8x6 2S 800 57W 8.50A
am surprised the numbers didnt drop when it unloaded

Last edited by kvflyer; 06-17-2011 at 03:58 AM.
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