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18x18 - 20x20 prop 10,000 rpm

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Old 06-16-2011, 11:32 AM
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Default 18x18 - 20x20 prop 10,000 rpm

hey guys i posted in the pylon area and only one response. i looking for a electric motor that will go in a Dominator 1500. the plane will be in the 15-20lbs range stock wing area is 1500 but i will cut new foam cores to around 1100-1300 range with a tapered wing and 8-10% thickness.

I am looking for a motor that can spin a 18x20 - 20x20 prop in the 9,500-10,000 rpm range.
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Old 06-16-2011, 12:10 PM
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Default RE: 18x18 - 20x20 prop 10,000 rpm

A Plettenberg 30-9 on 12S would put you in that range:


3.7 volts nominal x 12S = 44v

44v x 235 kv = 10340 RPM theoretical

subtract 10% for estimated actual and you have 9500 RPM more or less and then I would say based on a 20x13 using 90 amp I'd ballpark a 20x20 at 120 amps which puts you over 5000 watts output. I'd bet the Pletty can handle that for a burst, but that'd be a heck of a load if it was constant.


On the flip side a Neu F3A would do the same and you could tailor a gearbox to your exact specifications.


Both motors are available at [link=http://www.f3aunlimited.com/webstore/index.php?main_page=index&cPath=9&zenid=h4n8u6qvi9lcfu2up6edpgcn41]F3AUnlimited.com[/link]



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Old 06-16-2011, 04:05 PM
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Default RE: 18x18 - 20x20 prop 10,000 rpm

thanks i emailed NEU with no replys... : (

I think i would do some 60-90 xec bursts. I dont want to run a gear box specially at these power levels.

yes the 270-310 kv is what i am looking for. there is alot of 50-80cc size electric motors out there but most are under 200 kv which will not get me there. I think i would need around 13,000-14,000 free rpm to get me there.

i will use the Castle 160 hv with NACA ducts for the speed control.
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Old 06-17-2011, 02:49 AM
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Default RE: 18x18 - 20x20 prop 10,000 rpm

Hi,
These motors are not rated for 5Kw.
Plettenberg do have motors in that range. S Neu may have as well - I'm not sure.
Also I'm not at all sure that 5Kw will turn those props at that RPM level'

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Old 06-17-2011, 12:02 PM
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Default RE: 18x18 - 20x20 prop 10,000 rpm

Youre right 5k will not get me there i need 6.5-7K in power to get there. I have looked around and no one sells a speed controller over 12S. I could get to this rpm if i had a controller that would allow me to run a 15-18S pack.
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Old 06-17-2011, 02:32 PM
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Default RE: 18x18 - 20x20 prop 10,000 rpm

I have read these guys do an aircraft version, this is the boat one http://fightercatracing.com/index.ph...chk=1&Itemid=1

17s (72volts) 150 amps [X(]

I'd reckon you would want to be real careful playing with these sort of voltages though

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Old 06-17-2011, 09:12 PM
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Default RE: 18x18 - 20x20 prop 10,000 rpm


ORIGINAL: airraptor

Youre right 5k will not get me there i need 6.5-7K in power to get there. I have looked around and no one sells a speed controller over 12S. I could get to this rpm if i had a controller that would allow me to run a 15-18S pack.
Hi YGE 160HV can be ordred ti handle 15S or ask for the YGE 200HV whish is not on thier official site
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Old 06-20-2011, 03:34 AM
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Default RE: 18x18 - 20x20 prop 10,000 rpm

Hi YGE 160HV can be ordred ti handle 15S or ask for the YGE 200HV whish is not on thier official site
Joenella, you may remember what happened to my YGE160HV which I bought from your company for 15s. It lasted about 30 seconds.

On the other hand, there are plenty of other ESC's made for up to 14s, and some that will take 15s.

Assuming a prop constant of 1.2 (typical for a normal 2-bladed propeller) a 18x20 @10000 rpm requires an input power of about 10 kW, while a 20x20 @10000 rpm requires about 16 kW.
Ear protection mandatory.

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Old 06-21-2011, 02:02 PM
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Default RE: 18x18 - 20x20 prop 10,000 rpm

Thanks guys i think i will end up using a DA 85 or a ZDZ 90 with a real tuned pipe.
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Old 06-21-2011, 04:10 PM
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Default RE: 18x18 - 20x20 prop 10,000 rpm

Are you sure about being able to tailor the gearbox? There was a time when most gear box equiped motors were offered in a handfull of gear ratios. Last I checked 6.7:1 was all that was available. I do know at one time Neu and Hacker both offered 5.2:1 because I owned that ratio from both MFGs. The most flexable gearbox out there is no longer made. It was from MEC and they offered a wide range of pinions and 3 or 4 different spur gears. They were loud but they made your motors very flexable from one plane to the next..... These days motors are basically one trick ponies.... give or take a cell.


ORIGINAL: 2Sunny

A Plettenberg 30-9 on 12S would put you in that range:


3.7 volts nominal x 12S = 44v

44v x 235 kv = 10340 RPM theoretical

subtract 10% for estimated actual and you have 9500 RPM more or less and then I would say based on a 20x13 using 90 amp I'd ballpark a 20x20 at 120 amps which puts you over 5000 watts output. I'd bet the Pletty can handle that for a burst, but that'd be a heck of a load if it was constant.


On the flip side a Neu F3A would do the same and you could tailor a gearbox to your exact specifications.


Both motors are available at [link=http://www.f3aunlimited.com/webstore/index.php?main_page=index&cPath=9&zenid=h4n8u6qvi9 lcfu2up6edpgcn41]F3AUnlimited.com[/link]



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Old 06-22-2011, 01:14 AM
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Default RE: 18x18 - 20x20 prop 10,000 rpm

Neu offer the P62 gearbox (Super Heavy Duty) for the 22-series with various gear ratios, 3.7, 4.2, 5.2 and 6.7. All other than 6.7:1 are "special order".
And for the 10-16 kW needed to do the specified job, the 2230 would be required.
(And a DA85 or ZDZ 90 would not be able to spin a 20x20 at 10000 rpm.)

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