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Building a Slow Stick from scratch

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airwave View Drop Down
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  Quote airwave Quote  Post ReplyReply Direct Link To This Post Posted: 31/Jan/2012 at 1:49pm
The GWS motor will take 100 watts with or with out the gear drive. The prop size with out is 5x4~6x3 the prop size with a 3 to 1 gear drive is 10x6 DD. if you were to use a 5 to 1 drive it would be a lot bigger. The bigger the prop the more thrust is made for the same watts in general

Flying Weight
405~440 g (14.3~15.5 oz)
Rule of tomb is 100 watts per LB 40 watts would give an all up weight
Of only 6.4 OZ
They do have a double motor gear drive?
It is for the 100/350 size motors
As snappy has said the cost of a motor at HK is so low it would not make sense to get a gear dive at ~$10 each
The ESC (brushed) is cheaper and I use it all the time on a lot of my GWS kits. It is just as easy to use and the other components do not cost as much. You can make 2X6 cell NIMH (7.2 volt) battery for ~$12 and when the kit comes with a 400 EPS it’s the fastest and easiest to do

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  Quote airwave Quote  Post ReplyReply Direct Link To This Post Posted: 31/Jan/2012 at 2:03pm
PROPELLER                      Thrust     Thrust Power (w)          
              volt      Amps    (g)     (oz)      (W)       
EP6030          7.2     9.8      318     11.22      70.56       
EP6030          8.4     11       360     12.7       92.4     
EP6030          9.6     13.8     430     15.17     132.48       
EP7035          7.2     11.3     340     11.99      81.36       
EP7035          8.4     13.3     410     14.46     111.72       
                                   
If you look at the spects above you will see at 7.2 volt it makes 9.8 amps and 70 watts 6x3 prop 318 grames or 11.22 OZ.

with the same prop at 9.6volts it pulles 13.8 amps and 132.48 watts

they do have a pico stick that is smaller than the other one??
pico stick

Edited by airwave - 31/Jan/2012 at 2:16pm
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ICEMAN1944 View Drop Down
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  Quote ICEMAN1944 Quote  Post ReplyReply Direct Link To This Post Posted: 31/Jan/2012 at 9:13pm
Thanks for the specs. I think I will try the EP6030 or the EP7035 without gear reduction.

Also, I may have read the specs incorrectly for the XFLy. At maximum power, the specs also states that it can pull 12.5 Amps at 6 Volts. This equals to 75 Watts.

I am beginning to understand that the power output of a motor is greatly influenced by the type of propellor that I use.

What should I be careful of when running the motor so that it does not burn out? Volts or amps? If the motor is rated at 7.2 Volts and I keep within this voltage then I should be fine. Right?
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  Quote airwave Quote  Post ReplyReply Direct Link To This Post Posted: 01/Feb/2012 at 6:49am
Amps is the big heat maker,bushes wire ect. will heatup on amps.volts is the RPM maker bearings,prop balance,motor balance comes in to play.
as RPM goes up so does the load and then the need for a smaller prop
12.5 anmps is real close to the spec for gws.Efficiency drops as prop size gets smaller.this is how a motor at 6.9 amps can make the same thrust as the 6x3 at almost 10 amps.on this type of motor it has small brushes that can heat and fail at higher amperage you will see a blue arc in side of it as it turns, when it becomes noticabley larger you are close to max amps
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