Prop size

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Prop size

Postby Jdmagoo » Sat Jan 18, 2014 11:26 pm

Just wondering what people are using to calculate the appropriate prop size for their hexa?

My hexa has an AUW of 3.5kgs and I'm using tiger motors 11x3.7 carbon props. It hovers at around 60 - 65% of throttle. I have read that I should be aiming for a 50% throttle hover! is this correct?

I'm using the following:

- tiger motor 700kv MN3110-17 motors
- 4s battery
- AUW 3500 grams including payload and batt

The problem I have is it seems very slow to react to fast movements and it also had a case of the divergence problem as listed on the forum. I have never seen my craft do this before, but I have changed the props to a lower pitched prop.

If I need to purchase the 12x 4 tiger motors props to fix the problem, I will, but don't want to waste to much more money.

Also I'm considering copying teramax and make an X8 as I have had to many issues trying to get the right prop combo for this setup

Thanks for your replies

James
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Re: Prop size

Postby bluuu » Sun Jan 19, 2014 12:05 am

12x4 will be good
ECALC calculated hover at 48%
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Re: Prop size

Postby Jdmagoo » Sun Jan 19, 2014 5:33 am

bluuu wrote:12x4 will be good
ECALC calculated hover at 48%


Thanks heaps for that,

Are you able to attach the ecalc calculations please, there are a few areas I'm not sure what to fill out.

Thanks again

James
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Re: Prop size

Postby bluuu » Sun Jan 19, 2014 1:57 pm

http://ecalc.ch/xcoptercalc.htm?ecalc&l ... -17&gear=1

you must enter by hand proppeler size
leave custom and enter diameter and pitch
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Re: Prop size

Postby Jdmagoo » Sun Jan 19, 2014 7:52 pm

bluuu wrote:http://ecalc.ch/xcoptercalc.htm?ecalc&lang=en&cooling=2.5&rotornumber=6&weight=3500&calc=auw&elevation=500&airtemp=25&qnh=1013&batteries=lipo_6000mah_-_65/100c&chargestate=0&s=4&p=1&esc=max_30a&motor=tiger_motor&type=46|mn3110-17&gear=1

you must enter by hand proppeler size
leave custom and enter diameter and pitch


For the number of props do I enter 6 because it's a hexa or do I leave it as a the default of 2?

Thanks again

James
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Re: Prop size

Postby kinderkram » Sun Jan 19, 2014 10:39 pm

Jdmagoo wrote:
bluuu wrote:http://ecalc.ch/xcoptercalc.htm?ecalc&lang=en&cooling=2.5&rotornumber=6&weight=3500&calc=auw&elevation=500&airtemp=25&qnh=1013&batteries=lipo_6000mah_-_65/100c&chargestate=0&s=4&p=1&esc=max_30a&motor=tiger_motor&type=46|mn3110-17&gear=1

you must enter by hand proppeler size
leave custom and enter diameter and pitch


For the number of props do I enter 6 because it's a hexa or do I leave it as a the default of 2?

Thanks again

James

It´s number of blades, not props. Standard props have 2 blades. ;)
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