Bench tested some props - same power, more thrust? - Page 2 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 09-24-2015, 08:19 PM   #11
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Re: Bench tested some props - same power, more thrust?

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Originally Posted by OLD PRAIRIE RED NECK View Post
Did you try an APC 12.25 x 3.75? My all time favorite .40 size glow trainer prop!
sorry, yes it was THAT prop, OS46LA
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Old 09-27-2015, 09:49 AM   #12
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Re: Bench tested some props - same power, more thrust?

Originally Posted by moo View Post
sorry, yes it was THAT prop, OS46LA
One of the best kept secrets in out hobby!
Hang time does not apply to ceiling fans, light fixtures, overhead door tracks or basketball nets!
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Old 10-03-2015, 01:08 PM   #13
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Re: Bench tested some props - same power, more thrust?

Hey all!
So after assembling the Teksumo, it was way to fast for me to fly, so I DIY'd a slightly smaller wing with a much better wing loading (5.9oz/sq.ft) and I got her dialed in this morning.

I'm running an Emax CF2822/1200Kv motor swinging an APC 7x3.8SFW. There is a very wide speed range between 35% ~ 65% throttle, but if I push out the throttle slowly to max, she doesn't seem to go faster, but makes a rather loud noise. Is this a prop stall?

Should I switch to a 7x4E or 7x5E? Or even 8x4E? I actually care less for speed - I want my throttle to have more granularity, and not be limited to a very small area of movement on the throttle.

Ecalc indicates that moving to a higher pitch prop decreases runtime and increases top end speed. Alternatively, I put in a smaller 80w motor (Cobra 2204/58 1080Kv) and the runtime goes up a fair bit, and the top speed also goes down, so perhaps I could have more throttle range use?

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Old 10-03-2015, 05:28 PM   #14
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Re: Bench tested some props - same power, more thrust?

quite often users dwell too much on thrust and forget about airspeed as they both have to work hand in hand. Meaning if the pitch is very low with a long prop ; yes you will have gobs of thrust but little airspeed to get your aircraft flying. On the other extreme if you go with a short prop and lots of pitch ; the airspeed is there but no thrust. Has to be a happy medium. As suggest earlier, Ecalc and others are a good starting point and then it gets down to actual prop testing to get the most efficient prop for your application.
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