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dumas air boat help

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Old 09-21-2017, 06:58 PM
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handyman
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Default dumas air boat help

built a big swamp ...elect power...3 blade 10x6....650 watt output 1100 kv with 3 cell battery..........heres the problem....twin air rudder left and rights both the same throw...wont turn left.......turns right just fine.............motor is set up stright on..nose of motor is piched up a bit...boat sits level in water............HELP
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Old 09-22-2017, 02:34 AM
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Bigger rudders. You want the height covering at least half the prop blast and twice that depth. The deeper the rudder the more responsive they'll be.
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Old 09-22-2017, 08:22 AM
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thanks.....what about the angle of the motor.should that be stright on or angle up....?
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Old 09-22-2017, 06:03 PM
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Quote:
Originally Posted by handyman View Post
thanks.....what about the angle of the motor.should that be stright on or angle up....?
Have your thrust line parallel to the waters surface on plane. It will take some experimenting to get this part just right. Generally, I set my engines to have he prop shaft parallel to the keel of the boat which generally is parallel to the water when underway.
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Old 09-22-2017, 06:20 PM
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thanks...whats better 3 blade or 2 blade........i started off with 3 blade but with the problem of turning didnt get to far....
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Old 09-22-2017, 09:00 PM
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I only use 2-blade props. Cheaper, more choices, and more efficient.

Dont use wood props on airboats in case you have already. It ends real badly when the prop hits water at rpm and blows apart. Stick to APC, or at the least, Master Airscrew props. The former is the best IMO.
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Old 09-23-2017, 03:14 PM
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Exactly what motor are you using? The “watt output” means little. Regardless, that prop is-probably not the best for the motor unless it is a pretty large one. Too, exactly what ESC and cells are you running?

The reason for poor left turning is usually due to prop torque. As above, larger rudders will help. So will a smaller prop, but we need the above info to make an intelligent recommendation.


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Last edited by Got RPM; 09-23-2017 at 03:16 PM.
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Old 09-24-2017, 01:50 AM
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I have several airboats that turn right as well as they turn left. Prop torque is a thing, but not as influential as it's made to be in a lot of cases. Make the rudders bigger (deeper) and that should fix it up pretty good.
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