ANDRIS GOLTS

Hi all designed and built a new air boat last winter .The issue im having at full power when turn right or left the boat spins out i notice the water climbing up both sides of the non-trip chines all the way to the bow. The hull is 21 inches in length with a beam on the top deck at the transom of 8 1/4 inches and the bottom at the transom 5 3/4 this gives a a idea of the non-trip angle .The top deck is flat and the bottom is flat which gently rolls upwards to the bow. I tried moving batteries to the stern to move the c of g rear wards but the water still climbs the non trip chines, I was thinking of glueing 1/8 x1/8 pine strips to the bottom port and starboard sides to see if this would help as strakes, Does anyone have any other suggestion what may solve this problem. Regards Andris Golts.

Got RPM

Airboats spin out because there is nothing to keep them running straight or to prevent sliding in turns - no rudder in the water, no keel, no strakes. Too, excessive air rudder deflection can make this worse. Installing three or four 3mm x 3 mm wood strips in parallel along the bottom (at the chines and in the center) will act S mini-keels and help to reduce the sliding and spinning, as will reducing air rudder deflection….but they probably won’t completely eliminate it. Reducing power and speed in the turns can help too.

Does the water on the sides present a problem? It isn’t directly causing the spinning out. A photo might help.




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Got RPM

I answered your PM.







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ANDRIS GOLTS

Hi RPM i will glue 1/8 x3/16 spruce strips all the way to the bow thankyou. Regards Andris Golts.