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Forum: Speed - RC Nitro Boats

12-08-2016, 04:32 PM

Replies: 19

7.5cc O/B tunnel hull set-up questio

Views: 8,159

Posted By ob nut

Best for any motor are new bearings,...

Best for any motor are new bearings, seals/gaskets. Turbo the crank, clean up the cylinder ports for better flow. The lower needs a sharp front and flat bottom. The bottom should be close to how the...

Forum: Speed - RC Nitro Boats

12-08-2016, 11:40 AM

Replies: 19

7.5cc O/B tunnel hull set-up questio

Views: 8,159

Posted By ob nut

After dropping off the face of the earth for 5...

After dropping off the face of the earth for 5 years, I myself returned back to running/racing my tunnels. With new boats, had some issues with adjusting the depth. Met a good man at a race this year...

Forum: Speed - RC Nitro Boats

03-24-2009, 03:26 AM

Replies: 19

7.5cc O/B tunnel hull set-up questio

Views: 8,159

Posted By ob nut

RE: 7.5cc O/B tunnel hull set-up questio

Prop to deep - boat will "plow" thru the water. prop to high - boat will be "flighty".. The full size racing tunnels also run the prop half submerged. This allows the motor to rev up..

Good...

Forum: Speed - RC Nitro Boats

03-24-2009, 12:29 AM

Replies: 19

7.5cc O/B tunnel hull set-up questio

Views: 8,159

Posted By ob nut

RE: 7.5cc O/B tunnel hull set-up questio

Yepper.. It's a starting point. Might need to go up a bit.

Forum: Speed - RC Nitro Boats

03-23-2009, 09:55 PM

Replies: 19

7.5cc O/B tunnel hull set-up questio

Views: 8,159

Posted By ob nut

RE: 7.5cc O/B tunnel hull set-up questio

Most of the current "race" boats out will always start around the prop line at 1/8" +/- above the spoon bottoms. With that, about 1 degree neg on the thrust angle. Start with that and work the setup....

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