Originally Posted by
hughb
Thanks Mic I'm sure this will help many, including myself who is making a tunnel hull at the moment.
Where would you say is the best place to start for mounting the outboard? I had read to start have the centreline of the prop in line with the bottom of the sponsons, and allow adjustment both up and down from that position. Also where is a good COG position?
You have it right on centerline then up or down plus trim in and out. As for CG I have set up dozens of tunnels Nitro, gas and FE. Set multiple world records and I don't know the CG on any boat in my shop. Every boat, prop and lower are different. FE is easier to find the sweet spot as moving a battery slightly fore and aft affects a large weight change percentage. Actual CG effect changes with trim angle of the lower and prop characteristics that's why I do not use it. Maybe and after 50 + boats in 40 years I just have a good sense of windage. Play with weight changes and learn to recognize how it affects ride and cornering. The more you try the more you learn.
Mic
Mic Halbrehder
IMPBA 8656
NAMBA 1414
Bookmarks