How to trim a v-bottom at high speed?
#1
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How to trim a v-bottom at high speed?
We drove our FORMULA 353 Fastech by rough water
up to speed about 85 mls/h.
In that time I try to find the best set up between speed, RPM
and comfort. I asked me how would a race driver trim the
boat. The Drives more in or out, Trim Tabs up or down?
I would like to learn more about driving.
Thanks for any information!
Joe
up to speed about 85 mls/h.
In that time I try to find the best set up between speed, RPM
and comfort. I asked me how would a race driver trim the
boat. The Drives more in or out, Trim Tabs up or down?
I would like to learn more about driving.
Thanks for any information!
Joe
#2
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Location: Denmark and hopefully some place nice
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Welcome to OSO. Well it's not an easy question to answer. People drive their boats differently, and all boats are different..
One thing I would suggest is, to sign up for Tres Martins driving school. There you can learn alot about your boat and how to drive it fast and safe.
Also. If you haven't, try posting your question in the Formula forum.
One thing I would suggest is, to sign up for Tres Martins driving school. There you can learn alot about your boat and how to drive it fast and safe.
Also. If you haven't, try posting your question in the Formula forum.
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Keep trimming up the drives until you find max rpm and speed. When the speed drops but the rpm keeps rising you are over trimmed. Tabs are for leveling the boat only unless you are in rough seas and not looking for max speed.
#4
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I like to use drive trim more than tab, but thats just me. Obviously there are scenerios where running a little tab improves the ride/handling. Big water, head seas, I'll run the drives neutral or slightly negative, maybe a bit of tab. Following seas, I normally run drives nuetral or a bit positive, and no tab.
Following seas, too much negative trim, or too much tab=STUFF.
My theory on tabs is that say you are running thru some chop. The tabs work to keep the bow planted thru the chop. But in big water, where the boat is really airing out, when it lands back into the water transom first, the tabs being down will want to violently slam the nose back down. Where as keeping the tabs level or up, and the drives negative, when it re-enters the water transom first, the bow will come down more naturally, without "tripping" if that makes any sense. Not too mention that if the boat tends to land more towards the port or starboard side, the excessive negative tab can really upset the landing.
I guess what I am saying, is too much negative tab can be dangerous at high speeds.. I would like to take Tres driving course though, and learn the right way.
Following seas, too much negative trim, or too much tab=STUFF.
My theory on tabs is that say you are running thru some chop. The tabs work to keep the bow planted thru the chop. But in big water, where the boat is really airing out, when it lands back into the water transom first, the tabs being down will want to violently slam the nose back down. Where as keeping the tabs level or up, and the drives negative, when it re-enters the water transom first, the bow will come down more naturally, without "tripping" if that makes any sense. Not too mention that if the boat tends to land more towards the port or starboard side, the excessive negative tab can really upset the landing.
I guess what I am saying, is too much negative tab can be dangerous at high speeds.. I would like to take Tres driving course though, and learn the right way.
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We drove our FORMULA 353 Fastech by rough water
up to speed about 85 mls/h.
In that time I try to find the best set up between speed, RPM
and comfort. I asked me how would a race driver trim the
boat. The Drives more in or out, Trim Tabs up or down?
I would like to learn more about driving.
Thanks for any information!
Joe
up to speed about 85 mls/h.
In that time I try to find the best set up between speed, RPM
and comfort. I asked me how would a race driver trim the
boat. The Drives more in or out, Trim Tabs up or down?
I would like to learn more about driving.
Thanks for any information!
Joe
#7
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Index your drives and tabs so you know where neutral is. Assuming its a twin step run with the drives even or a lil up. Use the tabs in big water to settle the boat.
#8
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A FasTech is not a Vee Bottom. A FasTech is a STEPPED Vee. There's a difference.
But as has been stated, for top speed pull the tabs all the way up out of the water, run wide open throttle at slightly negative trim and then start bumping the trim up, allowing the boat to settle after each change. Watch the GPS and note the trim setting that delivers top speed.
Also, turning a step-bottom at high speeds can be dangerous if you aren't used to the boat. Trimming "in" and bringing the bow down while turning can result in a spin. Don't drive aggressively until you are familiar with your boat's habits.
MC
But as has been stated, for top speed pull the tabs all the way up out of the water, run wide open throttle at slightly negative trim and then start bumping the trim up, allowing the boat to settle after each change. Watch the GPS and note the trim setting that delivers top speed.
Also, turning a step-bottom at high speeds can be dangerous if you aren't used to the boat. Trimming "in" and bringing the bow down while turning can result in a spin. Don't drive aggressively until you are familiar with your boat's habits.
MC