ENGINES HEIGHT + X DIMENSIONS (With pictures)
01-12-2022, 06:33 AM
#21
Registered
There is also a steering method to counter act chine walk in a vee bottom.
Its called steering chop.
When the hull starts to rock left, turn the wheel slightly to the right.
When the hull starts to rock to the right, crank in some left wheel.
All rigs are different and you’ll have to figure out what yours wants.
Some it’s fairly aggressive, some are very mild.
When you get used to it, you’ll almost sense what it’s going to do before it does it.
The 24’ Sonic I referred to above was the first of two I’ve owned/rigged.
I now have a twin OB 25’ Checkmate and it is way more difficult to drive fast/straight than the Sonics we’re.
When it starts to chine walk, it is so violent it is trying to throw you out of the boat!
W/steering chop, I can still drive it straight.
I am still working on set up on it.
None of the three have had solid mounts which does not help.
BTW, the Checkmate is 6” narrower than the Sonics were.
This aggravates the situation.
Setting motor height on a twin engine vee is complicated.
You have to guesstimate how much your hull lifts at speed to know where your props/gear cases will be.
My target is to have prop shafts even w/water at speed.
Its called steering chop.
When the hull starts to rock left, turn the wheel slightly to the right.
When the hull starts to rock to the right, crank in some left wheel.
All rigs are different and you’ll have to figure out what yours wants.
Some it’s fairly aggressive, some are very mild.
When you get used to it, you’ll almost sense what it’s going to do before it does it.
The 24’ Sonic I referred to above was the first of two I’ve owned/rigged.
I now have a twin OB 25’ Checkmate and it is way more difficult to drive fast/straight than the Sonics we’re.
When it starts to chine walk, it is so violent it is trying to throw you out of the boat!
W/steering chop, I can still drive it straight.
I am still working on set up on it.
None of the three have had solid mounts which does not help.
BTW, the Checkmate is 6” narrower than the Sonics were.
This aggravates the situation.
Setting motor height on a twin engine vee is complicated.
You have to guesstimate how much your hull lifts at speed to know where your props/gear cases will be.
My target is to have prop shafts even w/water at speed.
01-12-2022, 08:11 AM
#22
Registered
Thread Starter
#Twin O/B Sonic
Thanks mate!
Yes, I’m improving my “drive trough the wild” skills, as I have been reading eeeverything about.
What works good for me is the “chop chop” technique. Your left hand at 10 and vertical chops like cutting carrots.
My boat use to unbalance to starboard, soo I chop to correct to portside. I drive from begging of chinewalk (55MPH) till 62MPH, more I can’t.
My plan with the mods is run stable till 62-64 (with tabs and negative trim) then improve driving trough to get closer to 70.
Which props have you been running and top speed? If you have a post with the characteristics of that boat and your experience, please let a link here.
Thanks again
Thanks mate!
Yes, I’m improving my “drive trough the wild” skills, as I have been reading eeeverything about.
What works good for me is the “chop chop” technique. Your left hand at 10 and vertical chops like cutting carrots.
My boat use to unbalance to starboard, soo I chop to correct to portside. I drive from begging of chinewalk (55MPH) till 62MPH, more I can’t.
My plan with the mods is run stable till 62-64 (with tabs and negative trim) then improve driving trough to get closer to 70.
Which props have you been running and top speed? If you have a post with the characteristics of that boat and your experience, please let a link here.
Thanks again
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Twin O/B Sonic (01-13-2022)
01-13-2022, 06:18 AM
#23
Registered
Here you go.
This is on my current Checkmate build.
Unfortunately not much performance info as I’m just finishing it up.
https://www.facebook.com/marketplace...tory_type=post
You can go to screamandfly.com and search “Sonic twin o/b” there and get much more info.
Be aware, I did threads on builds on two different twin OB 24’ Sonic builds.
Tons of info between the two on there.
OSO is 99.9% IO only.
Scream and fly is 99.9% OB.
This is on my current Checkmate build.
Unfortunately not much performance info as I’m just finishing it up.
https://www.facebook.com/marketplace...tory_type=post
You can go to screamandfly.com and search “Sonic twin o/b” there and get much more info.
Be aware, I did threads on builds on two different twin OB 24’ Sonic builds.
Tons of info between the two on there.
OSO is 99.9% IO only.
Scream and fly is 99.9% OB.
#Twin O/B Sonic
Thanks mate!
Yes, I’m improving my “drive trough the wild” skills, as I have been reading eeeverything about.
What works good for me is the “chop chop” technique. Your left hand at 10 and vertical chops like cutting carrots.
My boat use to unbalance to starboard, soo I chop to correct to portside. I drive from begging of chinewalk (55MPH) till 62MPH, more I can’t.
My plan with the mods is run stable till 62-64 (with tabs and negative trim) then improve driving trough to get closer to 70.
Which props have you been running and top speed? If you have a post with the characteristics of that boat and your experience, please let a link here.
Thanks again
Thanks mate!
Yes, I’m improving my “drive trough the wild” skills, as I have been reading eeeverything about.
What works good for me is the “chop chop” technique. Your left hand at 10 and vertical chops like cutting carrots.
My boat use to unbalance to starboard, soo I chop to correct to portside. I drive from begging of chinewalk (55MPH) till 62MPH, more I can’t.
My plan with the mods is run stable till 62-64 (with tabs and negative trim) then improve driving trough to get closer to 70.
Which props have you been running and top speed? If you have a post with the characteristics of that boat and your experience, please let a link here.
Thanks again
Last edited by Twin O/B Sonic; 01-13-2022 at 06:20 AM.
