Transom Height and Mud motor HP

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Transom Height and Mud motor HP

Postby MeatDog » Thu Oct 24, 2013 11:58 am

I am wanting to build a mud motor for my Lowe 1648. The transom height is 19". Would a long tail work with this height?

I'm also trying to figure out horsepower. I've got 500lbs of man plus dog and gear. What size motor should I run? I'm not looking to win a race but I don't want to be bogged down either.

Thanks in advance!
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Re: Transom Height and Mud motor HP

Postby dogyak » Thu Oct 24, 2013 7:38 pm

A friend has a 6.5 hp mud motor (swamp runner kit) on a 14 ft . With 2 guys , decoys , and other stuff he gets 13 MPH . Hope this helps some . The transom is fine for the longtail . I have a Lowes 8 ft riverboat that I run a longtail on . Good luck !
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Re: Transom Height and Mud motor HP

Postby GMag10 » Fri Oct 25, 2013 12:32 pm

Longtail will work just fine with that height. You may just have to go to a bit longer shaft.

I would go 23 hp minimum on a 1648.
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Re: Transom Height and Mud motor HP

Postby Mark F. Cheney » Fri Oct 25, 2013 4:09 pm

Most large HP long tails - 14 HP and up, use a 72" drive shaft Many of those are mounted on tall transoms. Occasionally some one wants a 84" drive shaft for a tall transom. The theory is the narrower the angle of water to drive shaft the greater the forward thrust you get. This variable can be expressed trigonometrical but It has been too long out of school for me to remember how to do it. You can probably feel the difference between a 72" and a 84" drive shaft on the same boat.

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Re: Transom Height and Mud motor HP

Postby MeatDog » Mon Oct 28, 2013 9:21 am

Great info. Don't do the math Mark, I get what you're saying, ha! Thanks again.
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Re: Transom Height and Mud motor HP

Postby Rhock19 » Thu Oct 31, 2013 11:31 am

i run a 18 hp on a 1448 lowe with a tall transom. Mine is a 84 in shaft and thats what i recommend for a tall transom. Ive seen them with a 72 in shaft and they lose a lot of top end. I would go minimum 18 hp, i run 20 empty but loaded it goes about 14 15. a 23 vanguard would be a great choice. lots of torque and plenty of possible upgrades out there

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Re: Transom Height and Mud motor HP

Postby Delta1389 » Tue Nov 05, 2013 4:27 pm

Go devil reccomends a 16" transom for their standard longtail. They do make a tall transom model. You need to either cut down your transom some or go with a longer shaft. You will loose a lot of top end and overall performance if your transom height and shaft length don't match up. The angle will be too steep.
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