dexterherndon wrote:Great idea with the build, Every one wants a super light weight motor with tons of speed and power. Copperheads are great but the one down side to mine is it does not have a clutch. I would give dixie mud motors a call and see if he could use the affordable go carts engine on one of his frames. I bet the modded 13hp engine on his 12hp frame with clutch would be one bad a** motor. Or at least thats the idea I have been throwin around. Keep us posted this has caught my interest.
sftull, try to stick to a stock set up (motor), i've had mod motors ,there great until they start comming apart, nothing like stock when you out in 15 degrees and it don't break down ,the more you push the limits, less time you get out of them, unless your a gear head and like messing and wrenching them ,good luck
Run a 1.5/1and maybe even a 2/1 belt reduction to get the prop spinning slower with more pitch.
sftull wrote:Run a 1.5/1and maybe even a 2/1 belt reduction to get the prop spinning slower with more pitch.
I was planning on using a 22 tooth engine pulley and a 32 or 34 drive shaft pulley from http://www.mcmaster.com/#timing-belt-pulleys/=exmgtf If that doesn't work, then I could always go with a 44 tooth on the lower end.
What is everyone's opinion on prop size? After looking at the mudbuddy site, they recommend a 11x10 for a 21hp vanguard.
Do you think the 10x8 would be a better fit?
p.s. Ordered a 16hp clone today. No tax and free shipping...
aeonstar wrote:ok a couple things here....30hp is a lot of power and if you run a little motor that has that much done it will just explode. Remember that marine applications are constant load. It's not the same as a on and off load that a kart would see.
Run a 1.5/1and maybe even a 2/1 belt reduction to get the prop spinning slower with more pitch. Small motors do not make torque like a big 1000cc vanguard does. If you want a small motor to push as hard as a big one you need to multiply your torque and spin the motor faster. A stock prodrive spins a 1.5/1 reduction
go here for all your parts. they have every thing you need to build anything from a mud motor to a space shuttle.
harryhyde wrote:Here's an idea to try if the 16 hp doesn't work out, and you aren't broke yet. I have been batting this idea around in my mind, then all of a sudden it showed up in Wildfowl magazine several issues back as a boat design winner.
Make a mud motor out of a snowmobile engine. The guy in the article used an Arctic Cat 340cc engine, which probably has close to 40 hp. If you used say a 440 or 500 fan, you would have close to 50 hp, but only use 30 of it so your reliability and gas economy doesn't suffer.
I am just dying for a tree to fall on the back end of my Ski-Doo Touring 500, because I already have a large chainbox/ drive tube and prop that can be used with the motor. I am pretty sure I could put it together for less than 150 lbs, and have 48 HP.
McMaster-Carr doesn't do well with links. Which belt/pulley combination are you going with? 30hp is a lot of power so you need to make sure you choose the right pulley tooth profile and belt width to survive.
sftull wrote:McMaster-Carr doesn't do well with links. Which belt/pulley combination are you going with? 30hp is a lot of power so you need to make sure you choose the right pulley tooth profile and belt width to survive.
8 mm pitch pulley x 30mm wide. The pulley on the top will be a 22 tooth and the bottom will vary. Will that work?