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1872 what size fan motor?

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#41 ·
I had a 24hp Honda on my 1872 for many years with no problems at all. Yep there are always times I wished it was bigger. I never ran a reduction because I could not justify the added cost of them and really dont like fan props larger than 42" but to each his own. If you get the bigger crank you can swing a 40" prop without any issues...the Honda is still running stong with the new owner.
 
Discussion starter · #42 ·
RobertP said:
I had a 24hp Honda on my 1872 for many years with no problems at all. Yep there are always times I wished it was bigger. I never ran a reduction because I could not justify the added cost of them and really dont like fan props larger than 42" but to each his own. If you get the bigger crank you can swing a 40" prop without any issues...the Honda is still running stong with the new owner.
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Yea we found a 35 hp rebuilt for cheap and I think we are gonna try that is there anything special you need to do to a motor to get it ready for a fan?
 
#43 ·
Try and find out what size crank is in it. Remember, allthat HP doesn't mean anything if you can't run the right prop pitch. You get thrust from prop pitch, and have to have certain hp to get be able to spin a certain pitched blade, so there is a positive relationship between prop pitch, thrust, and the hp needed to spin the prop that much is easy to understand and common sense. What the key to understanding is its more than just buying a horizontal shaft motor, mounting on a stand, throwing a prop on it and going. Many factors come into play. What size crank does the motor have? What RPM does the motor hp max out at? Props can't spin over a certain rpm. You mat get a 35 hp motor, but that 35 hp might be at a higher rpm which the prop can't handle.
 
#44 ·
And I agree with Robert p you can get a good setup with a smaller HP direct drive, but you have to do some research and be carefull before you just start throwing motors and props together. You'll twist a crank in pieces as BC talked about earlier.
 
#45 ·
clark3 said:
Try and find out what size crank is in it. Remember, allthat HP doesn't mean anything if you can't run the right prop pitch. You get thrust from prop pitch, and have to have certain hp to get be able to spin a certain pitched blade, so there is a positive relationship between prop pitch, thrust, and the hp needed to spin the prop that much is easy to understand and common sense. What the key to understanding is its more than just buying a horizontal shaft motor, mounting on a stand, throwing a prop on it and going. Many factors come into play. What size crank does the motor have? What RPM does the motor hp max out at? Props can't spin over a certain rpm. You mat get a 35 hp motor, but that 35 hp might be at a higher rpm which the prop can't handle.
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yea thats y we wonted to get yals input yal kno alot more about it then we do i mean can prly get one put together and make it run put its not gonna be the right way thanks alot for all the info u r givin its really helpful i think my buddy pmed u about the motor if we was to get that one what would u recomend would be the best prop and stuff to put on it
 
#46 ·
it doesnt matter what size prop or motor your go with, it will be leaps and bounds over a troller. Its kinda like this, im not sure if yall have ever been out of a boat with a ginormo prop and motor but if your havent you wont know what your missing when you have the smaller motor and prop. It will be tons better than a troller...just sayin. BUT it is better to go as big as you can afford at first because like anything if your start small, your gonna want to go bigger later..always happens
 
#48 ·
Like stated, the possibilities are endless. If you PM'd me your budget i would know what you had to work with and could put together some options for you. Powerfin props are great props...youll pay for them too. One of the best set ups in my opinion would be the Rotax 377 with a 2.58 reduction. This motor has 35HP with a max rpm around 6400 rpms, With the reduction it maxes out rpm around 2450- 2500 rpms. You could put a 3 blade 55" series B on it and be more than happy. You could go just about anywhere with that set up. Of course this set up will cost you around 900 bucs just for the blades and hub. Ive seen some used rotax motors with reductions selling in the 1500-2000 range. So almost 3 grand in just motor, prop, and reduction. Then add the fan stand, cables, sprocket sets/gearing and all that and your at an easy4 grand? Now this is pricey but you get the idea, the possibilities are endless. Either way, as long as you have a reasonable budget, nothing extravagant, you can get a good fan set up that will push your boat well
 
#51 ·
According to arrow prop guy...a 28 horse with reduction is equal to 40hp direct drive and so forth. I dont know any more specifics than that...but he said he'll push my boat half way on land. Hope it does...I dont really know if its gonna do it but hes saying 40 yrs of experience hes got. You're gonna wanna save ur cash and get the reduction ...cuz its more expensive at the beginning but when u throw a crank you'll be out of a motor for sure and maybe a fan blade. it costs $700 for just the reduction but a lot more if u breakin stuff. Also the reduction is going to put ur blade at the exact amount of rpm your blade is gonna need for maximum thrust. Its not really the size of your motor but how well the blade will thrust. Ask BC...hes got a 6.5 hp with a correct pitched prop and it will raise some HELL we building this saturday and hopefully it'll be running next week sometime. I'll take pics of how it goes.
 
#52 ·
thanks for the info guys we will deff ask one of yal b4 we buy anything for sure but me a deeppeneratione have been arguing bout it for a week or so now so well have to figure out how much we wont to spend and then get yal to tell us what to get id rather learn from someone elses experence then waste a whole lot of money and time and have the dang thing fall apart we really did not realize that there was so much variables in building one.
 
#53 ·
and one more question on building the fan setup stand and all that i think we pretty well can figure out most of it all except for the motor stand going down to the bearing and how it goes all together right there i think i kinda know but not 100%.
 
#54 ·
blake said:
and one more question on building the fan setup stand and all that i think we pretty well can figure out most of it all except for the motor stand going down to the bearing and how it goes all together right there i think i kinda know but not 100%.
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so yall are taking a trip down south in a couple weeks right? like down to Ozark...... lol
 
Discussion starter · #59 ·
glockmaster35 said:
oh and a quick search on BFC used to tell you everything you need to know about a lake but its all gone now
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Yea I know someone posted that they had seen abuncha numbers but nothing big in size yet when it get a lil warmer we will try it out how far away from it are you?
 
#60 ·
I have a 28HP kawasaki with reduction and 55in arrowprop. I wouldn't change a thing about it. Mine is an 1870

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