So now that the Nytro is about finished for the next season, it is time to start this winters project: a mini aluminum hull jet boat powered by my 09 nytro motor.
Over the summer i have slowly been gathering parts and tools to get started. The pump is out of a yamaha gp 1200 jet ski.
Here is the start:
I hope this build is ok to post in the garage section being that it is powered by a yamaha.
Over the summer i have slowly been gathering parts and tools to get started. The pump is out of a yamaha gp 1200 jet ski.
Here is the start:
I hope this build is ok to post in the garage section being that it is powered by a yamaha.
raginyamaha
TY 4 Stroke Master
it should be allowed because it just cool!!
kinger
VIP Member
Ahhhhh AWESOME
Slowly making progress, but not much to show for it. All the time has been working on getting a proper model that i can lay flat for the patterns.
Getting closer to a final design. Still need to add the interior, winscreen, and pump intake.
natedawgedog
TY 4 Stroke Guru
Sweet!
I've got a couple questions for you, how are you connecting the stubshaft to the marine coupler? Also are you planning on some sort of gear reduction?
I'm asking because I've thought about doing this also but when I bring it up in any jetboating forums they tell me the to keep the pump from cavitating it should be spinning at less than 7k,and the nytro motor would be leaving a ton of hp on the table when peak power is made at around 9k.
I've got a couple questions for you, how are you connecting the stubshaft to the marine coupler? Also are you planning on some sort of gear reduction?
I'm asking because I've thought about doing this also but when I bring it up in any jetboating forums they tell me the to keep the pump from cavitating it should be spinning at less than 7k,and the nytro motor would be leaving a ton of hp on the table when peak power is made at around 9k.
natedawgedog said:
My honest answer is yes you are correct. We are just going to connect using a modified coupler and hopefully be able to tune the impeller and intake size to allow the extra rpm. I have came across 1 or 2 success stories of spinning them 8K. I know the nytro motor will have plenty on the low end as well. I am kinda shooting in the dark here so if anyone has further knowledge than i do on the subject feel free to chime in.
Lee
natedawgedog
TY 4 Stroke Guru
there is a pump in the works or already available made by scott waterjet http://www.scottjet.co.nz/products/jet_612.html that is supposed to be able to handle those type of rpms without cavitation but man is it expensive! also you can look in home-built/experimental aircraft forums were there is 1 or 2 guys that successfully added custom gear reduction units to the nytro motors to get them to spin at the right rpms. a little bit more weight but I would believe that having the power in the sweet spots would more than make up for the weight penalty.
Im excited to see what you have in store for this build!
Im excited to see what you have in store for this build!
natedawgedog
TY 4 Stroke Guru
after a quick search here was the site for the airplane thread and I guess there are more people doing this now with the FI motors with turbos and all! its been awhile since Ive looked into these but this long thread has info on the gear reduction units they made and they are very helpful with info too.
http://www.rotaryforum.com/forum/showthread.php?t=16100
http://www.rotaryforum.com/forum/showthread.php?t=16100
natedawgedog said:
Tha Thread was a great read thanks!
Got a little further today
And so it begins.
I think its time i make the wife park outside.
Lots of progress over the weekend.
Had to get creative with my filler rod. Since i ran out mid weekend of the larger stuff.
Had to get creative with my filler rod. Since i ran out mid weekend of the larger stuff.
yamahamm
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cool project 
Irv
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yamahamm said:cool project
X2
Great job Lee, looking forward to seeing the pics when it is all done.
Just to help with your progress, I thought this might inspire you to see it to completion? (It's a different animal, but still a cool Jet boat none the less)
