mini airboat

[chancer]

I did not know Doug made air boats. BTW the Dilithium Crystals only work with the Tyranasaurus rex V16

 

[rocketkart]

captain spock gave me some hes Dilithium Crystals befor he past. r.i.p Leonard Simon Nimoy. 1931 to 2015

 

[Poboy kartman]

I did not know Doug made air boats. BTW the Dilithium Crystals only work with the Tyranasaurus rex V16

Of course I do....no Dilithium Crystals needed.....(but you do need a heck of a long extension cord...)..

 

[chancer]

Why do I have a feeling that fan was already sitting on that boat, and all you had to do was take a picture!

 

[rocketkart]

lol

 

[J_Walker]

meanwhile... my next project......

https://youtu.be/dhL-tGNt_D8?t=5m39s

 

[rocketkart]

had some time to get the engine out the other day and i new it probably wouldn't start cus it has set for a while and it did just that. dint want to start so i cleaned the carb still wont start i got spark. check the intake manifold for any leaks and still nothing. i hate this ****ing engine. never had a briggs be so ****ing stubborn befor and kind of inbarest to ask for your opinion on wtf is going on with this engine cus i will introduce it to my sledgehammer. i know i cleaned the carb good so idk what it can be????????? engine Model 246435-0111

 

[chancer]

Dude you sound like me! before I got into go Karts and actually wanted to learn about small engines. I have threatened a sledgehammer and "set the f'n thing on fire many a times!!!!
Sorry I still do not know enough to help other than to say walk away and calm down, but I am feeling your frustration.
"Put down the wrench and come out with your hands up"

 

[rocketkart]

Dude you sound like me! before I got into go Karts and actually wanted to learn about small engines. I have threatened a sledgehammer and "set the f'n thing on fire many a times!!!!
Sorry I still do not know enough to help other than to say walk away and calm down, but I am feeling your frustration.
"Put down the wrench and come out with your hands up"

 

[rocketkart]

i changed the rigging around some.

 

[landuse]

Looking good

 

[rocketkart]

you think this is any good to spin at about 3600 rpm. its Balanced but just dont know if it will hold up to the rpm's. it's aluminum 1/8 thick 2'' wide 3ft long. got the idea frome some guys that makes them for there giant rc airplanes.

 

[Poboy kartman]

Honestly, it'll spin.....but I doubt it'll move the boat much ......

 

[rocketkart]

i got the pich set. why dont you think it will move tho?

 

[chancer]

Dude! I love the way your thread just walks away from the Frustrating engine and moves on to propellers and rigging!
I don't think 1/8 aluminum will hold up, It seems to thin and would flex at rpms. Then again centrifugal force. Shrugs.

 

[rocketkart]

I'm going to let her rip anyway and see what I got. Thanks chancer. there's these guys that build propellers for these giant 80CC 2stroke engines out at the air range. thought it was cool.

 

[Badot]

To figure out if it'll hold up to the revs is pretty simple -- just find the centripetal force of the blades and divide it by your cross section at the hub (weakest point in your design). I'd definitely suggest punching the numbers before risking chucking pieces of aluminum through the air at a few hundred miles per hour. Especially thin pieces like that as they have a decent tendency to curve in rather random directions after launch.

The design itself should make okay airflow but it would be fairly inefficient. A simple mod to get better power would be to twist the blades to get a consistent pitch throughout the length. If you want to go crazy an airfoil shaped blade will be much more efficient than a flat one as well.

 

[Desertduler]

 

[266101463]

Those things look awesome! I would love to go bass fishing in one of those, of course I won't catch anything.

 

[Poboy kartman]

To figure out if it'll hold up to the revs is pretty simple -- just find the centripetal force of the blades and divide it by your cross section at the hub (weakest point in your design). I'd definitely suggest punching the numbers before risking chucking pieces of aluminum through the air at a few hundred miles per hour. Especially thin pieces like that as they have a decent tendency to curve in rather random directions after launch.

The design itself should make okay airflow but it would be fairly inefficient. A simple mod to get better power would be to twist the blades to get a consistent pitch throughout the length. If you want to go crazy an airfoil shaped blade will be much more efficient than a flat one as well.

Thanks....all the things I was thinking.....somehow....this thread fell through the cracks and I never got back to it.....