Looks pretty good, just needs a ball for the servo linkage and maybe some real thick grease to keep it air tight. It probably uses a ball and not a rod for the valve and the spring on the bottom could also be tightened or loosened to tune it if needed.

Nice looking project . I'd ditch that weedy and get a ZENOAH 300pum from gizmo engines for $260 shipped and it's a 29.5 with a 1048 carb . Mount 5" rails and get the gizmo mounts , 1/4 shunner cable , and speedmaster hardware then your home free.

Bob, on that type you can adjust the tension a little by backing off the screw that holds the spring in place.

Originally Posted by Gavinxman

Nice looking project . I'd ditch that weedy and get a ZENOAH 300pum from gizmo engines for $260 shipped and it's a 29.5 with a 1048 carb . Mount 5" rails and get the gizmo mounts , 1/4 shunner cable , and speedmaster hardware then your home free.

i already did ditch the engine because it wouldn't start. i'm not going to get a zenoah any time soon because i'm already working on a progect with a large gas engine and pneumatic engines are fun because you can make them sound like a gaser, they can be made to go very fast, and i need something that requires some machining so that i finally set up my metal lathe.

Originally Posted by Kcal

Looks pretty good, just needs a ball for the servo linkage and maybe some real thick grease to keep it air tight. It probably uses a ball and not a rod for the valve and the spring on the bottom could also be tightened or loosened to tune it if needed.

ok, never seen one of those but that sounds like it'll work great. what kind of grease do you recommend? i can not find telescopic tubing! if anyone sees any at a hobby shop or something please tell me the place's phone number or sight so that i can order some.

i don't know if i've posted this before but here's where i'm getting my ideas for the engine: http://home.ctlnet.com/~robotguy67/c...ir_engines.htm it's hard to get large diameter telescopic tubing (i found some! don't know what the tolerances are though) so the engine's going to have to be at least a V8 to get a lot of power. in the link the first engine only has 5 7/16" cylinders and it's swinging a 18" three blade prop, might be doing this wrong but i think that that means it's able to get close to the power of 25cc gas @ >10cc

ok i'm confused now. i've finally found the homlite with a clutch for $10 and close by. i have not yet gotten any of the parts to make the boat run on air so i always can change my mind. the idea of running a high rpm V8 is cool but it will definitely cost more then $10. what to do?

never mind it doesn't look like the one on page two. here it is http://westernmass.craigslist.org/grq/3398351671.html

i found all of the pipe i will ever need! http://www.componentsupplycompany.co...tubing-sw.html looks like it'll be close to $100 worth of parts to build the engine . i should have gotten the pipe i had seen at the tagsale and just tried it!

few my math was wrong, it's not that bad.$60 for an engine is good! i still need to be able to machine the crankshaft though. here's a kind of funny example of the power of air: http://www.google.com/imgres?q=air+p...r:24,s:0,i:163

i put some finish on my boat and it looks so awesome! i've got to get a pic to show you guys!

i got a couple cents off a house that i was striping the siding off of and i think if i use some pieces of them it'll make the boat look better. I'm not getting much time to work on the boat right now because i have a hard trimester at school. hopefully it'll get easier/i'll get less homework soon, hopefully, hopefully, hopefully

finally a pic! i still need to put some finish on the bottem though, i couldn't flip the boat over when the top was still wet

Shes looking good!

thanks! I'm loosing interest in it again though