never mind i found it. It needs 2 quarts of synthetic auto tranny oil, and those lugs are for draining
http://www.centurydrives.com/PDF/CR_Ins ... Shafts.pdf

Did some hunting and i found the research. It's quite interesting to read. One of the quoted texts says that a ducted prop can produce twice as much static thrust...
http://docslide.us/documents/drag-reduc ... motor.html
skip to page 37 for the start of the ducted research.

Definitely worth trying some scale experiments. Im super interested. I do powered paramotoring, and have read some scale thesis on ducting the prop. ill see if i can find it

Or i think i read somewhere they actually have oil in them that needs draining?? Do you use those plugs to drain and refill the oil? and if so, can anyone tell me what type of oil i should be using?
cheers again!

Just trying to figure out a few things on my new airboat I have the counter-rotating props on my gto boat with a 502. Label says to grease the lower bearing and 2 upper bearings. as far as i can see, there is only one grease nipple on the lower bearing and no nipples on the top 2. Probably a silly q...

Ive just ordered this kit, http://pertronix.shptron.com/p/d8001-gm ... it-red-cap
so hopefully replacing the bits and pieces and checking the spark gap will do the trick

thanks for the ideas guys,
its a HEI dizzy
ill check out what sort of module it is and try those solutions thanks very much!

can the dizzy/ignition advance cause overheating issues?

Hey guys! i sold my 17' stainless and bought a 2012 gto 21':) http://i533.photobucket.com/albums/ee337/codeatoll/IMG_20160221_213214_zps0pfhlqjm.jpg Had a one good run but now having issues after it has been running for 15 mins or so, and was wondering if anyone else had had similar issues. its got ...

Ive not put in 7 washers on each side which has helped alot. Ill see about flattening out the hull now thanks for the "jack" advice!

Shouldn't it be "you're talking now? Not "your talking now" haha
Anyway, thanks for the hint lox!

Just wondering if anyone can tell me the top speed of thier 17x7 with around ?450hp.
Mine has 3 blade water walker prop, seems to do around 40mph but has heaps of bow spray at the moment which i am trying to remedy.

I replaced all the engine mount bolts with stainless bolts and raised the back of the engine with 4 washers. Still heaps of bow spray...

I guess i need to go more washers??

The hull has a bunch of depressions not sure if this can completely prevent the hull from planing properly?

Looks like the engine is a 502 has 8.2 stamped on the block
and a ch3 2-1 reduction drive, which has a 400hp max stamped on it:/

wouldnt a stock 502 be more than 400hp anyway?

Im on the gold coast in benowa

Blackdawg your rig looks amazing!

Thanks so much for the info guys, ill give the hull a good inspection and see what I can see.
Its good to know that bow spray is not something I have to put up with haha

Hey thats great info, the guy I bought it off said this airboat was built for a mining company in western australia, it still has the company name and logos on the rudders! Yes it is definitely stainless steel, so its one of only a few that were made with stainless then? Is it rare to have one made ...

Thanks for the reposnes guy, Deano especially. I did some searching and i now i do have a dent in the front of the hull which sounds like it would be called a 'hook' in airboat land
I'll sort out the dent, and see what happens, and then move on to adjusting the engine angle.

CHeers!

Just bought an airboat and we are getting drenched haha

how can i cut down on the bow spray?

will a bow extension fix the problem and does anyone know where they are available? Are some designs better than others?

thanks in advance

Im in Australia, and ive been looking for 6 months for an airboat to come up for sale! THey are extremely rare here. Anyway so i bought this one sight-unseen. I know its a 17' GTO Airboat, but i dont know what year or exact engine model. It is all stainless steel, even the skin on the hull, so i bel...