Prop Shaft

[gn7]

Some what rotational mass, but they could always skirt much of that with a rifled drilled 1 or 1 1/8 shaft and actually be stronger.
Its the drag/lift of the larger shaft, including the larger strut. Not all of the teams use them, but bet your ass the top ones are. Its not a matter of some low "stock" HP thing. Just the expense and hassle of finding and /or having made 7/8 RH props makes it an overly expansive proposition.

Then you look at the size of the collection of props in Rankins trailer and the reality of it slams home. Knowing that each one of them has an extremely short life span makes it even more daunting.

I don't know how much shorter life the shaft is over a 1" shaft. They see less than 700 HP. How much worse is that than some heavy ass GNs kicking out 1000+ in rough water. And there a couple running 1" shafts with reasonable success.

But the cost of relatively short lived 7/8th props just scrub some lift and drag seems a little over the top. But I have talked to guys that have switched from 1" to 1 1/8 shafts in a heavy v bottom, and they swear they can tell the difference. So in a little flattie, who knows the real effect.

[Propless]

Some what rotational mass, but they could always skirt much of that with a rifled drilled 1 or 1 1/8 shaft and actually be stronger.
Its the drag/lift of the larger shaft, including the larger strut. Not all of the teams use them, but bet your ass the top ones are. Its not a matter of some low "stock" HP thing. Just the expense and hassle of finding and /or having made 7/8 RH props makes it an overly expansive proposition.

Then you look at the size of the collection of props in Rankins trailer and the reality of it slams home. Knowing that each one of them has an extremely short life span makes it even more daunting.

I don't know how much shorter life the shaft is over a 1" shaft. They see less than 700 HP. How much worse is that than some heavy ass GNs kicking out 1000+ in rough water. And there a couple running 1" shafts with reasonable success.

But the cost of relatively short lived 7/8th props just scrub some lift and drag seems a little over the top. But I have talked to guys that have switched from 1" to 1 1/8 shafts in a heavy v bottom, and they swear they can tell the difference. So in a little flattie, who knows the real effect.

Bob, have you ever seen or heard of a shaft like mine, 7/8" shaft but uses a 1" prop ? Looks like a 1" shaft that's been turned down to 7/8" from the props taper forward.

[Propless]

Do you have a pic of that?

Its the best I can do with my phone.

[gn7]

Do you have a pic of that?

Yeah I've seen them. I believe the use of 7/8 shafts may have started that way and evolved to include the prop itself, of for no other reason than prop availability. I imagine the grinding of the shaft was a pricey affair as well, but did make the prop hunt a little easier, and a little easier to dump unwanted/unused props.

[ogshotgun]

Yeah I've seen them. I believe the use of 7/8 shafts may have started that way and evolved to include the prop itself, of for no other reason than prop availability. I imagine the grinding of the shaft was a pricey affair as well, but did make the prop hunt a little easier, and a little easier to dump unwanted/unused props.

i called my go to guy and showed him the picture you posted he said they tried that years ago to reduce rotating weight and easier to find props .. i asked how did it work out , he laughed and said i crashed the boat couldn't tell you.. lol

[Propless]

i called my go to guy and showed him the picture you posted he said they tried that years ago to reduce rotating weight and easier to find props .. i asked how did it work out , he laughed and said i crashed the boat couldn't tell you.. lol

This probably the stuff from that boat. Story is these parts came from the SS 44 boat that flipped at Long Beach in 07.

[ogshotgun]

This probably the stuff from that boat. Story is these parts came from the SS 44 boat that flipped at Long Beach in 07.

ill check into that lol

[Propless]

Ok, and for the big question.

Should I even consider staying with that shaft in a lake use boat ? Assuming it checks out good. Or just go through the work to step up to a 1" shaft now before the strut goes back in. Changing to a 1" would require a new (or modifying) the coupler, and possibly a new strut (I haven't measured the strut barrel yet to see if a 1" bushing will fit). I could see that shaft being very expensive to duplicate if anything ever happens to it in the future.

I don't plan on running the blower anymore so hp should be around 600, and the boat is fairly light (small stringer) Daytona flat.