Prop Shaft

[ogshotgun]

GN 369 lost an A 22 shaft and new prop in Sat. race at Parker. I was told it had 6 races on it. I wouldn't run an A 22 prop shaft if was free. K Monel from Italy will be my shaft of choice from now on.

my friend snapped a kmonel 500 shaft from glenwood marine in 15 minutes of run time...its not the material thats the problem its the machine process thats causing the failures
Problem Child TFH uses aqua met 22 and there about 9000 hp and 265 plus mph, no broken shafts there

[gn7]

my friend snapped a kmonel 500 shaft from glenwood marine in 15 minutes of run time...its not the material thats the problem its the machine process thats causing the failures
Problem Child TFH uses aqua met 22 and there about 9000 hp and 265 plus mph, no broken shafts there

You CANNOT compare a TFH shaft setup to the average flat bottom shaft. Its like comparing the tires on Forces funny to your street tires. For starters, they use two piece prop shafts, and dispose of the rear section after X number of runs. Some of them don't have keyed props either.

[ogshotgun]

You CANNOT compare a TFH shaft setup to the average flat bottom shaft. Its like comparing the tires on Forces funny to your street tires. For starters, they use two piece prop shafts, and dispose of the rear section after X number of runs. Some of them don't have keyed props either.

john force runs 33" tall slicks with a 18.5" foot print ... my street car i run 31" tall slicks with a 14" contact path ,, pretty close , but aim saying is the guy that commented that he wouldn't take one if it was free.. he would buy the KMONEL 500 for 1500 bucks i guess his boat uses a shaft thats 187.50 inches long because kmonel is 8.00 a inch about, i was making a point that its not the material its the machine work where they fail usually , was using the TFH as a example .. he claims Aquamet is shit.. but it will take a 9000 hp motor and survive..he ran a Kmonel 500 in TFH and it broke out of the hole

, and also he had a shaft that used by a racer that claimed 6 races on it and he broke it.. well the racer sold it for a reason

[ogshotgun]

You CANNOT compare a TFH shaft setup to the average flat bottom shaft. Its like comparing the tires on Forces funny to your street tires. For starters, they use two piece prop shafts, and dispose of the rear section after X number of runs. Some of them don't have keyed props either.

just checked the life of a shaft in a TFH according to the Team owner both prop shafts last a whole season unless a mechanical failure by other parts causes problems

[gn7]

Did you ask him if they look like this?
And the if the shafts are 2 pieces?
Things have changed a little since going to the dual props, but I don't know if I would trust any rear shaft for an entire season.

MAYBE if it was keyless. MAYBE

[ogshotgun]

Did you ask him if they look like this?
And the if the shafts are 2 pieces?
Things have changed a little since going to the dual props, but I don't know if I would trust any rear shaft for an entire season.

MAYBE if it was keyless.

from what i seen is the shaft has splines on one end going direct into a coupler on the W drive and the prop end is just a taper , but they do use a huge impact to torque the prop nut to 250 plus pounds and there is no keyway

[gn7]

When you think about it, how far does the shaft have to move the boat. How many revolutions does it even spin. A top fuel dragster spins less 550 times light to light IN A 1/4 MILE!! The stuff is under a tremendous strain, but not for very long.

A full season of drag racing won't get a full lap at the Parker enduro

[ogshotgun]

When you think about it, how far does the shaft have to move the boat. How many revolutions does it even spin. A top fuel dragster spins less 550 times light to light IN A 1/4 MILE!! The stuff is under a tremendous strain, but not for very long.

A full season of drag racing won't get a full lap at the Parker enduro

your right about that ...
than again the very best of the best manufactures run all types of endurance racing , parts fail thats all there is, most material fails are machining and over stressed..

[gn7]

X'2... Plus a drag boat isn't constantly coming out of the water at WOT releasing the torsion and hammering the shaft when it makes contact with the water again.

Just the hull lifting and falling, and heavy chop, without the boat coming out of the water will vary the load on the shaft

[ogshotgun]

Did you ask him if they look like this?
And the if the shafts are 2 pieces?
Things have changed a little since going to the dual props, but I don't know if I would trust any rear shaft for an entire season.

MAYBE if it was keyless.

i don't know what you call the one in the picture but thats definitely the way to go i believe