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Cadillac 500 DD Prop

Southern Airboat Gallery Archives

2011-11-29_17_08_35
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somedumbredneck

Well-known member
Trying to narrow down what would be the best Prop fo my boat.
15ft Alumitec with Stainless rigging and a 500 Cad.
Alum intake Holley 600 with 1in spacer running a 72 X 32 Wood paddle, can spin it 3100. I keep it at 2950 but i can get 3100. I have alway had AC motors, this is my first CarBoat. I like it, a lot different ride.
I have always liked the WarpDrive on AC.
Any Help and input would be great
 
t-rex posted a sensenich prop for sale that would do well for a dd caddy.there will probably be no best prop cause they will all react different to youre boat and rig combo.
 
Red Dwarf":3ve47awe said:
It's the Warp Drive in the classifieds on this site
Click to expand...
ya i would like to have that prop,, onley im worried about the 70in over length.. i think i need it 72, thats why im posting to this site.
 
On his 470 it works great as a 5 blade and he has a strong running 470. His boat will go anywhere he points it.

You might run it as a 6 blade, but it would probably still work fine as a 5 blade on your 500.

You should let him know, he had it off the boat waiting on you this week.

Red
 
Just for comparisons, we delivered our 455 Buicks with 70-42 & 70-44 fixed pitch props. The 455 is a 365 HP machine with 500# of torque right out of the auto. With a few simple mods ya had to be careful cause 3150 RPM was way easy !

Just for thought, nothing else. Sure not trying to sell anything.

Scotty
 
I always ran a 72 X 38 wood paddle with a direct drive Caddy. Adjustable composites are the way to go but you have to be very careful with harmonics with the 500. A balanced rotating assembly and an aftermarket damper is what I suggest when running composites on a direct drive application.
 
I also ran a 72x38 paddle prop on my CAD boat years ago. The motor was a stock '70 500 w/10:1 compression. It'd turn about 2850 rpm's.
 
Hey guy's what would be the equal of a 72x38 but in a none paddle prop just setting a goal for my DD LS1 I figure if I can swing the same prop as a DD caddy with less weight it should run fair!
 
SomeDumbRedneck - Just wondering...is your boat a Witfoth build? Hope you decide to splash it and join us on Saturday.
 
I run a 74" whirlwind stump puller prop. If you are turning a 72x32 at 3100 then you may have other issues. I ran a 72 x 38 paddle at 3000 wot. Mine is stock with a 1" spacer and a 600 carb. As someone else stated there is no "best" prop. I run mine on a 15 x 7 aluminum boat and it works great. My dad has a 16x8 old fiberglass with a 455 olds and a 74" sensenich q series 2-blade that works awsome as well.

Dan
 
One thing to remember is that no two wooden propellers are the same. I can put two 74x 34 paddles props side by side, bolt them up back to back and get very different performance. So keep that in mind. I ran the 74-34 paddle for years on a heavy boat with a DD Cadillac with a very good Reed Cam designed for the low end. Charles
 
Thunder, a buddy of mine used to swing a 70x50 narrow blade sensenich wood prop about 3300 rpm with a stock 10:1 caddy. He came up with that size after runing about 10 different length and pitch props and that one gave him exactly what he wanted with snap and push. The old days before composites were kind of a crap shoot with prop sizes, and you hoped you got lucky.

Larry
 
I ran several props on my DD cad 500. A 72x32 stick-way too little prop was a dog, 76x34 paddle- ran ok, 78x32 paddle ran ok, 80x33 paddle - pushed pretty hard, 5 blade at 10 degrees 3000+rpm, ran alot better than wood, 6 blade at 8 degrees 3100 rpm, this was by far the best prop, ran circles around any wood prop I ran, but the cads have a big harmonics problem with the ward drive they need some type of dampener. In 3 yrs went through 3 wood props, also the large paddle props are alot of rotating weight. The warp drive seemed to be a good combination, strong push and alot of snap, also saw improved fuel consumption with the warp drive.
 
sre":1bprs9p5 said:
I ran several props on my DD cad 500. A 72x32 stick-way too little prop was a dog, 76x34 paddle- ran ok, 78x32 paddle ran ok, 80x33 paddle - pushed pretty hard, 5 blade at 10 degrees 3000+rpm, ran alot better than wood, 6 blade at 8 degrees 3100 rpm, this was by far the best prop, ran circles around any wood prop I ran, but the cads have a big harmonics problem with the ward drive they need some type of dampener. In 3 yrs went through 3 wood props, also the large paddle props are alot of rotating weight. The warp drive seemed to be a good combination, strong push and alot of snap, also saw improved fuel consumption with the warp drive.
Click to expand...
Where do you find the ballancer. and how did you fix the harmonics problem. i have a crank pully on my motor seems to weight 6-8 lbs.. is this what you are talking about
 
I wish there were someone that has tried a Whirlwind or Sensenich 2 Blade and 3 Blade on the same boat? Is the extra blade worth $550.00, Advantages with harmonics and such? Is a 70" 6 Blade big enough for a Caddy, or BBC?
 
Hi COLD-EH',

As you can tell by the posts about props a lot is personal preference I think. As for the 70" 6 blade on caddy or BBC it would definately work...probably not the "best" choice, but you wouldn't be wasteing your money, as it would still be a good backup prop if and when you made the final decision. Plus you could probaly get your money back if you sold it.

Grant
 
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