Thread:

Prop Design Variables

Originally Posted by Factory1

Ray keep sitting on the sidelines with your pom poms and put a sock in it!

Todd, I know your used to being everyones punching bag and laughingstock but my WAIT FOR IT does not pertain to you
so dont get all chest out on me.... go polish that pile of puke you call a boat

Thanks for the post Craig!! Looks like the leading edge of the "runner bottom props" have a larger gap also.. More rake maybe??

[QUOTE=stix818;1661673]Thanks for the post Craig!! Looks like the leading edge of the "runner bottom props" have a larger gap also.. More rake maybe??[/QUOTE

Vince, I agree the Grose props drive great ! I had one on my
Hondo with the old motor for a couple passes it left so nice
then would hook up and pull hard. My other prop left hard but would kinda flatten
Out quick . I think the Grose prop I ran was like 10 7/8.

Originally Posted by 61 Sanger Ski Hydro

This seems counter-intuitive. More power will not carry the nose? Is the trick here that more power will cause more prop lift, thus pushing the back of the boat up and the nose down on the rocker? So, moving the prop forward changes the center of balance with more weight behind the prop to counter the lift. Would moving the engine back do the same thing as moving the strut forward?

I'm going to say yes.. If you look at some old open TAF's the strut is around 28 to 29 inches vs 27 or so.. Jim worked on the bottom of my boat and moved the strut over an inch for our combination.. I only have one race on it but it ran it's best it's ever ran at Phoenix.. As for moving the motor back, it does in a way but the strut being moved 1" is HUGE over moving the motor back 1".. Not even close in comparison!!! Jim had to explain this a little bit to me because we were going to move the motor back 1" this off season but since I'm going to an all aluminum deal he said to leave it where it's at due to the 200lb diet..

Ray, I completely agree!! My Menkins was man handling me and making it difficult to drive at the hit.. Joey's props are bad ass and it allows me to actually drive the boat more rather than just hold on!!!

i have three props for my cloe tr2, ive ran the top one (10 7/8 x 15 carry)the most it seems to be the one it liked best . i ran 22s pulling 6800 at 107, it would pull from out of the hole violently hard on the launch all the way out the back, never flat lining. the prop in the middle (11 1/2 x 15 carry) i tried with 15% it would burn prettty hard on he launch and flat line at about half to three quarter track and felt slower. the prop on the bottom, have not tried yet 10 5/8 x 15 unknown manufacture. have some pics, would like to hear some thoughts on them.

top to bottom; (#1) 10 7/8 x 15 carry, (#2) 11 1/2 x 15 carry, (#3) 10 5/8 x 15 unknown

Originally Posted by Hi Tech Marine

Hold on a minute!!!! When did someone decide that a prop with the blades farther forward was strickly called a "Runner Bottom" prop, and vice versa?? Years ago prop mfg's like Menkens and Precision started moving the blades further forward to compensate for the strut being TOO FAR BACK! That's how the evolution of flatbottom props came to varietiies we have today. The original props that lead the way where Cary's and Stellings. Most of the Cary's worked good (for what they where) out of the box and the Stelling's usually required some tweeking, but where very popular on the normally asperated boats. Bob Hewitt Sr. was always experimenting with props and early on discovered that cutting the diameter down was key. He had an arsinal of props that was unbelievable. The Cary thick blade props where the ONLY prop that would not imediatly fold and ear at the hit on a BFF or BAF. The evolution of different configurations started a long time ago. We never labled ANY one style to be designed strictly for a runner bottom or flat bottom. Hell... there was even some props that where being re ground in Texas that where semi cleavers! (Chester Montgomery) So to sum it up..... when it comes to dialing in your Runner bottom or Flatbottom, you want to put a prop on that gives you the lift you need... WHERE you need it. And forget all this BS about wheather it is designed for a runner bottom or a flat. NOT ALL STRUTS ARE IN THE RIGHT PLACE FOR THE POWER YOU PRESENTLY HAVE! The more power you make... the farther forward the prop needs to be to carry the bow 1320. If not, it falls in and goes to sleep. That's the #1 reason most flats don't accelerate the last 660'. That's my .02

I’m sorry Dan I guess I should clarify. There is certainly no official flat bottom prop or runner bottom prop as you have pointed out, and the extent of variables can be endless. The back ground here is this. I herd someone describe propellers in terms of ones that were favorable to the true flat and ones that favorable to a runner. I “loved” the terminology because it made it easier for me to remember characteristics and distinguish between propellers. I’m not trying to bull shit anyone. If you are familiar with your combination, and if you know what characteristics you are looking for, why not narrow the field some.

Originally Posted by 1bdhondo

Wait for it ........wait for it ......... Wait for ittttt.........

Originally Posted by 1bdhondo

Very interesting thread, Pretty cool discussion. I have nothing to add
Except wait for ......... Wait for it ...... It's coming !

Well..... we're waiting

Originally Posted by Cole Man II

I’m sorry Dan I guess I should clarify. There is certainly no official flat bottom prop or runner bottom prop as you have pointed out, and the extent of variables can be endless. The back ground here is this. I herd someone describe propellers in terms of ones that were favorable to the true flat and ones that favorable to a runner. I “loved” the terminology because it made it easier for me to remember characteristics and distinguish between propellers. Nothing more to it than that..

So when did Jim change his name to Dan? I feel so left out....

And I have nothing to add to this thread except thanks to those that know this stuff taking the time to post.

I'll have to pull my Menkins out and check it.. When I put this boat together in 03 Wayne sold me a Menkins.. Wonder if it's the same one.. I actually liked the Menkins.. I've tried a couple of my oldman's props that are collecting dust and my Menkins out ran them.. I'll try and pull my Grose off and take some pictures and compare them to yours..

I have a PM over at v-driveboats from GFinishline and he was talking about Menkens out of Az that puts more cup into the blade towards the edge to get a "smaller" cone behind them.. I found it pretty interesting what he was talking about, any thoughts?