Thread: prop bending 101
03-18-2007, 05:57 PM #1
prop bending 101
This is how I do it. Surely there are better ways and room for improvement but I wanted to share what I have.
I use an old Reese reciever with a 3/4 hole, scrap 1/2" aluminum plate, Solas prop tool, 3/4" -6 1/2" bolt with nut and a 24" cresent wrench. The bolt must be 3/4" to keep everything from having any movement. I also like the 24" cresent because it gets all the way to the root.
03-18-2007, 06:22 PM #2
Using the plate allows you to set the prop gauge down as you are bending. This saves a great amount of time back and forth doing each blade. The Solas removal tool keeps the prop from moving while you apply pressure downward. If it still moves you can hold it with a wrench on top.
I was able to bend a stock DF 14-20 ( really 13-19) to 24 degrees like it was butter. The entire process only took about 10 minutes for all three blades!
Also try to keep the transitional curve as smooth as possible. Mark each blade the same amount up or down that you want for your desired pitch. Some only picth the trailing edge 1" while others go as far as 2 1/2". Only use the bottom of the impeller as you guide with the gauge, this is the thrust side of the blade and it tapers from top to bottom over a degree as it reaches the tip.
Last edited by Hydrotoys; 03-19-2007 at 02:44 PM. Reason: Pic removed per owner
03-18-2007, 06:24 PM #3
03-18-2007, 06:36 PM #4
I made a plate from scraps for my winch that looks like that. It's 2" box stock with a 1/4" plate welded to it.
I was going to make another one for a 5" vise but now I'll leave room for a prop, Thanx
03-18-2007, 09:17 PM #5
03-18-2007, 10:13 PM #6
(Some only picth the trailing edge 1" while others go as far as 2 1/2".)
Cool post Duke...Is the end result any different if the bend stops at 1 inch or goes to 2.5 inches up? This looks like what kawasaki calls a variable pitch impeller. My stxr stock impeller is listed as a variable and tails down the last inch just like the one you are showing after you bent it.
03-18-2007, 10:56 PM #7
- Join Date
- Nov 2006
Where did you get the prop gauge?
03-19-2007, 04:17 AM #8
03-19-2007, 07:34 AM #9
Variable pitch refers to the leading edge being different then the trailing. I believe most are variable pitch these days.
03-19-2007, 07:36 AM #10
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