jeffw@sc47
Well Known Member
Been prepping the 13" Cummins aluminum spinner for a few days now. <cumminspinners.com>
The spinner and kit are a work of art and very solid, his front plate is a little thicker than the one supplied by Van's for their spinner. The instructions on-line are very good with the exception of one adjustment I'll point out.
In his video he says to lay out six equal spaces on each half side of the spinner for the backplate screws and between each screw location the measurement should be around 3-33/64". But, when the distance between the first and last of the 7 holes (to the backplate screws adjacent to each prop cutout) is divided into 6 equal spaces (7 screw holes, he provided 14 nut plates for the backplate mounting holes), the holes are about 2-21/32" apart. Minor hiccup, but cause for a bit of head scratching. I went with 7 screws each side, 6 equal spaces.
I pilot drilled all of the front and backplate holes in the spinner following the instructions on the video - that worked fine. I did create the layout sheet he describes in his video on a CAD file which may be a little more precise, and plotted it full size.
I mounted the backplate to the prop hub and the front plate to the front of the prop hub, and then the whole prop assembly back on the engine and temporarily cleco clamped the spinner to the to the backplate. I removed a spark plug from each cylinder so I could turn the prop and not have the engine jiggling around so that I could track the spinner nose to get it aligned. Don't want to have a wobbling spinner. The spinner point was not tracking on-center by about 3/32".
Was very careful to make sure that anything that shouldn't be moving to cause this was as stable as possible. Had a friend slowly turn the prop so I could look at the spinner close-up in relation to a stationary pointer on a solid bench. Spent most of morning playing with it. I took the spinner frontplate off and found that the center hole and the four front plate attach holes (1/4") were off-center along one of the axes by about 1/16" to 0.10", translating to the approx 3/32" wobble at the nose of the spinner.
dims shown are distance from outer backplate circumference to outside edge of the 1/4" mounting holes, one is 2.88", the other 2.95" +/-
Sent Alan an email (in Austrailia so not very accessible via phone) requesting that he send me a replacement frontplate, pre-drilled or not drilled. So now waiting for reply or a replacement spinner frontplate.
The spinner and kit are a work of art and very solid, his front plate is a little thicker than the one supplied by Van's for their spinner. The instructions on-line are very good with the exception of one adjustment I'll point out.
In his video he says to lay out six equal spaces on each half side of the spinner for the backplate screws and between each screw location the measurement should be around 3-33/64". But, when the distance between the first and last of the 7 holes (to the backplate screws adjacent to each prop cutout) is divided into 6 equal spaces (7 screw holes, he provided 14 nut plates for the backplate mounting holes), the holes are about 2-21/32" apart. Minor hiccup, but cause for a bit of head scratching. I went with 7 screws each side, 6 equal spaces.
I pilot drilled all of the front and backplate holes in the spinner following the instructions on the video - that worked fine. I did create the layout sheet he describes in his video on a CAD file which may be a little more precise, and plotted it full size.
I mounted the backplate to the prop hub and the front plate to the front of the prop hub, and then the whole prop assembly back on the engine and temporarily cleco clamped the spinner to the to the backplate. I removed a spark plug from each cylinder so I could turn the prop and not have the engine jiggling around so that I could track the spinner nose to get it aligned. Don't want to have a wobbling spinner. The spinner point was not tracking on-center by about 3/32".
Was very careful to make sure that anything that shouldn't be moving to cause this was as stable as possible. Had a friend slowly turn the prop so I could look at the spinner close-up in relation to a stationary pointer on a solid bench. Spent most of morning playing with it. I took the spinner frontplate off and found that the center hole and the four front plate attach holes (1/4") were off-center along one of the axes by about 1/16" to 0.10", translating to the approx 3/32" wobble at the nose of the spinner.
dims shown are distance from outer backplate circumference to outside edge of the 1/4" mounting holes, one is 2.88", the other 2.95" +/-
Sent Alan an email (in Austrailia so not very accessible via phone) requesting that he send me a replacement frontplate, pre-drilled or not drilled. So now waiting for reply or a replacement spinner frontplate.
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