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[Trucker]

Hi, all
is it advisable to manually file down with care a pair 4 blade korts props, im asking because im about to order a pair for my scratch built kortze nozzel from prop shop, if i order their 1.6 inch they will be too tight, if i drop down to 1.5 inch whilst untouched will appear to look too small...


Trucker

[Andyn]

It’ll be fine


To sharpen and balance race props (Prop Shop props included) I use a file, among other tools. The important bit will be balancing them afterwards so you don’t end up with shaft vibrations wearing your shaft bushings prematurely

[Trucker]

Hi, Andyn
Thanks for replying so quickly, so, how do i balance the props, nearest to that skill ive got to is balancing helicopter blades


Trucker

[Andyn]

I use a magnetic balancer, which is a length of rod suspended between two magnets in a frame. To balance, you fit the prop on the hub, drop it between the magnets and gently spin it. The heaviest prop blade will always stop at the bottom.


This is roughly what I have, is a much cheaper version but would get the job done:
https://www.ebay.co.uk/itm/183797339493?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=X7JBkMeQRhi&sssrc=2349624&ssuid=Fdryb-p3QzW&var=&widget_ver=artemis&media=COPY


Oh the days when heli blades had to be balanced!

[Ralph]

Guessing that your props wont have a mounting hole all the way through, but a blind threaded hole?


If that's the case, set up 2 razor blades, stanley knife blades or something similar parallel, dead level and and a couple of inches apart (blue tack'll be enough to hold them in place).  Mount your prop on a spare shaft and sit it on the blades - with the minimal friction between the blades and the shaft it'll roll along until the heaviest prop blade is at the bottom.  Maybe not as precise as a magnetic balancer but there again you'll only be running at a fraction of the rpms a racing prop does.


Ralph

[Trucker]

After sending my reply i went on youtube and watched a couple of vids on the subject , so guessing some filing is coming my way, hey thanks for the help, another skill to learn 


Trucker

[Trucker]

Ralph
Thanks for the tip regarding a blind threaded hole, didnt think about that 


Trucker

[Andyn]

Must admit, I’ve done hundreds of dog drive props with through holes and had forgotten slow boat props have blind holes and threads

[ray123]

your best bet  would have been to talk to simon at prop shop and tell him the exact  size you needed  he would turn them down  for you


 ive had simon do this a few times now [size=78%] [/size]