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Spinner choice ?

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DaveyP25/07/2018 09:35:49
206 forum posts
47 photos

Hi all,

I have an old OS max 25 in a trainer I've just finished and would like to fit a spinner, but what size would I need ?

Spinner suppliers don't seem to quote the hole diameter for the shaft, any clues anyone.....

Tia, Davey

simon barr25/07/2018 10:28:54
1033 forum posts
16 photos

You don't buy a spinner by the size of the hole in the centre, you buy one to fit nicely over the front of the cowl.

You just have to drill out the centre hole to fit over your engine prop shaft.

Edited By simon barr on 25/07/2018 10:29:13

Edited By simon barr on 25/07/2018 10:29:42

Geoff Sleath25/07/2018 10:31:05
3355 forum posts
272 photos

It's quite normal to drill out a spinner backplate (or propeller for that matter) to suit the engine or motor shaft size.


Bob Cotsford25/07/2018 10:36:13
7963 forum posts
439 photos

If you buy an aluminium spinner they usually come with one or two sleeves so they can fit different size engine shafts, but make sure you get the right adaptor nut to suit your engine. They're 30gm or so heavier than a plastic spinner so help if nose weight is needed, but being hard aluminium it can be a pain adjusting the prop cutouts to fit if you don't have the right tools.

It's all swings and roundabouts, easy to trim plastic spinners that soon look scruffy or nice shiny ali that's less user friendly to fit.

Chris Walby25/07/2018 13:32:59
980 forum posts
230 photos

I tend to find plastic spinners suffer from prop creep on IC models so go for ali ones instead.

PS I have had a couple of spinners where the hole is larger than the engine problem if you have a lathe and best resolved with something nice and true to maintain balance.

PPS over time you end up with a bag of assorted spinner where one will fit wink

Peter Miller25/07/2018 14:21:24
10156 forum posts
1192 photos
10 articles

Look on Ebay. Dubro and Great Plane spinners come with a whole series of plastic rings to adapt the spinner.

You OS Max 25 will have a 1/4" shaft so most spinners between 2 and 2 3/4" spinners will fit straight away without adaptors.

Edited By Peter Miller on 25/07/2018 14:22:46

DaveyP26/07/2018 12:31:18
206 forum posts
47 photos

Thanks for the replies, I wasn't sure about drilling the backplate of a spinner, but if that is standard practice that's what I'll do if needed.

Just about to order a 2.5" spinner from Slec nerd

Gordon Whitehead 126/07/2018 16:32:08
320 forum posts
120 photos

You might make a better job of keeping the spinner backplate hole central if you use a propeller reamer.


Percy Verance26/07/2018 17:19:56
8108 forum posts
155 photos

And if you use a Great Planes reamer, then that's even better because they're stepped not tapered.......

DaveyP26/07/2018 18:29:08
206 forum posts
47 photos

Getting a bit technical now............dont know

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