ericrw Posted October 23, 2016 Share Posted October 23, 2016 Though I have a Prop balancer it is only suitable for a 2 bladed prop. I need to know if there is away of balancing a 4 bladed prop. Quote Link to comment Share on other sites More sharing options...
Biggles' Elder Brother - Moderator Posted October 23, 2016 Share Posted October 23, 2016 Why is it only suitable for a two bladed prop Eric? It will work with 4 blades just the same. Basically put your prop on, in an unbalanced state one blade will be heavier - it will tend to swing to the bottom. Lighten that blade, try again. You do this until no blade shows a clear tendancy to be the "bottom blade". BEB Quote Link to comment Share on other sites More sharing options...
ericrw Posted October 23, 2016 Author Share Posted October 23, 2016 The prop I`m trying to balance is a FMS 4 bladed prop and the prop centre disc measures 4", which cannot be used with my present Balancer. It is the only 4 blader I have and I do not expect to go in that direction again. I know that a Du-Bro would allow this but I was hoping that someone out there may have a DIY answer to my problem. Quote Link to comment Share on other sites More sharing options...
Biggles' Elder Brother - Moderator Posted October 23, 2016 Share Posted October 23, 2016 Ah - you mean it just isn't big enough - not that it can only do two-blade props? Yeap - OK no problem. Just use a suitable shaft to hold the prop on its disc - when I did this for what might very well be the same prop (the FMS 1450mm Mustang) I just used a piece of steel bar I had lying around in the workshop. Take two wooden blocks high, enough to support the prop clear from the ground - so about 8-9" tall. Set a standard razor blade in the end face of each. Level the blades of the razors using a spirit level and some shimms under the blocks, then just rest the shaft on the blades and you're away. BEB PS For the FMS prop I actually found it easier to add a little CA to the central hub opposite the heavy blade - rather than lighten the heavy blade. This worked well. Edited By Biggles' Elder Brother - Moderator on 23/10/2016 19:54:03 Edited By Biggles' Elder Brother - Moderator on 23/10/2016 19:56:49 Quote Link to comment Share on other sites More sharing options...
Former Member Posted October 23, 2016 Share Posted October 23, 2016 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
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