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Advice needed on installing a 4st where a 2 st used to be ?

Anti -vibration needed or not ?

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Myron Beaumont19/06/2009 11:08:07
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5797 forum posts
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For the fourth time I'm putting another engine in my home design 'very lightly built "gangster " type model 60 inch span. .The engines used so far have been a Super tigre 60 ,an Irvine 53 ,an SC 91A (far too powerful) & now have a lovely OS 52  4st to fit .  The original engine mount has been on an aluminium plate screwed to the front of hardwood bearers extending from nose to wing TE ( good and solid) .Having had the SC in situ I had to cut the aluminium out too big for my OS . I have made a steel copy  with the necessary  gap for the crankcase . The question is Should I sandwich rubber/ sponge between the two metals & if so How thick -What type ? or just mount the steel firmly to the ali.? I seem to remember reading somewhere that it's not a good thing for the engine to be wobbling as it does the internals no good .
Would appreciate practical guidance please .I reckon the OS will be just perfect -even C of G wise as my servos are all as far rearward as they will go.after the SC91 fitting. No matter what I do I am ready to reshape the front end so that my spinner blends in with the slight increase in height  of the new configuration
Myron
00119/06/2009 11:37:28
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Myron, if you have had  the other larger engines fitted with no difficulty, vibration fron the OS (what little there is) should be no problem..
Myron Beaumont19/06/2009 11:40:22
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5797 forum posts
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Thanks Richard .You've put my mind at ease .

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