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Fitting Wooden Props On A Petrol Engine

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Adrian Smith 129/05/2013 20:06:38
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2477 forum posts
1273 photos

My new 50 cc MVVS petrol engine has come supplied with 3 bolts to secure the prop to the propeller washer. However, the prop washer has facility to fit a total of 6 bolts to the prop driver. Is that overkill or do I need to aquire more bolts to complete the installation?

stu knowles29/05/2013 21:06:49
613 forum posts
53 photos

I've always thought that multi bolt prop drivers are a hassle best avoided. It is possible to get a converter if you are a similar mind and the spacings are correct.

As for your original question, the ones that i have seen & used have had a full complement of bolts.

stu k

Turbycat29/05/2013 21:12:52
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594 forum posts
55 photos

Think you'll be fine with the 3 bolts. My 35cc petrol has the nut on the end of the crank. Never had a problem. My full size Druine Turbulent only had 6 bolts on a 1700cc converted vw motor spinning a54" (I think) prop.

Andy

Adrian Smith 129/05/2013 22:10:24
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2477 forum posts
1273 photos

Thanks guys. I must admit I have bought a prop nut that fits the crank. I tend to go for the belt and bracers option, but as I am new to gassers I thought I would ask the question.

Steve Dorling31/05/2013 09:05:37
41 forum posts
1 articles

Multi bolt fixings are a pain and less safe than a single big crank fixing (as per Zenoah etc) but they look pretty don't they!

Edited By Steve Dorling on 31/05/2013 09:05:51

Simon Chambers31/05/2013 10:06:01
789 forum posts
42 photos

I believe multi-bolts spread the load a lot better across the front. Also you don't have the risk of a single fixing that can come undone.

Si.

Adrian Smith 131/05/2013 11:30:48
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2477 forum posts
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Yes Steve they do look pretty! I thought as I had multipurpose template and the use of a drill press in my workshop I would give it go. Surprisingly it didn't take long to drill six correctly positioned holes, but it is a bit of a faff as I am going to predrill a couple of other props because I am bound to bust one to start off with!

cymaz31/05/2013 15:23:47
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9333 forum posts
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I've been told ( I don't how true it is though) that it is always wise to slacken off the prop. It can get loose on the boss if left done up tight as the wood will crush and shrink in the dry when not used for a length of time.

Adrian Smith 131/05/2013 16:17:33
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2477 forum posts
1273 photos

Mmmmm.... interesting cymaz. Not heard that one. Do you mean after every session loosen off the prop? I can see where you are coming from though. The MVVS instructions only say to check for tightness of the bolts and crankshaft nut at the start of every session. May be somebody knows better?

Mudflap31/05/2013 17:55:29
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37 forum posts
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It's good practice to loosen the prop bolts after a weekends flying, wooden props will indeed crush if left tight over time. I check mine at the start of each flying day.

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