Engine turning while towing

Aircraft powered airboat discussion.
rowdy1
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Engine turning while towing

Postby rowdy1 » Fri Apr 14, 2017 9:54 pm

Anyone ever seen an aircraft engine turning over while towing? I was running south on I-75 between Gainesville and Ocala this morning in the hammer lane around 80mph and came up on an airboat with a straight valve 540, with a 6 blade warp drive. The prop was turning about a quarter turn at a time. I backed off and followed him for about 15 miles, it must have made 25 - 30 revolutions. That cant be good for the motor. BTW I looked very close, no gearbox or anything out of the ordinary, and all of the plugs and wires were on it. That thing must have been worn out.

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Huntingwithahoyt
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Re: Engine turning while towing

Postby Huntingwithahoyt » Sat Apr 15, 2017 9:14 pm

Hmmmm....that's weird....I have a 520 continental and there's no way mine could do that....heck its hard to turn by hand.....of course mine is not worn out though....

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Sarahj
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Re: Engine turning while towing

Postby Sarahj » Sun Apr 16, 2017 4:35 am

Was the boat named blow by? 90hp 0-540 sponsored by aeroshell? :lol:
Old School 10ft Taylor 0-320 63" Sensenich H Series

twister69z
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Re: Engine turning while towing

Postby twister69z » Sun Apr 16, 2017 8:18 am

Had a A-65 continental that would start by itself if I forgot to turn the mags off.
If you don't have time to do it right the first time ,
Where are you going to get the time to do it a second time?

Scarecrow
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Re: Engine turning while towing

Postby Scarecrow » Sun Apr 16, 2017 8:54 am

Twister; you being an ace mechanic I wouldn't be telling that story. LOL

SWAMPHUNTER45
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Re: Engine turning while towing

Postby SWAMPHUNTER45 » Sun Apr 16, 2017 9:01 am

Not being an Aircraft guy I was thinking about that possibility of it firing off if the mags were left on.

I could see it happening

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HAMMERHEAD
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Re: Engine turning while towing

Postby HAMMERHEAD » Sun Apr 16, 2017 9:32 am

Guys my race boat with over 300 PSI cranking pressure will turn a little when pulling long distance. Our supercharged boat would turn a revolution about every mile. If you turn the motor very slowly the compression will bleed off, it's not a big deal!

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HAMMERHEAD
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Re: Engine turning while towing

Postby HAMMERHEAD » Sun Apr 16, 2017 9:33 am

Scarecrow wrote:Twister; you being an ace mechanic I wouldn't be telling that story. LOL

Sounds to me like a well tuned motor! Good job Twister!

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John Fenner
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Re: Engine turning while towing

Postby John Fenner » Mon Apr 17, 2017 9:08 am

Not uncommon to windmill, no harm in it, proper rotation, pre oiling for cold starting. My cousin would sneak over to a buddy's 65 Continental and kick the mags on when he wasn't looking, boat would be idling when he got to the ramp, funny wtf moment.
I never finish anyth,,,.

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digginfool
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Re: Engine turning while towing

Postby digginfool » Mon Apr 17, 2017 9:36 am

I've seen it happen to AC boats going down the highway; same thing, about a 1/4 turn every so often.
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