Model Boat Mayhem

The Shipyard ( Dry Dock ): Builds & Questions => Pleasure boats, Sports, Race, Power and Leisure Boats: => Topic started by: edible_engine on July 06, 2007, 06:37:59 pm

Title: my twin strimmer air boat
Post by: edible_engine on July 06, 2007, 06:37:59 pm: i recently got two homelite trimmers rather that macking a water propped boat i opted to make an air boat as i thought it would be cheaper and simpler here are the pics so far.
(http://i142.photobucket.com/albums/r93/robin_crash24/P3240001.jpg)

(http://i142.photobucket.com/albums/r93/robin_crash24/P3240002.jpg)

(http://i142.photobucket.com/albums/r93/robin_crash24/P3250003.jpg)

(http://i142.photobucket.com/albums/r93/robin_crash24/P3250004.jpg)
Title: Re: my twin strimmer air boat
Post by: Martin (Admin) on July 06, 2007, 08:53:43 pm: Man that BIG and very dangerous looking!! :o
Can I have a go when it's finished?!?!
Title: Re: my twin strimmer air boat
Post by: martno1fan on July 08, 2007, 09:44:23 pm: very interesting concept, ive seen a cpl of builds using twins and even one that ran two engines back to back .thats one as a puller and the other a pusher , not sure how well it will work but i cant wait to see how she goes.heres a very usefull build thread for you check it out.
http://cajungatorairboats.com/v-web/bulletin/bb/viewtopic.php?t=116 (http://cajungatorairboats.com/v-web/bulletin/bb/viewtopic.php?t=116)
Title: Re: my twin strimmer air boat
Post by: J.beazley on July 08, 2007, 09:52:44 pm: Looks like a very interesting build and its coming on nicely, just a thought its going to be very hard to get both engines to run similar rpm together then again ive never seen a twin engined airboat either.

nice fresh ideas good thinking ;D

Jay
Title: Re: my twin strimmer air boat
Post by: catengineman on July 08, 2007, 09:59:08 pm: I would think that independant engines would assist in turning such a beast

And like a hovercraft to stop it you will have to 'about turn' quickly

something I was never very good at !

Richard, just my thoughts
Title: Re: my twin strimmer air boat
Post by: edible_engine on July 08, 2007, 10:58:58 pm: Any one no where i can get 2 prop hubs made ???

heres the plans (http://i142.photobucket.com/albums/r93/robin_crash24/LastScan.jpg)
Title: Re: my twin strimmer air boat
Post by: HS93 (RIP) on July 08, 2007, 11:16:45 pm: Don't know whether you have thought about some bracing as they are big motors to stop the mounts moving sideways and breaking the joints. just a thought , anyway you could use piano wire to brace. not a very good drawring
Peter
Title: Re: my twin strimmer air boat
Post by: banjo on July 08, 2007, 11:40:20 pm: Fantastic....

My late Uncle Charlie was working on a similar project when he was taken..
Title: Re: my twin strimmer air boat
Post by: edible_engine on July 08, 2007, 11:50:15 pm: i was going to put a x in the middle of it out of wood.
Title: Re: my twin strimmer air boat
Post by: banjo on July 08, 2007, 11:57:58 pm: I shall watch your progress....
I remembered you were making some model props previously....how did they turn out?

Why not just try it with one engine at first..get that running well and then make model Mk II with two engines...
Title: Re: my twin strimmer air boat
Post by: edible_engine on July 09, 2007, 10:16:10 am: i never did make a tug in the end i have most of the parts to make one now il get some pics of the props i made.
Title: Re: my twin strimmer air boat
Post by: edible_engine on July 10, 2007, 11:30:51 pm: just got an email back from a seller on ebay who i asked to Price up the prop hubs in the picks it came to £30 + vat + postage is that a bit steep ??? ???
Title: Re: my twin strimmer air boat
Post by: tobyker on July 13, 2007, 11:08:17 pm: For a prototype twin-engined airboat see the gallery at Canadianairboats.com. she is 30' x 16'.
Title: Re: my twin strimmer air boat
Post by: glennb2006 on July 23, 2007, 08:35:09 pm: Quote from: edible_engine on July 08, 2007, 10:58:58 pm
Any one no where i can get 2 prop hubs made ???

heres the plans (http://i142.photobucket.com/albums/r93/robin_crash24/LastScan.jpg)

Give Andy Payne a shout, always handy for the odd bits and bobs you need making up:

Andy Payne www.omra-uk.org/GTE 01621 891455 (Great Totham, Essex)
Watercooling conversions for all sizes of car and aero engines, manifolds, couplings, rudders etc. Z class tuned pipes and gearboxes - a specialist in one-off engineering.

Glenn
Title: Re: my twin strimmer air boat
Post by: edible_engine on July 28, 2007, 12:28:44 am: cheers
Title: Re: my twin strimmer air boat
Post by: edible_engine on August 28, 2007, 02:57:46 am: more pics just need the 2 new props and petrollines what shud i use becuse the petrol makes the silicone tube go spongy and weard and the thinest plastic tubing at b&Q is to thick ive herd of tygon tubing but wher do i get it from ?

(http://i142.photobucket.com/albums/r93/robin_crash24/P1210002.jpg)

(http://i142.photobucket.com/albums/r93/robin_crash24/P1210003.jpg)

(http://i142.photobucket.com/albums/r93/robin_crash24/P1210004.jpg)

(http://i142.photobucket.com/albums/r93/robin_crash24/P1210005.jpg)

(http://i142.photobucket.com/albums/r93/robin_crash24/P1210006.jpg)
Title: Re: my twin strimmer air boat
Post by: tigertiger on August 28, 2007, 04:04:18 am: Quote from: edible_engine on August 28, 2007, 02:57:46 am
more pics just need the 2 new props and petrollines what shud i use becuse the petrol makes the silicone tube go spongy and weard and the thinest plastic tubing at b&Q is to thick ive herd of tygon tubing but wher do i get it from ?

Have you tried a lawn mower shop or even a motorcycle shop.
Some bikes still use plastic fuel lines.

It is very flexible when warmed in a bowl of very hot water.
Title: Re: my twin strimmer air boat
Post by: martno1fan on August 28, 2007, 08:46:58 am: Please tell me your not going to run that boat with the servos exposed like that? airboats flip believe me i have one and when you flip thats the end of your expensive servos and any other electrics that arent in a water tight box.you need tygon fuel line for petrol motors the stuff from the mower shop tends to go hard and brittle after a while.heres a link to tygon tube.
http://www.prestwich.ndirect.co.uk/zenoahmarineengines.htm (http://www.prestwich.ndirect.co.uk/zenoahmarineengines.htm)
Title: Re: my twin strimmer air boat
Post by: edible_engine on August 28, 2007, 12:43:33 pm: thanks its a bit expensive but oh well. as for the servos i usually take them apart and put more white grease in the gears and i coat the out side in epoxy and i cut a slice of fuel tube and put it under the servo horn. some of my boats have been flipped along time and the servos have been fine.
Title: Re: my twin strimmer air boat
Post by: martno1fan on August 28, 2007, 01:53:36 pm: dont use grease it doesnt work best thing to use is corosion x or similar from any motorcycle shop,simply spray the insides of your servos and rx and all plugs etc and 100% waterproof even in salt water O0.
http://cgi.ebay.co.uk/ACF50-ANTI-CORROSION-RUST-SPRAY-ACF-50-HONDA-YAMAHA-BMW_W0QQitemZ110162779548QQihZ001QQcategoryZ25644QQssPageNameZWDVWQQrdZ1QQcmdZViewItem (http://cgi.ebay.co.uk/ACF50-ANTI-CORROSION-RUST-SPRAY-ACF-50-HONDA-YAMAHA-BMW_W0QQitemZ110162779548QQihZ001QQcategoryZ25644QQssPageNameZWDVWQQrdZ1QQcmdZViewItem)
Title: Re: my twin strimmer air boat
Post by: edible_engine on August 28, 2007, 07:53:29 pm: i only pack the gears with white grease not the rest.
Title: Re: my twin strimmer air boat
Post by: martno1fan on August 28, 2007, 08:33:57 pm: why ? just use the stuff i linked it lasts a season and the can will last years.
Title: Re: my twin strimmer air boat
Post by: edible_engine on September 04, 2007, 09:39:31 pm: the battery's in the video cam wend flat and stooped after a couple seconds i need to repair it after hitting a band make a way to stop the engines and make the rudders bigger anyone now any bigger places around plymouth for model boats plymouth

(http://i142.photobucket.com/albums/r93/robin_crash24/DSCF1769.jpg)

(http://i142.photobucket.com/albums/r93/robin_crash24/P2030065.jpg)

(http://i142.photobucket.com/albums/r93/robin_crash24/th_DSCF1764.jpg) (http://s142.photobucket.com/albums/r93/robin_crash24/?action=view&current=DSCF1764.flv)

(http://i142.photobucket.com/albums/r93/robin_crash24/th_DSCF1765.jpg) (http://s142.photobucket.com/albums/r93/robin_crash24/?action=view&current=DSCF1765.flv)

(http://i142.photobucket.com/albums/r93/robin_crash24/P2030064.jpg)

(http://i142.photobucket.com/albums/r93/robin_crash24/th_DSCF1766.jpg) (http://s142.photobucket.com/albums/r93/robin_crash24/?action=view&current=DSCF1766.flv)
Title: Re: my twin strimmer air boat
Post by: martno1fan on September 04, 2007, 10:29:24 pm: Sounds awesome ,just set the throttle so you can cut the engines with the throttle servo from the radio.if your not intending to run on land extend the rudders into the water a bit that will help steering a lot !!
Title: Re: my twin strimmer air boat
Post by: edible_engine on September 04, 2007, 11:53:21 pm: here yah go guys sory about the quality it was done on a fone
http://www.youtube.com/watch?v=wZmeZYN8Mm0
Title: Re: my twin strimmer air boat
Post by: Kmot on September 09, 2007, 03:06:19 am: I saw this on ebay the other day! As I said there, it sounds wicked!! O0
Title: Re: my twin strimmer air boat
Post by: Martin (Admin) on September 09, 2007, 08:04:58 am: Fast!
Title: Re: my twin strimmer air boat
Post by: edible_engine on September 09, 2007, 09:52:02 pm: ha ha i wish, i think i could get it to go faster if i get new carbs on the engine the mixture setting is limited and i need to run them on half choke. anyone no how a water brake works? think i need one it stays on the plain for a while after i let of the gas. ime going to weld up a new mount out of small size box section from b&q need to get a new prop and a rudder servo as it cant handle the prop wash and it striped the gears when the engine stand fell of a chair in my garden and it was a decent one >:(