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Old Jul 31, 2012, 04:37 PM
team sleprock
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United States, WA, Port Angeles
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dumas dragonfly 20 MkII

Ok someone just shoot me now! as I hate those please help me decide threads!

So here goes, first of all a lil background, been in RC since mid eighties! mostly planes, later some heli's and now this shows up at my door! Hmmm dunno how that happened,

I built some boats when I was but a youngin, but only ever got one running!(mostly money and lugistics) I am quit confident I have the skills ta do a great job, just lack some knowledge!

so the Dumas dragonfly 20 MkII can either be built with a 3.5 outboard, or a 21 inboard! I can see how the outboard could be the easier set-up ta start, but which set-up is gonna be the most reliable?
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Old Aug 01, 2012, 12:24 AM
RC boat Rock Star
Kalamazoo, MI
Joined Apr 2004
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I haven't seen one of those in ages!
With an outboard you're going to have to put as much weight forward as possible to get the CG right. The inboard would be easier in some weays. If you went that route I sure wouldn't use Dumas hardware but something more modern with a flex cable drive instead of the ancient hard straight shaft setup.
Outboard seem to be more reliable as hte K&B's can take the abuse and live to run another day. The problem is finding a new one as K&B/MECOA doesn't really seem to care any more about them. An O.S. .21 is an option although pricey. On the other side of the coin, a decent .21 inboard isn't going to be cheap either. Nova Rossi does have a very good one that's about half the price of a CMB.
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Old Aug 01, 2012, 06:26 AM
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http://www.ebay.com/itm/130299301011...84.m1423.l2649

http://www.ebay.com/itm/320642177611...84.m1423.l2649
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Old Aug 01, 2012, 09:10 AM
RC boat Rock Star
Kalamazoo, MI
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The stuff in that first link is also available from www.zippkits.com .
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Old Aug 01, 2012, 09:12 AM
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Put an outboard on it and put the gas tank in the nose
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Old Aug 01, 2012, 09:30 AM
RC boat Rock Star
Kalamazoo, MI
Joined Apr 2004
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With a little tweaking on the kit it could look something like this if you wanted to go the OB route.
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Old Aug 05, 2012, 04:54 AM
team sleprock
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http://zippkits.com/~zippkits/index....roducts_id=315

http://www.hobbypartz.com/72p-21m.html

would this make a good sport boat?
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Old Aug 05, 2012, 09:26 AM
RC boat Rock Star
Kalamazoo, MI
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No, that hardware is for their JAE outrigger hydro kit.
What you need is their rudder and this strut, http://zippkits.com/~zippkits/index....roducts_id=264 .
With that engine, you get what you pay for as that's just considered a sport motor, basically a plane motor with a water-cooled head.
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Old Aug 20, 2012, 10:01 PM
team sleprock
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United States, WA, Port Angeles
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ok so I'm leaning owards an inboard! just so I'm not locked into one brand of drive!

as yet ta be determand!

got most of the hull done, just need ta put some sealent on the framework, and put in some floatation! then I can glue the decking on!


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Old Mar 31, 2013, 12:58 PM
team sleprock
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ok boys and girls! I know it's been awhile!

so just too update what's going on! been looking for the right deal, and still didn't know which way to go, until this!

http://www.ebay.com/itm/K-B-3-5-cc-O...p2047675.l2557

atleast now I know how she will be power'd! I hope that patience will pay off!
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Old Apr 01, 2013, 07:55 PM
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ok with the engine on it's way! I fig'd I better start painting!
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Old Apr 05, 2013, 11:31 PM
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so far looking like she'll float!
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Old Apr 06, 2013, 12:55 AM
team sleprock
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a question for anyone running nitro boats!

ok coming from the aircraft arena, I know that you adjust the high end a lil rich, so when the plane gets airborn, and unloads the engine, it naturaly leans itself out!

ok with a boat, it would only make sense that it would be backwards, lean the engine out, so it would run better when it is in the water under load?

I read that it only takes about ten minuts of running on the rich side, too brake in the K&B outboard! so was just wondering how lean one should go after brake-in?

thanks in advance! the KID!
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