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Cox .049 1/2a outrigger hydroplane build - 9/28/2012 2:20 AM   
dustint209


 

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Status: offline 		I used the carb off a .05 that came from a sportworks Chaos. I need to do a little fine tuning but this thing revs faster than a crotch rocket!! I am in the process of building a 15" outrigger. I'm going for the old school look! lol Enjoy and please ask questions!!

Video
http://s83.photobucket.com/albums/j290/dustint209/?action=view¤t=SAM_0675.mp4








< Message edited by dustint209 -- 10/9/2012 2:25 AM >

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RE: Cox .049 1/2a outrigger hydroplane build - 9/28/2012 2:32 PM   
carlnoki


 

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Status: offline 		very nice to see someone trying new things and they really work out for them.

just remember that in the water, the responce till be slower than with a regular aircraft prop
on it.

great job!!!!!!!!!!!!

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RE: Cox .049 1/2a outrigger hydroplane build - 9/30/2012 1:30 AM   
wave waker


 

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Status: offline 		good job please keep posting, i have cox .049 and i don't know what to do with it, may end up small airboat.

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RE: Cox .049 1/2a outrigger hydroplane build - 10/1/2012 4:46 PM   
dustint209


 

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Status: offline 		Made the motor mount and hooked up throttle servo





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RE: Cox .049 1/2a outrigger hydroplane build - 10/5/2012 3:52 PM   
Ron Olson



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Status: offline 		That's a lot of carb for a small motor like the .049. When they get too big a problem of getting the fuel to atomize enough comes into play.
A friend and I thought about trying to make a 1/2-A 'rigger for the fun of it but that's as far as it got. Weight is really important as you need to cut it where you can. I've got some carbon fiber rod that I'd use instead of the brass tubing for boom tubes, lighter and stronger. Move the motor further forward, as close as possible to the rear boom tube. Put a 1 or 2 ounce max tank between the tubes. Lightness fanatics will even take the RX out of the plastic box and spray it down with Corrosion X.
Finding s good prop isn't easy. Octura makes an X-430, possibly an X-427. Plastic props in a small size will flex too much.

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RE: Cox .049 1/2a outrigger hydroplane build - 10/5/2012 8:48 PM   
dustint209


 

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Status: offline 		But the Carb came from a .05 motor. I placed the motor that far back to get my cog. I am a little worried about weight though.

< Message edited by dustint209 -- 10/5/2012 10:08 PM >

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RE: Cox .049 1/2a outrigger hydroplane build - 10/6/2012 2:19 PM   
Ron Olson



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Status: offline 		Lightness really matters in the little boats. Glenn Quarles figured that with his .12 powered nitro 'rigger that an ounce made a 3 MPH difference. He was going to extremes on his record-setting boat, going as far as removing the mounting tabs and drilling holes in the servos plus removing the case on his receiver as grams added up to ounces. By the time he was done, there was barely enough boat left to float! Guys like you and me aren't going to go that far but it just shows what lengths some will go to for that extra MPH.
Think small. You already have a tiny servo for the throttle and you're going to need one for the rudder. Micro or nano-sized RX's and battery packs will also help you to dump the weight. Something like a 4-cell 50 mah pack is plenty but may need recharging for any more than a couple of runs.
Later on, if you want to try something more new-school, there are some really small electric 'riggers that would be good candidates for .049 power.

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RE: Cox .049 1/2a outrigger hydroplane build - 10/6/2012 11:47 PM   
coriolan


 

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Status: offline 		Agree with Ron, the carb is too big for a Cox .049 reedy(its OK for a .05 size car engine because they use an air filter). Throttle isn't really needed with 1/2A boats, here is a video of a small outrigger powered by a Cox Black widow:
http://youtu.be/ohyQuig0E2g
We had a thread at RCG about that size of boats:
http://www.rcgroups.com/forums/showthread.php?t=1397709
and there is one here on RCU:
http://www.rcuniverse.com/forum/m_8498373/mpage_13/key_/tm.htm
1/2A boats don't need a throttle, which save the weight of a servo and linkage, some receivers and servos for micro use works well on a single Lipo cell(3.7V)as even the rudder doesn't requires much torque.

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RE: Cox .049 1/2a outrigger hydroplane build - 10/7/2012 4:26 AM   
Ron Olson



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Status: offline 		It's still nice to be able to throttle any engine so that's just the little thing that I have to disagree with as you don't want it coming to shore WOT. I had some exhaust throttles for the .049 and .051's that seemed to be in demand.
Somewhere in the shop I've got a cigar box loaded with some .049's, mostly Cox but there should be at least one OK Cub which uses a regular glow plug.

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RE: Cox .049 1/2a outrigger hydroplane build - 10/7/2012 5:02 PM   
coriolan


 

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Status: offline 		+1 on the exhaust throttle Ron, a much better option for .049 Cox than a carb(I have one of the Tarno carb with adapter for Cox TD&reedy) they can be bought from Bernie at Cox International:
http://coxengines.ca/throttle-ring-for-cox-049-engine.html
But still think a throttle on a 1/2A powered boat isn't necessary as they're not very fast or heavy!

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RE: Cox .049 1/2a outrigger hydroplane build - 10/7/2012 6:31 PM   
Ron Olson



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Status: offline 		Anyway, I'm pulling for you to see how this project goes. For many years now I've loved messing with the bigger .12 engines, way before their popularity. I've got 2 mono's, had some 'riggers and even built a Sport 12 hydro that I've still got to get wet yet as there isn't any in the record books yet so I could easily get my name in there for SAW and 2-lap oval.

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RE: Cox .049 1/2a outrigger hydroplane build - 10/8/2012 12:22 AM   
Slideblues


 

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Status: offline 		Get a JAE .12 kit and narrow tha tub for the .049, custom tank, carb or ext throttle,
Maybe narrow the sponson bottoms.........Hmmmmmmmm?
Dang it Kemosawbe ya git me thinking again!
Gene

Im with Ron on the throttle, Comming in a WOT reguardless of speed could get hairy........

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RE: Cox .049 1/2a outrigger hydroplane build - 10/8/2012 1:22 AM   
coriolan


 

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Status: offline 		Would be "hairy" if it was an .049 Cyclon or Fora for power, the Cox reedy aren't much of a power house at the best of time as the reed valve start floating above 20000 rpm. The reason why L. Cox had the TD serie developed a long time ago, there was quite a few 1/2A sized boats in the 50's mostly for tether or free running as there was no small enough radio back then.

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RE: Cox .049 1/2a outrigger hydroplane build - 10/8/2012 4:38 AM   
Ron Olson



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Status: offline 		Gene, the smaller JAE FE boats would be better conversions for an .049, where my mind was at in an earlier posting.
Way back around 1979 I built a Dumas Deep-Vee 10 with a Cox TD .051 in it. I never got the thing to run right. Way before that in the late `60's I had an .049 powered free-runner where you just set the rudder and it ran in circles. The boat ran pretty well for what it was and it would get some good air hitting waves.

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RE: Cox .049 1/2a outrigger hydroplane build - 10/8/2012 11:16 AM   
Slideblues


 

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Status: offline 		Yea the extent of my .049 experience was planes.
Cox mustang and some twin tail flying wing combat, Ya just supposed to cut tha streamer right?
Ha! Went like ooh... ahh... whaa... smack! Rebuild, repeat.......

Cool ideas thou, Blast from the past always fun.
Gene

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RE: Cox .049 1/2a outrigger hydroplane build - 10/8/2012 2:27 PM   
Joe Petro


 

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Status: offline 		PDF plans for the JAE Micro are soon to be released.
This is the 12 inch version of the popular JAE outrigger hydros.

This would make a very suitable platform for a 1/2A conversion.

I really love the old Cox stuff...

Joe

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RE: Cox .049 1/2a outrigger hydroplane build - 10/9/2012 2:41 AM   
dustint209


 

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Status: offline 		Thanks for all the help and advice guys! I have given up on the carb lol. It works great for a few seconds than just loads up no matter how I tune it. I ordered an exhaust collector from cox. The tip is rectangular, so I plan to buy a piece of rectangle tubing that will slide in and out of the tip and cut a v-notch in it to do an exhaust throttle. I would have just gotten a throttle ring but I want to divert the oil and exhaust away from the boat.

Also waiting on a 5-40 bolt to finish my drive shaft cause all three LHS's and all bolt stores in town don't stock that size and pitch! ****

I'm not really going for speed (obviously). It will probably be more of a shelf queen/conversation piece lol. I thought about trying to incorporate gold leaf somewhere on the boat. Hmmmmm

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RE: Cox .049 1/2a outrigger hydroplane build - 10/9/2012 4:28 AM   
Ron Olson



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Status: offline 		Really? You can't find a 5-40 bolt? Usually they're under Team Losi parts as they used them for years. Sometimes certain parts are right under the LHS's noses but don't know where to look.

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RE: Cox .049 1/2a outrigger hydroplane build - 10/9/2012 6:04 AM   
coriolan


 

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Status: offline 		CoxInternational carry all Cox parts:
http://coxengines.ca/cox-.049-propeller-screw-socket-long-black-2.html
http://coxengines.ca/cox-049-051/


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RE: Cox .049 1/2a outrigger hydroplane build - 10/9/2012 4:11 PM   
dustint209


 

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Status: offline 		Well I ordered the screws from fastenal and they will be here Thursday. They are 1 1/2 in long and half threaded. I will machine down the shoulder with the lathe at work so that the bolt will slip into my brass tube driveshaft. I will connect the other side to an aluminum Cv shaft from a losi mini t and use the bearing hub to support it. I would have used a flex shaft but I think the cv shaft with bearings will give less resistance.

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RE: Cox .049 1/2a outrigger hydroplane build - 10/9/2012 7:23 PM   
coriolan


 

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Status: offline 		5-40 thread size are actually 1/8" OD so you can connect the non threaded part to an Octura 1/8" collet fitting from OSE, that's what I do for my 1/2A boats:
http://www.offshoreelectrics.com/proddetail.php?prod=oct-ocfhe18098
http://www.rcgroups.com/forums/showthread.php?t=1402179#post17606710
http://www.rcgroups.com/forums/showthread.php?t=1416191#post17841959


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RE: Cox .049 1/2a outrigger hydroplane build - 12/3/2012 8:37 AM   
Pond Skipper



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Status: offline 		When I go to the vid it says..

This is a Private Album



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