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Cox Engine of The Month
June-2024
F4D Phantom II's

"Cox .049 Marine inboard engine."

More info on this engine!




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Post  enoone001 Mon Sep 09, 2019 11:36 pm

Hello! My 10-yr-old son found this motorized model boat in a creek near our house. He and his friend desperately want to restore it, but we have no idea where to start. What kind of engine would it need? Where do we get the remote control? What kind of fuel powers it? We just need some basic advice to get started. See photos. Thank you!

Please help my son restore this boat! A9e6e910
Please help my son restore this boat! De7d2810
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Post  1/2A Nut Tue Sep 10, 2019 12:10 am

This forum only deals with engine powered small hobby boats:
https://www.rcgroups.com/racing-boats-internal-combustion-58/



https://www.youtube.com/watch?v=5t4B1DYErYU



Jim Walker's Miss Thriftway .8cc Tether Boat
- he was very well known in his time.
Still is by folks flying control line vintage kits or
reproductions and plans. Circa 1940's



Very rare early 1950's Tether boat.  Totally restored by R-C CRAFT Toy Boats.
It was just a beat up bare hull, no deck or running gear. I added everything you see,
including the dash gauges, steering wheel and deck vents and seat. I will be making a
few copy's of this later.


This guy restores them:
https://www.youtube.com/user/RBOJCK/videos?view=0&sort=dd&shelf_id=1

Old Bugger Fishing sunny


Last edited by 1/2A Nut on Tue Sep 10, 2019 12:38 am; edited 2 times in total
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Post  Oldenginerod Tue Sep 10, 2019 12:21 am

If you have no experience with engine powered models then I would suggest that you try to find a local club to assist.  This may be a model aeroplane club or R/C car club.  They may be able to help you run the engine, or at lease figure out if it can still be used.
The engine is an OK Cub .049B.  It needs special glow fuel to run, not gasoline.  Glow fuel (often simply called nitro) is a mix of methanol, oil and nitromethane.  For this engine, you will need fuel that contains castor oil and at lease 10%-15% nitro.
While a little rusty, the engine should clean up ok, but be careful not to contaminate the pull starter cord with solvent or other cleaners.
You need to realise that this engine is only designed to run flat-out.  It has no throttle.  If you're looking to make the boat radio controlled then throttle control would be necessary.

For what it's worth, I understand the excitement of your son, but practically, I would suggest that you turn this boat into a nice ornament and go out and get yourselves a simple cheap electric R/C boat.  Simply look up ebay or Hobbyking.  Even the local toy store probably has something.

I don't want to burst your bubble.  It would be fun to get it going, just not all that practical with your low level of experience with this stuff.  Finding someone to help is your best option under these circumstances.
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Post  Marleysky Tue Sep 10, 2019 4:17 am

Greetings and welcome to the Cox Engine Forum.
You don’t include any info in your avatar to indicate where your located.
Rod has pointed out some valid concerns about restoration of the vintage boat your son and friend have found VS purchasing a New Electric RC boat for instant gratification.
If you and your son want to learn about small 2 cycle nitro powered engines and also how to build and restore wood model boats you could have Two new hobbies to keep you entertained!
The boat looks like it could be a older Dumas Model. They are still in business and offer a good selection of kits and accessories to outfit your restoration project.
http://www.dumasproducts.com/product_info.php?products_id=1259

The OK cub engine also looks to be complete and just a bit rusty. Does it turn over or is it “stuck” ? If it’s stuck, a good soaking in hot anti-freeze should  loosen up the old castor oil,  if its rusted and stuck a more careful and cautious approach to disassemble with out breaking or stripping anything!  

Just be aware , to restore the boat to it’s original condition, like Rod indicated, it will run full speed, like the one in the video.  But if done with TLC and patience it could look like this: Please help my son restore this boat! D99d2110
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Post  Mark Diedrichs Wed Sep 11, 2019 1:04 am

Please help my son restore this boat! 20190322
We will do all we can to help you, unless this a cat fishing boat???? More info would greatly appreciated . Mark
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Post  DrCox Wed Sep 11, 2019 7:40 pm

enoone001 wrote:Hello! My 10-yr-old son found this motorized model boat in a creek near our house. He and his friend desperately want to restore it, but we have no idea where to start. What kind of engine would it need? Where do we get the remote control? What kind of fuel powers it? We just need some basic advice to get started. See photos. Thank you!

Please help my son restore this boat! De7d2810

Please help my son restore this boat! A7ed4510

Could be off base, but it "appears" that the power plant for this boat may have originally been built for a battery powered motor and not gas powered.

From the limited images supplied, it has a "hint" of the Chris Craft Special, even though it is not.

Please help my son restore this boat! QpCGQAk
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Post  KariFS Wed Sep 11, 2019 8:28 pm

Nice find! If the hull is solid, a good clean-up, possibly followed by some light sanding and fresh paint should make it look good. Maybe some balsa and thin plywood to build it to look a bit like the Chris Craft in Doc’s picture.

For the engine, there is plenty of discussion about freeing and cleaning them here on the forum. Should there be something broken beyond repair, I am sure some of the guys can help you find the necessary parts. Or you might want to go electric. Are you going to retrofit it with remote control or keep it as a free-going or tether?

It depends on the 10-year old, but this has a lot of potential to become a good learning project, still preferably done under adult supervision.
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Post  rsv1cox Wed Sep 11, 2019 8:52 pm

The potential is there, you just have to exploit it.  Juvenile minds are like sponges.  I showed my great grandson how to disassemble a Cox .049 just once and he repeated it perfectly.  But, your engine isn't so easy.  I would go electric and a two channel R/C set (throttle and rudder) with micro servos many found cheap on ebay.

Electrics are so much more friendly to boats than glow plug engines in many ways.   I have had both and electrics are much better.
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