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TechToys V24 ”rebuild thread”

TechToys V24 ”rebuild thread”

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Old 11-07-2017, 08:31 PM
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This is my first new thread at rctech. I used to hang out at URC. Hope you like it!

RC power boats are something I know very little about. I built one back in the 80’s and powered it using an old slotcar motor. I drove it once and put it on the shelf.

Recently a friend who is into rc boats gave me a couple of leftover hulls. He is not knee-deep in RC like I am, between building a house, work and family he sometimes run RC boats in the evening to relax. He gave me a used Tech Toys V24 and one a NIB Graupner Speedy.

I decided to start with the V24. The Speedy deserves more knowledge than I currently possess, I reckon.

The V24 is a toy-grade boat - Mhz radio, fully integrated electronics, steering using dual 380 brushed motors and cutting power to one side to turn.

The motors were rusty and seized. Props broken. Transmitter non-existent. Lots of sand inside - from running in sea water.

After looking at the boat a few weeks and googling a lot I realized shafts and props were toy grade too and not easily available as spares. Two new 380:s and dual brushed controllers and using a delta mixer would have been neat but buying all that meant a) minor performance improvement and b) cash out.

I just pulled everything out and scrapped it. In my box of leftovers I found a Racerstar 540 brushless motor used in my MERV. Then I ordered some random axles, props, rudder etc from Bangood.

Last edited by KristofferR; 11-07-2017 at 08:39 PM. Reason: Hit send too early
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Old 11-08-2017, 11:39 AM
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I used hotglue and some scrap pieces of wood making a motor mount



Motor in position with a shaft from Banggood and a makeshift guide.



Just before testing the system. It sounds pretty cool.



Weight check; dont remember the numbers!



Orange is the new black. Or the opposite. I painted the windows black and put a stripe up front. It still looks meh but before it was worse.



Banggood rudder and snakes from my collection of RC airplane stuff. No cooling yet, TBD after first run.
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Old 11-13-2017, 02:32 PM
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I would use epoxy vs hot glue from past experence.
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Old 11-14-2017, 11:35 AM
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I’m normally not a hot glue person, do you think it will melt, get brittle - what happened to you?
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Old 11-14-2017, 01:14 PM
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I had problems with the glue holding to the plastic hull and it just pulled away. I would get a mount like this and two part epoxy, scuff hull. https://www.offshoreelectrics.com You will probably also want to go with water cooled electronics, boats draw lots of current and stuff gets warm quick.
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Old 01-18-2018, 12:56 PM
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I have bought some tubing and things to try to watercool it.

For now, the hotglue stays but I will keep a close eye on all joints.

I have tried the boat in the sink. It had a lot more pull than I expected. Motor performance is on a par with a good 540 brushed. Water leaked in around the propeller shaft so I added some sealing in form of UHU Por glue. Its a contact glue, very flexible.

I also painted it. I was bored and slightly frustrated and just went nuts with some leftover cans. I am personally satisfied with the result but I totally understand if you feel the opposite.






TechToys V24 hull, Racerstar 540 brushless, crazy paint.
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Old 06-13-2018, 09:36 AM
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I have finally tried the V24. First in the ocean, where it went crazy fast, jumping and flipped over in the waves and later the lid flew off. Next attempt, after adjustments, was in a lake where I could try it better.


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