1/10 Crackerbox brushless build

[befu]

Sounds cool! Did you get that radio I sent you Brian?

yes I did, works perfectly. Thank you man!

When we were running tonight, there was a guy there with his young daughter. We talked about the boats and what I was trying to do with getting a group together locally to run, build a boat for a parent child relationship builder. Talked about the boat and what the real cost was vs. what the cost of what we built. He seemed like he thought it was a good idea and walked on at the park.

As we were putting away our stuff, he came back and his daughter had a walmart $20 boat to see if she liked it. I gave him my contact info and told him she could run some of our stuff if she wanted next time to see if she liked the faster stuff. So maybe this will take off. Fostering parent relationships while building real life skills and having fun!

Brian

[forescott]

Glad to help. I'll keep an eye on this thread and let you know if I can donate any other parts/batteries.

[venom*one]

you have a pm sir...

[befu]

done

Done, well, for now! Finished up the hatches tonight. I let the boys go with model paint and brushes on the hatch covers...... Yeah, gotta work on that!

Anyways, I added a strip of plastic in front of the hatch so the front end slips under it securing the front. Then, I used two servo horns with some 3mm bolts on the back to make a couple of pivot latches. Now no tape ( ) and the boys can open and close them alone. Teach them to launch and retrieve them and it should go well. Other than them being closer to the water, wet shoes, mud, falling in...... What am I thinking!

I am happy how these turned out. I also think the brushless motors are going to be fantastic, and these have quite a bit of power. 2s and 27mm prop is good for them to learn on. 3s and 35mm capacity will give them plenty to advance towards and break stuff! I really didn't want a brushed motor that would have heat problems and need maintenance.

Thank you to all who have helped, supported and/or offered advice. It has been a fun start to a project that I hope takes off.

I will have to turn this into a running information thread now as we get performance numbers.

Brian and two of the four cubscouts. (Den leader with his project included as well!)

[befu]

Running

Got some more video on Saturday with the boys, will need to edit it and post some videos.

Started with some 2s-4800 lipos, still running the 27mm props on the 1700kv mystery's. Didn't work so well. The boats would run bow down and push water. Everynow and then they would start running drier and skipping, but then they would stick back down. I was hoping the weight of the 4800 lipo's would help plant the transom. Trim tabs were bent up to the point they were positive.

Brought them back in and went to the lighter 2200 packs. Ran better, but still would push a lot of water.

Then Charlie hit a cat tail underwater and busted his prop. The good news is the kick up rudders have been working perfectly! Once they kick up, you can still steer the boat since only the rudder kicks up and not the steering bracket.

So I took the old 27mm prop off and put on a 32mm prop. These are all the black plastic OSE props. Well, he put it in and punched it and almost lost the boat flipping over backwards! That definately changed things. Now it rides dry and skipping. Put a 30mm on the other boat and they had a blast, both ended up flipped a couple of times.

Now that I got the prop issue worked out, I will have to try the 2s-4800 again to see if the extra weight helps some.

Glad I went with these little cheap outrunners. Originally, someone on another forum suggested a 2860-3500kv motor on a 60 amp speed control.

I am telling you what, other than specified racing, I would ditch those brushed motors. No maintenance and they will run submerged with the epoxy sealing! That Mystery has plenty of power to get you into trouble. Will have to use the data logger to get rpm, speed and amps.

[venom*one]

box headed your way...

[poobs]

Great thread Brian ! Thanks for pointing it out to me. :)

[tiqueman]

They look great Brian. Silly fun! Reminds me of my brushless Mini Rio... can get crazy real quick. Very well done.

[poobs]

My son finally got to run his crackerbox today with the Ebay 1700 motor and 2S.
It has an old 431 plastic prop with a piece of blade missing.

It seemed as fast as the original car motor with 8 nicads - nice!!!

[befu]

My son finally got to run his crackerbox today with the Ebay 1700 motor and 2S.
It has an old 431 plastic prop with a piece of blade missing.

It seemed as fast as the original car motor with 8 nicads - nice!!!

I am telling you, this motor is perfect for this boat. You can fit a 35mm prop on it also, and the motor handles it easily on 2s. heck, we were getting about 15 minutes of run time on a 2s-2200-20c turnigy, they are like $9 at HK! And if you want, bump it to 3s to really overpower it. Lots of fun for a power package of around $35! (motor, esc, bat)

You should get those couplers in a few days. Hope they work.

Brian

[poobs]

I am telling you, this motor is perfect for this boat. You can fit a 35mm prop on it also, and the motor handles it easily on 2s. heck, we were getting about 15 minutes of run time on a 2s-2200-20c turnigy, they are like $9 at HK! And if you want, bump it to 3s to really overpower it. Lots of fun for a power package of around $35! (motor, esc, bat)

You should get those couplers in a few days. Hope they work.

Brian

I did not get that much run time out of mine but my kid loved it. Gotta check my battery and see if my one Li- po charger is working ok.

The motor was pretty hot too.

[befu]

That run time was with 8 and 10 year olds. So some full speed, some partial running, some laughing. Even at the average 12 amps at WOT, a 2200 Lipo should last 11 minutes.

I have not checked motor temps on it with my IR gauge. Will have to get back out and get some more info.

What size battery were you using and how long did it last?

Brian

[poobs]

That run time was with 8 and 10 year olds. So some full speed, some partial running, some laughing. Even at the average 12 amps at WOT, a 2200 Lipo should last 11 minutes.

I have not checked motor temps on it with my IR gauge. Will have to get back out and get some more info.

What size battery were you using and how long did it last?

Brian

The battery that I used is a 2100Mah. 2S 20C.

Funny but it has already started to bulge out a bit

[venom*one]

I got mine in the mail the other day... the craftmanship on this is top notch... My first boat and I can wait to have it up and running... will post pics when its running... Thanks again Brian for a wonderful first boat...
Tj

[befu]

I got mine in the mail the other day... the craftmanship on this is top notch... My first boat and I can wait to have it up and running... will post pics when its running... Thanks again Brian for a wonderful first boat...
Tj

glad you like it. I only wish it had been good enough that you can't wait to have it up and running! Or is that what you meant?

Glad you like it, good luck and ask any questions you might have.

brian