I bought this boat in reasonable condition five years ago from an estate sale. The original geared 540 brushed motors were rusted beyond repair, so I replaced them with a pair of 2830 1000kv brushless motors, running off a pair of 6 cell NiMH packs.
I use a transmitter mix to allow the model to rotate on the spot and perform scale-like docking manoeuvres.
That's a nice bit of video. she runs well.
I have a Krick Outboard but still haven't decided as to what I am going to put it on yet. I have also got a Graupner Rhode Island F1 Tunnel Hull that has a brushless outboard on it but not had a chance to run it yet.
The Juliana II - a Hampden plank-on-frame Schooner
This was my very first RC project. In fact, it was only to be a static model, but then things changed.
Currently she's a shelf-queen as the rigging takes a while.
She can be converted to a fishing boat and fitted with a 5 blade 42mm prop and brushed 540 motor.
The sail rudder is larger and requires the prop to be removed.
Haven't tried hard turns and full throttle yet (usually 1/2 is plenty) so though I'd take the boat out and chuck it round a bit. Didn't fall over, so passed the test. More than enough go for 'sensible' use,- could even afford to de-power it a bit. Not too bad for brushed motors.
Wonder why they were also called speedboats JB ? Looks just the part ! Great stuff - fast enough to make the passengers nervous - hope the one does not lose her head again......
Sun was out, wind was down, so took the boat for swimming lessons. Went very well, no problems other than the silicone couplings trying to screw themselves off as usual, (too much bite and torque) and bunching up to the motor causing friction), (have a possible fix I'm working on for that today) Heaps of power from the 2 - 540 HV brushed motors only running on 3s. Never went much more than a tad past 1/2 throttle which was spot on scale wise.
Very quiet as well, - mind you, couldn't hear much anyhow with a road milling machine working at the end of the pond about 150m away, at around 80db where I was!!😠😠😠😭 Of course it would have to be there today,! something like this always stuffs my plans up, cars, trucks, screeching seagulls, people talking to you while you are trying to make a nice quiet video etc etc. Can't seem to get away from noise. Added to that, the video's crap,- as soon as it uploads to YT it turns to rubbish,- was quite acceptable till then.
Must be the wide format they use, as it's fine in a small screen (ie YT preview) and my computer. Worst thing is, it took an hour to load this rubbish on a fibre connection!! Not loading any more till I get a better camera, "Santa, did you hear that ?"😁
I might de-power it a bit, as it has too much power really,- might put 2 540 45T motors in which will run on 2s nicely with 30mm props (has 35s at the moment) and not be as touchy on the throttle. You can steer this just using the throttles it's so bitey. Spins on the spot like a jet boat as well. Stereo worked well, but the IR remote doesn't like working too far away in bright sunlight, (have a separate vid, but YT would give a copyright warning, so I won't put that up) The vid is garbage, but you'll get the idea😁
Hello JB!
Congratulations, also on your idea with the sack truck, which I am taking the liberty of copying. . .
Just awesome your ideas here on this homepage!
Greetings Mike
Scratch built motor gun boat from Bangladesh.
Tried my best to upgrade it into a brushless one. First attempt was brushed and it was kind of a pain in the ass.
It runs far better now.
Fitted the new 550 45T brushed motor as a replacement for the ancient and slow 70s Graupner monoperm. Goes a lot better now and has a decent speed range. Handles and rides quite well for a skinny boat. Prop is a Graupner 40mm 2 blade (don't know the pitch, -fairly fine) Using a 2200mAh 2S LiPo battery which probably gives around an hours running slowly, or 30 mins of hooning around.
Battery was only charged to 8.25v and ended up at 7.7v. (45%) after about 3/4 hr. I'll probably fit a Hobbywing ESC as well, for a bit better reverse action, as the El cheapo car one is a bit slow finding reverse at times.
Set the new Surpass 3000KV 36 diam finned in-runner up in the boat, and did a tank test. Lots more power than the HV brushed 1200kv 550, but with higher idle. Re-did the reinforced silicone coupling and fitted a small collar to the inner end of the motor shaft to hold the tube from moving forward against the motor, as with the extra torque of the in-runner, it was trying to twist the tube off the shafts. Seems to be hanging in there static which is a promising sign. Once running, the load will come off which should help.
Runs full at around 4A and the battery holds at around 3.8v/ cell )alarm is set at 3.6 for safety, (as a sort of rev limiter) performance should improve a bit now. Have to wait till tomorrow as the restrictions end at 6am Sunday, (then have to hope for good weather for the test) The prop in the jet is a 28mm 3 blade racing prop which I modified to fit. Don't think I'm going to get much more out of the jet unit without it exploding😁, (it's only plastic I think, not GRP), - might have to buy a back-up and fit it with better quality bearings etc. If the jet was in the usual 'plastic' 24" toys it would be a rocket, but it's pushing 6lbs which is a challenge😀
Note the police chase outside in the background😁- always action around here, lots of hoons in cars😁
Just built Krick RO-Marin Neptun. First tug I’ve built, she came out okay, I think. 6volt system, MFA 2.5 geared motor, Graupner SXM switch controlling the lights, older Pixie brushed esc controlling water monitor pump. Old Futaba MC210 for motor esc, Frysky QX7 radio. This video was shot at Towne Lake, McKinney Texas. She well on her maiden, needs about 2-4 ounces ballast in the stern though.
