Testing under water video with Gopro Hero 3. Submarine R39 belongs to BMBC member Paul.

Well she was billed as the "Spitfire of the seas" in 1959.
Roger

I've replaced the old 6v sealed wet battery with a lipo 3s,11.1 volt 2200mhz, 100c spectrum smart battery. so the 1st run was cautious i just fired up the centre prop to see how she performed, well i was surprised at the turn of speed she had on just 1 prop, and how well she planed, it was a little awkward filming and controlling the boat by myself as i was the only one pond side. this was not without mishaps though, see 2nd video
After checking the boat over she was found to be unmarked and no bits missing, not bad to say she hit the pontoon at full speed, took off and plunged back in at the other side.
So the second run i started on the centre prop and then opened her up on the outer 2, she shot forward and immediately stalled, dead in the water. luckily i could reach her with the ponds barge pole to pull her to the side. i found the fuse had blown , i had fitted a 20amp mini flat fuse, i didn't have a 30amp only another 20amp which blew just as quick, upon opening up the outer props.
any ideas anyone or will a 30amp do the job, or a 2s battery? help any suggestions considered.
Roger

Part 1. ideal conditions; nearly 30°C, cool Bier at hand😜
Sea Scout built by Dad in the early sixties with a Taycol Target and 6V lead acid wet cells (very wet😡). Renovated and dragged into the 21st century over the last several months 😉
See Build Blog 'Sea Scout 'Jessica'' for details!
Motor: Propdrive 2830, 1000kV, 30mm 3 blade Raboesch prop. Quicrun 16BL30 (30A) ESC with BEC.
Tested with 3 battery types, all started with 99% measured capacity-
1. NiMh 4.2Ah 7.2V, nom. 408gm.
Result: Speed sedate (OK 😉scale river cruising!) No planing.
Max current: 3.6A
End status V / capacity left: At end of short run ca 3 mins. 7.78V 99%.
2. 2S LiPo 4.0Ah 7.4V nom. 257gm.
Result: Speed still sedate but due to lower batt weight at least the forefoot came out of the wet stuff! Max current: 4.1A
End status V / capacity left: At end of short run ca 3 mins. 8.25V 93%.
3. 3S LiPo 4.0Ah 11.1V nom. 315gm.
Result: Now we're getting somewhere!!😁
Good speed, manoeuvrability and planing 😊 Max current: 7.5A
End status: 11.95V 74% after several long runs, ca 20 mins total.
Estimated (extrapolated) endurance on a 4Ah LiPo around one hour - mostly 'full bore' - 'Pedal to the metal man' 😊

See also:

The competition!

Final run. (Beer was getting warm😁)

Cap'ns log entry:
Boat dead-weight w/o battery: 1.8kg.
Spray rails to be added!😲
Slight list to port to be trimmed.
Rudder servo to be reversed!!😲
Keel protection to be added: some scratches and flaking from stony sloping shore 🤔
Summary: much as expected👍 Forget anything less than 3S.
Anyone want to buy a batch (4) of new 2S 4Ah 45C Lipos? 'One careful owner'!
Happy boating people, Cheers Doug 😎
PS Many thanks to Camera girl Gisela 👍
Recorded in 1080p HD.

well finally got there. she sits a little low in the water, but evenly along the water line. this was with the battery central to the hull. when powered up the centre screw alone moved her quite serenely and was very manoeuvrable. when power was added to the outer screws I would say she didn't plane well as she wasn't going fast enough. even with all props on full power, I think also she is to heavy and the battery too far forward.
So to remedy this I moved the battery back a compartment, positioning it over the 3 motors , it was a tight squeeze, but fitted just.
This sat the stern down a little and the bow up and gave the impression of planeing, she still not fast enough though. the scale speed still doesn't look right.
I'm going to have to have a rethink on this one. having said all this though she looked well in the water if i say so my self.
Roger

As requested some internal photos, not as neat as I would like but I'm still at the "may change things stage".
Roger

Finally finished, well if you can ever be, there is always something to add or change or maybe improve, I'm happy with her, for now anyway. Thanks to R.H.Baker for his help and inspiration over the last year. also to everyone who contributes to this site, it is surprising how much can be learned by reading other peoples messages.
Thanks to everyone.
Now to the next project on the slipway
Regards Roger

I built this model during four long years. my Lulonga is nearly whole scratchbuilt model (about 75 cm long) except the steering wheel and position lamps.
The model has a plywood and balsa hull construction ,plywood decks,from hard polystyrene sheets made superstructure,laminated with veneer. Sidewheels with skew paddles, two DC 12V independent electric motors with gearboxes controlled by ESC. Electric LED lights, steam sound module, sirene and horn.Tx/Rx 6 channel HK 2,4GHz.
completion expected in spring 2014
More infos about building you find at > www.paddleducks.co.uk <

some videos are here at Model Boats too >
http://mdlbt.com/19852

wiring diagram you can see here in my albums
http://tomarack.rajce.idnes.cz/RC_model_Lulonga#lulongaelschema1.jpg

Short vid of 2nd handbrake test with a 3kg load (simulating boat) works well, vehicle pulls it up the ramp no trouble, (end cut as cam batt ran out)

I wanted to try the driveshaft brake I'd recently fitted and thought I might as well do it on an actual ramp. This ramp has around a 30deg slope so it was a good spot for a test. Tried it with just the trailer first, (don't want my boat model disappearing down the ramp at high speed) and it worked well. I've done another vid where I but a 3kg water bottle on the trailer to simulate the weight of the boat, and that also worked well (although it's a bit scary when 13lbs starts rolling down the ramp backwards.

Lost the trailer a few times going over a big join in the ramp ( forgot the tow ball lock nut) so had a few goes to get it right. I was surprised how well a piece of string round the driveshaft could hold that weight so easily. Only negative is that it's not as good in forward, (would need another wound the opposite hand on the shaft) but that's not as important as reverse control. Still waiting for the weather and tides so I can try another launch. This ramp's not bad, but a little rough !

Ontario Premier Doug Ford's cabinet has approved a provincewide stay-at-home order and will close non-essential retail stores for all but curbside pickup, multiple sources told CBC News Tuesday night.

The move comes in the wake of criticism that restrictions announced last week — what the government called "emergency brake" measures — are insufficient to slow the spread of Ontario's third wave of COVID-19.

The Ministry of Health reported another 3,215 cases of the illness Wednesday morning, the most on a single day since Jan. 17, when the second wave was at its peak in the province. Health units also logged 17 more deaths of people with COVID-19, pushing the official toll to 7,475.

The seven-day average of daily cases has climbed to 2,988, its highest point since January 18.

The upward trend in new infections comes as the province logged a record-high day for vaccinations, with 104,382 doses administered yesterday, according to the ministry.

RC Sailing No.118 - Out of Lockdown ! . 4th April 2021
Forgot my gloves ! - Forgot to charge the boat ! - Forgot how to set Gopro ! - at least we got a few clips of video - out of lockdown al last !.
Nice to see Bill & Ben back sculling on the Pavilion Gardens in Buxton !.