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292 posts · Page 7 of 25see you next month.
Built from a Glassfibre hull, brought on Ebay for £35 the hull is a slim mono racing type with a self-righting side cabin it runs a 1400W 14V 2958 4200KV Brushless Motor and 29-S Water Cooling Jacket with additional air cooling fan.
I did not want to use a flexi drive as high maintenance and prone to failure so the shaft runs via two universal joint one at each end. the propeller is a 38mm copper alloy
The ESC is a 200W and water cooled the twin rudders supply separate water one for the motor and one for the ESC.
The rudder are positioned to reduce prop-walk and are hinged to prevent damage if you hit a object in the water and also for ride adjustment.
Turn fins and trim tabs for ride adjustment were provided by a spares kit for another boat. also foamed and added an inner sealed hatch, a rubber bump strip and safety loop.
To my surprise at home I found that it had a Bullet 30 motor installed these motors were the top drawer motor of early fast electrics in the early 1980's and its the only one I've ever seen, it can run on 24v and pull around 15A giving 300w not bad for a brushed motor.
due to the power of this motor I have modified the hull under the water line with turn fins and trim tabs to reduce torque roll and improve turning stability, the underside is incorrect already as it only has one propshaft, where the original had two and I believe that both props turned in the same direction.
The Pictures here show some of the work in progress I have remounted the motor and added a speed controller rated at 24v
I have remade the stern compartment and rudder gear under it.
I have blocked windows and foamed the front half of the boat.
made missing parts and repaired delaminating ply.
Note old ply is not as good as modern, the glue is not as water resistant.
Have painted the hull and have just ordered the decals from Cornwall model Boats :-https://www.cornwallmodelboats.co.uk/cgi-bin/sh000001.pl?WD=hose%20fire&PN=becc_fire_tender%2ehtml#aB_2dFTS1_2e32
The 34in is 1/16 scale
Fitting can be brought but many are cast white metal and can add weight to the boat, I have made two water cannons and plan to buy plastic fittings from this site.
This has turned out to be a task that is difficult to assess how much effort and money to spend on a hull that has been built by someone else (say no more).
Have just finished the steps for the stern compartment.
Painted and now for the test run.
the Bullet 30 motor ran well between 14 and 18v,
This Proboat PT 109 model was brought in 2013 for £100 these boats are rare now, This one had a few faults with the propshafts they were bent and noisy both were replaced, with quality 4mm shafts, motors twin 600s were also replaced by Graupner versions along with mounts and couplings, basically all the running gear, also two ESCs by Aquapower were added and a 2.4G RC system.
Whats a CB90
Its a Command Boat 90 originally built by Docstar in sweden and later also built in the USA under licence.
The boat has a multi role capability and has be used by the Army, Police, Coast Guard and Ambalence Service
Originally a Military craft for coastal waters and rivers with a shallow draft and powered by twin water jets this 15 ton Aluminum boat can deliver half a platoon directly on to beach heads via its landing craft type single man door at the bow.
This craft has excellent manoveraility and can crash stop ( go into full reverse and stop) in 1.5 x its length. No-wonder the american's wanted this boat.
Video of real boat
The motors are 900 Kv with 80 amp Escs the lift fan is a 7 blade ducted fan, the thrust prop is a 12in x7in cut down to 10in.
Battery is 14.8v 5000Ma.
- Dave MVice AdmiralOne of our members used a couple of old drone bits to make a twin prop version with steerable nozzles. Worked OK but very twitch as only a small craft like yours and the motors were powerful.Liked by Martin555 and RNinMunich
- RNinMunichFleet AdmiralFunny that! I was just considering the same mod 😉
Think I'll try it first 'as is' before I start experimenting.
Cheers Doug 😎
385 motor, 35mm 4 bladed brass prop, 6v battery, featuring sound unit and working lights on 3 circuits,
Built from Scrap, about the Same Size as a billings Nordkap, but a lot Cheaper😊
I have used a 2208 brushless with a chopped down 10" prop, cheap 10amp ESC and 11.1v 2200Ma Lipo.
Good when the weed gets too bad!
Realistic in operation. Looking a bit work worn now. Could do with up-dating with Lipo batteries which would make it even lighter. Seen here with lift motor running with skirt inflated. Steering
interesting, with twin air rudders. Must get some videos of the action.
- RNinMunichFleet AdmiralNice one Krampus👍, love the crew 😉 There's much better beer in Bavaria though! 😲 Cheers Doug 😎Liked by figtree7nts and Krampus
She is based on a Robert Allen tug built in Cyprus.
She has two 800 motors on belt drive with 70 mm props.
- RNinMunichFleet AdmiralActually I knew it was Andy 😉
Just another example of my usual pathetic attempt at humour😁
Wonder if John has since made a vid of her Sea Trials?
Or is she just 'TOOO Nice' to risk in the wet stuff 🤔
Cheers, Doug 😎