dadandlad

Hi Guys
New to the forum and weed powered boats so please feel free to add your input.
Im planning on building a scale model of Miss Britain 3 from Traplet drawing No MAR2752 which i will be doubling in size to give a OAL of 55 inch x 16 inch beam
Due to the fact that the boat has a very shallow draft at the front i will need to place the engine just behind the cockpit opening and plan to have a drive shaft running towards the front of the boat and through a gearbox in the front end which will in turn drive the propshaft at the correct angle.
I may have to lay the engine over to fit under the superstructure will this cause any problems with running?
Im planning on using a 23cc unit
Can you see any major pitfalls at the moment before i commit money to the project
Cheers Mark

advanced builder

I see it but i'm having a hard time. kinda what-is-it.Ive seen nitro engines on it's side. tether cars .23cc I'm not sure An airplane engine runs upside down.
looks more like a rocket 50dies style . any more pics

glennb2006

I think you are probably adding complexity that is not needed in the model by using a gearbox etc. Most likely there will be room to accomodate the motor in a more conventional way, guess you need submerged drive to stay true to the scale?

If not, then surface drive is your asnwer and will be easy to fit out.

Glenn

carprigger38

My Feedback: (6)

Got any better pics of the boat?

dadandlad

Hope you can make out these a bit better,the first picture i posted is from the side and you can see the long shallow angle that the propshaft takes,also note the forward mounted rudder which is going to be rarther interesting.
Here is a bit of its history for you


Miss Britain III is a racing power boat designed and built by Hubert Scott-Paine, a British aircraft and boat designer.

During 1932 Hubert Scott-Paine, owner of the British Power Boat Company and already a noted power boat racer, asked Rolls-Royce for a (2,500 hp) Rolls-Royce 'R' engine which had powered the winning Supermarine S6B entrant in the 1931 Schneider Trophy challenge. He was planning a single-engined challenge to Garfield 'Gar' Wood who held the Harmsworth Trophy with his Miss America X speedboat, a monster of 38ft (12 m) with 4 engines totalling 7,800 horsepower. No engine was then available so there the matter rested.

In February 1933, with the success of his Power-Napier engine to which he had exclusive rights, Scott-Paine issued his challenge for the Harmsworth Trophy. Within a period of less than ten weeks he had designed and built Miss Britain III in conditions of great secrecy at his Hythe workshops. The result was revolutionary, with stringers of metal-reinforced wood and aluminium cladding, a single 1,350horsepower (1,010 kW) Napier Lion VIID engine, and a length of only 24-foot-6-inch (7.47 m) The attention to detail is evident in the thousands of duralumin countersunk screws with the slots all in line with the water or air flow. George Selman, one of the country's leading propellor experts, designed a new propellor after the existing designs proved unsatisfactory. Testing was carried out in great secrecy on Southampton Water in the early dawn.

The team sailed for America in August 1933 and the contest was held on the St. Clair River at Algonac, Michigan on 4 September. The David and Goliath contest was very closely fought but Gar Wood managed to win by a small margin - average speed 86.937mph (139.912 km/h) against 85.789. Scott-Paine returned to Britain to a hero's welcome.

Following a fire on board which was quickly put out and the boat repaired, a record breaking attempt was made on 16 November 1933 on Southampton Water. Scott-Paine and Gordon Thomas became the first men to travel at over 100mph (160 km/h) in a single-engined boat, and this record remained for 50 years.

Miss Britain III was taken to Venice in 1934 where Scott-Paine won both the Prince of Piedmont's Cup and the Count Volpi Trophy, setting a world record for a single-engined boat of 110.1mph (177.2 km/h) in salt water.

In 1951 Scott-Paine presented Miss Britain III to the National Maritime Museum where it remains on view.

exotica

...now thats some history and a cool looking boat. Ill be watching this build.

bentoad1

You can run a weed eater with a pumper carb at any angle . make sure you have good air flow and acces to adjusters pro boat makes an exhaust water cooler horizon hobby part# PRB2661 $15.95

carprigger38

My Feedback: (6)

Very interesting design! Are you going to do it in alu or wood?

warbirdmustang

My Feedback: (21)

Very cool, I'm subscribed.

dadandlad

Cheers chaps
Would love to build in alluminium but im afraid i just do not have the skills to weld it,so inital thoughts are to build from wood and either coat with something like solarfilm or possibly litho plate.Litho plate is my prefferd method at the moment (litho plate is a extremley thin alluminium plate used in the printing industry).
Well the plans are ordered and will hopefully be here Friday and the first job will be to get them blown upto double size.

Just one question what size servo do you boys use to operate the throttle

bentoad1

I PERSONALLY WOULD NOT USE ANY THING LESS THAN 150 IN OZ. TORQUE. IF YOU DON'T HAVE THE TORQUE TO TURN IT WILL GO STRAIGHT UNTIL THE RUDDER UNLOADS THEN IT WILL OVER STEER. BIGGER AND FASTER NEEDS MORE TORQUE. GOOD LUCK
SORRY THIS IS A STEERING SERVO . THROTTLE DOES NOT TAKE AS MUCH TORQUE. CABLE LENGTH AND FRICTION WILL DETERMIN WHAT TO USE

KENDOG689

Love the the old stuff!!!!Hyperformance has a v-drive that will work for you.That is one cool boat.

warbirdmustang

My Feedback: (21)

A standard servo will work fine for throttle, especially if you unhook the spring from the throttle arm on the carb( that's the way we do it with planes). Steering servo needs to be about as big as you can afford, as mentioned above. I've got a Hitec 645MG servo on the rudder of my Easy Vee, I hope it's enough. Check out using a product called flite metal over fiberglass( you could fiberglass the wood hull with resin and 3/4 ounce cloth and sand to a smooth surface) or you may also want to look at aluminum air conditioning duct tape. Very pretty boat, can't wait to see the model!

dadandlad

Well thanks for the replys and advice regarding steering and throttle servos

The drawings have finally arrived and after having a measureup i have a maximum of 8 inches from the top of the keel to the underside of the cockpit cowl, not much room i know but i think with a bitof messing around i can get the engine in.

Hopefully the engine i have been given willappear tomorrow so i can start thereal planning.

First thoughts with the engine are to water cool it due to being fully enclosed,Gas/glow conversion which should allow it to run a little cooler but also cuts down on overall height and hopefully provide a little more power

Seriously thinking about keeping the clutch so asonce warmed up the boat can be placed into the waterand thenpower applied to pull away

bentoad1

Looks like fun. I ran across a former emoloyee of Regal Boats and he sold me a 1989-90 REGAL VELOSITY sales sample bare hull he never started. I modified the transom because the dive platform would have taken on water in a folowing sea. I used an echo ec 2100 weed eater motor. here are pics and maiden video

http://www.youtube.com/watch?v=YruUv2i6HuI

dadandlad

Nice model bentoad1 looks plenty quick enough for me and my old timer reaction speeds

Well the engine turned up today and is not much use at all half the bits missing and it did not lend itself to conversion at all so the search continues for a suitable donor, flea bay here we come

bentoad1

If you can find a toro , stil,or a echo weed eater with bearings on both sides of the crank shaft it will last longer. some of the cheep models have only one main bearing on one side. one with a clutch lets it idle better. it knocks off a little on top end but if you are not racing it doesn't matter much. I picked up this hull that had a burn't moter and had caught on fire. I found a toro 26cc 4 bolt main . used a exhust water coloer( sent a clip earlier) I madew a expansion chambr and a walbro wt644 upgrade carb this boat is about 9 or 10 years old made in coco, fl by express craft.
http://www.youtube.com/watch?v=KtwNoNlaGfU

I bought this mosquito craft at good will for $4.50 and wound my own motor. it uses lipo batteries and I made a water cooler for the motor and data logging speed control. it does 100 yds in 2.8 sec it draws 171 amps at 45.000 plus rpms
http://www.youtube.com/watch?v=Bj-8Z..._order&list=UL

dadandlad

Had a Mcculloch chainsaw given today which had seized,turned out a fuel tank bolt had come loose and jammed in the flywheel so i now have a engine
Quite a nice compact unit which will fit under the superstructure and the bonus of being 39cc
The engine has a two bearing 4 bolt mains crank and needle roller small and big end so should be plenty strong enough
With it coming from a chainsaw it has a output shaft at either end of the engine one for the magneto and one for the clutch
The clutch is going to take a little thinking about to set up as the clutch bell is the opposite way to what you would expect i:e it drives at the rear of the clutch bell rarther than out the front as you would expect ifyou get what i mean (may have to post a pic or two)

I have a question for you,viewed from the rear of the boat which way does the prop turn

advanced builder

I really don't post a personal site but the site seams safe. http://testfly.0catch.com/rc-model/rc-boats.html

samuelmerry

Any news on this build? sounded interesting.....