Barrel Back….

[Paul TParticipant @pault84577]

Hi Ashley

 

Perhaps a driver might be found in the shape of Barbie & Ken, I did have a play with some huge 3 phase brushless motors at Birchwood but at £56 each they are a little beyond my reach.

 

Hello David

 

The plan is to apply 20 coats of varnish which is easy to do the only problem is the wet & dry rub down between each coat so the model will be shelved for a while whilst I recover.

 

The workshop is now not only a mess but covered in a deep layer of mahogany dust from cutting all of those planks. So if you fancy another dig bring your spade over here and dig out my bench saw.

 

Paul

[David MeierParticipant @davidmeier28154]

Hi Paul. I would love to come over and give you a hand. As I cant afford the air fairs I’ll have to work on my distance swimming, at the moment I only have a 5 yards and water skills certificate.

David.

[Paul TParticipant @pault84577]

These are the drawings for the barrel back, sorry about the quality but the transfer to jpeg format has upset the system.

 

Paul

[Bob Abell 2Participant @bobabell2]

Mornin` Paul

 

We had a talk last night ,at the Etherow club, about Barrel Backs and Brushless motors.

 

Did you know………………..On brushless motors………….the armature shaft is bolted to the hull and the motor casing revolves????????………………..I was gobsmacked!

 

………….and special controllers are required……………….and sound units won`t work with the motor as normally?

 

Bob

[Dr John BoothParticipant @drjohnbooth43899]

Hi Paul

Glad that you are feeling a little better, I like the blueprint it a very professional drawing its a shame the transfer of formats has reduced the resolution.

Have you thought of selling your design to the greater public rather than giving it away to website members? 

Bob

Perhaps when Paul is feeling better you might like to ask him to visit your club and talk about his barrel back build. I am sure that the combination of Paul, Ducky and yourself would make an excellent evenings entertainment.

John

[Bob Abell 2Participant @bobabell2]

That`s a splendid idea, John!

 

………..And what an impressive model too!……………..What do you think about that Paul?

 

We`ve got a gang of speedboat fanatix in our club!

 

Bob

[Paul TParticipant @pault84577]

Hello Bob

 

Yes I knew about the brushless motors but not before making a fool of myself at Birchwood by trying to make one spin.

I would love to visit Etherow but just to sail the boat as I am the worst public speaker and I don’t think I could stand the booing and derisive comments from Dr Bob.

 

If I am going to sail at Etherow, which has a super lake, I might just fit the IC unit as this is a venue where I could really open the taps.

 

Do you think that the ducks will mind and can I keep the ones that I hit?

 

Hello John

 

No I don’t want to get into the business of selling model boat plans mainly because I just can’t be bothered and I don’t think that our web hosts would be to happy about it.

 

Paul

[Bob Abell 2Participant @bobabell2]

Hello Paul 

 

You would be welcome to sail at Etherow, but sorry!……………No IC allowed

 

Why don`t you offer  the Barrel Back plan to the Modelboats Magazine………..eventually?……….When the model proves to be a howling success!

 

Just another good idea……………..Bob

[David MeierParticipant @davidmeier28154]

Good evening………………. Bob. I am not sure if your comments about brushless motors are a wind-up, it is a bit hard for me to judge, what with your accent and all. 

I have just fitted a couple of brushless motors to a boat to replace the 380 type motors that were in it. The brushless motors are 3 phase motors so have 3 wires comming from the case of the motor. You swap any two wires to change the shaft direction. I am useing Hextronic electronic speed controllers to run the motors. I must confess the technology and the programming of the speed controllers is a bit daunting for me and I am getting a hand from a chap on the weekend with it.

Cheers.

David.

[Paul TParticipant @pault84577]

Does anybody know what speed the Ripmax 12v hand held aircraft starter motor runs at and what the average power draw is?

 

I would do the tests myself but I am barred from my workshop.

 

Paul

[Bob Abell 2Participant @bobabell2]

Hey Paul

 

How about ganging up four chunky motors driving a chunky prop that can flatten a 12volt jelly in no time!

 

Just an outrageous suggestion…………..Bob

[Paul TParticipant @pault84577]

Bob

 

Just one chunky motor will do but I doubt that any electric unit will be man enough to push the boat along at a decent pace.

Can you suggest one….seeing that you won’t let me use a proper engine.

 

Paul

[Bob Abell 2Participant @bobabell2]

How about any chunky motor………………….but a Yuppi`s ghetto blaster sound system with the v8 sound unit?………………and some smoke for effect?

 

Just thinking out loud!……………Bob

[Bob Abell 2Participant @bobabell2]

The idea of four motors driving a layshaft, driving the prop shaft has it`s attractions!

 

You could trip each motor in turn and get a sort of variable speed…….would it work?

 

Still thinking out loud old chap!…….Bob

[Colin BishopModerator @colinbishop34627]

The motors would have to be clutched in and out presumably otherwise the freewheeling ones would act as dynamos and add drag?

 

Colin

[Bob Abell 2Participant @bobabell2]

Colin

 

The free wheeling ones would create the necessary drag, and they would act as a creep speed, but when all motors are powered, hopefully the boat should fly!…….eh?

 

The idea of four motors driving one propeller sounds a possibillity

 

I saw a multi motor setup somewhere, where all the motors where in line…shaft to shaft………now where did I see that?

 

Still thinking out loud…………….but food for thought?

 

Bob

[Paul TParticipant @pault84577]

Bob

You have set me thinking about a multi engine setup, but I don’t think that having them all “in line” would work without a series of clutches.

I also think that Colin is right about idling motors acting as brakes and generating power that might just upset the esc.

But I have come up with a solution that might work.

If I position the motors at equidistant points around the shaft i.e. north, south, east, west and then connect them via gears to the shaft then it might just work.

What do you think?

This is a basic end on sketch of what I’m thinking about

Paul

[Dave MilbournParticipant @davemilbourn48782]

Check your E-mail, TFC.

I’m currently trying to get a photo of the item in question onto the Forum – great fun!

DM

 

Ah HA!

Done it.

[Paul TParticipant @pault84577]

Hi Dave

 

Thanks for the email.

 

They are meaty and mean motors with loads of power, I do fancy running 3 of the 4:1s at 24 -32v they would really make the barrel back shift but I would have to sell the Trent to pay for them.

 

Far better than my multi motor idea and almost as good as the strimmer engine.

 

Real food for thought.

 

Look at this http://www.youtube.com/watch?v=KRcDsCpqidY your mate Johns boat powered by 2 of these mighty motors

 

Paul

[Dave MilbournParticipant @davemilbourn48782]

Blimey!  He told me it was a bit quick, but…………

I wouldn’t want to be a duck on that pond.

Dave

[Paul TParticipant @pault84577]

Some more progress photos

 

 

I’ve still not finished the rear hatch cover

 

 

Stern view: still lots of work to do on the woodwork

 

This view shows the diagonal planking and the start of the leather interior.

 

Long shot of the planking

 

Paul

[Colin BishopModerator @colinbishop34627]

That is looking really nice Paul.

 

Are you allowed to go near it yet?

 

Colin

[Bob Abell 2Participant @bobabell2]

Looking good Paul

 

How will you make the shiny metal fittings?

 

You could cast your own?……………..There used to be a firm that produced lead type soldiers from latex rubber moulds at a very low temperature. It was called…Prince August” or something like that………………..worth a look?

 

Bob

[Paul TParticipant @pault84577]

Hello Colin

 

I am still under strict orders not to go near the workshop….so that rules out all of the tools except a pair of scissors.

 

So I am passing my time fitting the leather interior to the cockpit and wondering how I am going to make this beast do anything more than drift slowly across the lake.

As you will have seen from other posts I have given up on fitting a petrol engine and I am reduced to making do with electric…..the problem is that the estimated total “all up weight” is 35kg which is a tall order for an electric power plant.

 

Still it could be worse.

 

Thanks for the kind words

 

Paul

[Paul TParticipant @pault84577]

Bob

 

I have no idea how I am going to make or find the chrome fittings to complete this model.

Casting my own out of lead is a good idea but the metal is a little soft so I might try casting pewter, thanks for the pointer I shall look on the interweb later.

 

Paul

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