Barrel Back….

[Paul TParticipant @pault84577]

Bob

 

At the moment it floats high and draws just 5mm with the motor and batteries added it draws 8mm which is just not deep enough.

 

Paul

[Phil Winks 1Participant @philwinks1]

Paul thats a lovely lump of a motor. I’ve posted some thoughts on your ballast tank Idea on my build thread a thought that occured to me was model aircraft fuel tanks although I guess boat fuel tanks must be similar and one of these pumps to fill and empty them they mostly will run either way so the pump  could be permanently plumbed in with a 3 posn toggle switch to fill/empty

[Paul TParticipant @pault84577]

I have done a little more work on the motor and gearbox

I need to build a casing to protect the gears/chains and to contain the lubricant but you get the general idea.

 

And as Phil has announced what his next launch will be I have decided to build a slipper stern.

Lots more varnish….

 

Paul

[ashley needhamParticipant @ashleyneedham69188]

Paul. Is that chain man enough? it is not proper transmission chain is it? I thinki I have seen that stuff as adverrtised ” when more power needs to be transmitted” but thats a powerful motor you have there….cant you get belts or is that too expensive

[Paul TParticipant @pault84577]

Hi Ashley

 

The chain is the standard meccano item and is quite strong.

I have test run the setup for a short while without any problems apart from a little chain stretch but of course there was no prop load so I will have to simulate this with some shaft brakes.

I wanted to use chain to give the model some mechanical noise instead of using a sound generator.

 

Paul 

[Phil Winks 1Participant @philwinks1]

Having run some static tests on my previous boat I found that once the prop has got the water moving it unloads considerably so, correct me if I’m wrong, but if you don’t whack the throttle straight to full a loaded prop draws not a lot more power than an unloaded one (approx 20% according to my limited observations on a small prop) so given scale like handling that chain should handle the power reasonably well IMHO

[Paul TParticipant @pault84577]

I’m more bothered about the power of the motor stripping the threads inside sprockets as they are only brass.

 

[Phil Winks 1Participant @philwinks1]

Hi Paul seems you have a knack of picking launches that I rode in as a youngster lol the slipper back was the one we used to get at reading if their 2 barrelbacks where both out or if Dad was feeling the pinch I think as likely as not the slipper would’ve been a cheaper hire rate. Bet you don’t do it next time though unless you go for a mirror dinghy or canoe lol  I think from pics I saw on here there is still a slipper moored in reading maybe its a restoration project.

[Paul TParticipant @pault84577]

Hi Phil

 

Odd that you should mention the mirror dinghy as I was going through some old photos this afternoon and came across some of the mirror dinghy that I built when I was still at school.

The reason for wanting to build the slipper is that it is the typical english river launch and because I have a stock of maple that will make a great hit and miss deck with mahogany.

 

Paul

[Paul TParticipant @pault84577]

A few more update photos, not much progress over the past two weeks.

 

Transom showing brass letters and exhaust ports

 

Long shot of the tramsom

 

Brass letters on dashboard

 

The motor and gears are designed to be removable to reduce the weight during transport….the two brass pipes are the pushfit connectors for the cooling coil and the power push fits are on the other side.

 

Top view of swim platform.(not finished)

 

Bottom view of swim platform (when not in use the platform will be hinged up against the transom)

 

Paul

 

 

[Bob Abell 2Participant @bobabell2]

Very nice Paul

 

A few shiney handrails would look nice around the cockpits?

 

Lady Jane looks correct and also…Barrel Back……

 

 

………………….Can`t see the jolly old 12″ rule though!

 

 

Bob

[Paul TParticipant @pault84577]

Sorry Bob my mind is all over the place.

Hope that this 2ft rule meets with your approval

 

Paul

[Bob Abell 2Participant @bobabell2]

WOW!………………Is that a TWO foot rule?

 

How impressive!………………..I see the old sewing machine stand there!…………That`s a good item for getting an impression of size?

 

You`re going to need a pretty powerful motor old son!

 

How about a picture with a homo sapien alongside?

 

Very nice………………….Bob

[Paul TParticipant @pault84577]

Glad you like it Bob

 

I used my latest toy to cut out the brass letters.

 

I do have 12 inches but I dont use it as a rule but you do get a good impression of size from the 4ft sewing machine stand.

 

Paul

Edited By The Fat Controller on 25/05/2009 16:40:14

[Phil Winks 1Participant @philwinks1]

Do you know paul I had it in my mind that your barrel back was 1.5m seems a good bit bigger to me. On the question of which our boats will look the better on or of the water you have the lead by a country mile old chap

[Paul TParticipant @pault84577]

Hi Phil

 

It is 1.5m ……I have just been having some fun with Bob.

 

I dont know when I will get it on the water though as I keep having little health setbacks.

 

Paul

[Bob Abell 2Participant @bobabell2]

Well!……………….You little Tinker!

 

I fell for that one, all right…………Hook, Line and Sinker!……………….lol

 

Look after yourself, my M8!

 

Bob

[Phil Winks 1Participant @philwinks1]

 Nice one Paul I fell for it too. sorry to hear about your health mate  take care and once again sterling job your doing on the barrelback.

[Dr John BoothParticipant @drjohnbooth43899]

Paul

 

At 1.5m (just under 5ft) I presume your model is a 1:6 scale version of a 30ft launch and as such I would like to know if anybody else has built at this scale.

 

If any members can answer this question and, better still, provide photos I would be most grateful

 

John

[Paul TParticipant @pault84577]

John

 

Yes it is an approx 1:6,

The primary reason for building at this scale was that I designed the boat around the engine…but I do like building large scale models.

I have seen some large scale models such as aircraft carriers but I don’t know of any model at 1:6 (even though there must be some)

 

I am fed up at the moment..its a great summer day and I am confined to the sofa unable to do any work on the barrel back, I will never get it finished for Birchwood.

 

Paul

[Phil Winks 1Participant @philwinks1]

Really sorry to hear that your health aint so good at min Paul. Here’s hoping it improves soon. I take it Birchwood is one of the big shows in your part of the world. that reminds me must re-establish contact with our club secretary we’ve a meeting coming soon I believe. must get a decent calendar

[Paul TParticipant @pault84577]

Hi Phil

Birchwood is not a really big show but it is a very friendly event at a pleasant venue, I like it most of all because it is only a few miles from my home so I don’t have far to travel.

This year might prove to be more exhausting as there will be two shows within a mile of each other.

Paul

[Paul TParticipant @pault84577]

I thought that I should explain the layout of the drive system so I took some more photos and added some text to show the major parts.

 

Hopefully I might be able to tidy up this unit later today and fit the rubber anti vibration mounts.

 

I should also add that the entire unit has a weight of 2.2 kg

 

Paul 

Edited By The Fat Controller on 30/05/2009 08:11:41

[Bob Abell 2Participant @bobabell2]

Morning Paul

 

Hope you`re feeling a little better today?

 

Will you post another shot of this motor drive with your trusty rubber 24″ rule alongside?

 

Got to say that the chain drive don`t look right, Sunshine!……………Try small proper cycle chain?

 

If you fit the sprocket directly on the prop shafts…………..you wouldn`t need a coupling?…eh?

 

Just an idea…………………Bob

[Paul TParticipant @pault84577]

Morning Captain Bob

 

I tried cycle chain but the links are to big for the size of sprockets that I require, if this chain fails then I will have to use pulleys and belts.

 

The idea behind the primary drive unit (ie engine, sprockets etc) is that the whole unit can be removed for ease of transport…….as you can see from the weight its a heavy lump so I am planning to insert the unit at the lake side using the couplings as the points of connection.

With a removable drive unit, power packs and ballast I am aiming to keep transportable weight of the boat down.

 

And just for you a special photo

 

Paul

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