Vintage Gentleman’s Cruiser

[Bob Abell 2Participant @bobabell2]

Shop floor to top floor

I finally receive a set of prints for the cabin……Many thanks, Paul

Just tried the rear cabin panel it's correct position and it looks a bit too fat!

So we need to maintain the same walkway space, fore and aft

I will send you the deck width, tomorrow, at the rear window position and we'll take it from there

Are we back on track now?

Bob

[Paul TParticipant @pault84577]

Hi Bob

Are we back on track now?

No not yet but not far to go

[curlyParticipant @curly]

Hi Paul

I can remember that look, when an officer asked me a question about a completion time, my reply was very soon sir, his reply was carry on corporal, then turned away with a smile on his face.

Curly

[Paul TParticipant @pault84577]

Hi Curly

I have had many years to perfect the smile, the trick is to take it all in your stride and not to worry about it.

Paul

[Bob Abell 2Participant @bobabell2]

Building an extra large model is very interesting

It is a completely new experience and has opportunities for adding hitherto unknown features, not normally dealt with like……Opening windows……Table lamps…..Window curtains……In fact, it's actually a floating Doll's House!….Where the Ladies can get involved with their unique skills of filling the cabins with all sorts of clutter!

Visitors just love peeping through the windows of models, and spotting a nicely laid out table with a pretty tea service laid out, down to the kitchen stove, bedrooms and toilet etc!

Such is the prospect of future building attractions and this sort of stuff is already available quite readily!

I'm going a little overboard there, chaps but there are the cranks out there, who would love this sort of thing!

Picture to follow

Bob

Sorry, chaps, the IPad is being naughty tonight, can't post the picture

 

Edited By Bob Abell on 12/09/2014 23:09:16

[Diede van AbsParticipant @diedevanabs87670]

Well, a build this size both caters and asks for that kind of detailing, Bob. It is indeed quite disappointing when such a big model with such big windows is on display and you peek through the windows, only to discover the motor, ESC, servo and wiring. So, by all means, please DO go overboard on this one. I for starters would love it.

As for the iPad: I am not that surprised… As an IT-guy (and an iHater of some sorts) I always advocate "ICT and fruit do not compute"

(did you try turning it completely off and then on again? I know it is the standard first question, but it actually helps often…)

[Bob Abell 2Participant @bobabell2]

Thank you, Diede

Finally got the picture……It's just part of the cabin, showing the window framing and I was transported to think of future goodies and got carried away

The problem at the moment, is the weight. I may chop out a few of the heavy 10 mm bulkheads, to lose a few pounds?

Paul is already one jump ahead of the pack, and is looking into splitting the hull!

Hope you can understand the olde English phrases etc?

Bob

[Bob Abell 2Participant @bobabell2]

From Smart Alec on the shop floor to the Chief Designer

"Just found out the current weight of the build!"

"How did you do that, Alec?"

"By a cunning plan, my Lord!"

"That sounds fascinating, tell me more!"………etc

I rested the stern on a stand and lifted the bows up, with a spring balance and it read 9lb

The hull is 64 ins long, so the moment is 9 x 64 = 576 lb ins

Guessing the C of G being 35 ins, the weight of hull is 576 / 35 = 16.5 lb……(It felt like 30 lb to me!)

Clever, eh?

So we are not that heavy, after all!

I think the illusion of excessive weight came from all the junk lying about the hull, clamps etc and it may have been stuck on the stand!

Not bad, hey?……..But I think, I`ll still try and lighten where ever possible though

Bob

[Paul TParticipant @pault84577]

Design office to shop floor smart alec

Cutting out the frames is not such a good idea because they provide the strength within the hull allowing the boat to maintain its shape and resist impact damage.

Paul

[Bob Abell 2Participant @bobabell2]

Hey!…..Where`s me Brownie points for working the weight out?

Fair do`s, mate

Bob

[mike farrellParticipant @mikefarrell21522]

Hey Bob I think you may have finally flumocked Paul with your mathematical equations and just because Paul cuts lumps out of Thor –no no not without instructions from above

He might fire you -well no not reallyMichael

[Bob Abell 2Participant @bobabell2]

Hello Mike

There' s no flummoxing Paul, he's as smart as a coat o' paint!

Bob

[Diede van AbsParticipant @diedevanabs87670]

"The problem at the moment, is the weight"

Wait, whut? Such a big hull, and you are worried about WEIGHT?

Maybe you should stop making all your fittings from solid lead, then! (and benches made from balsa or ply also look better than lead ones )

Luckily, I do understand quite some english, including sayings. I might miss one every now and then, though.

[Bob Abell 2Participant @bobabell2]

Work in progress……..Not a pretty sight!

Decided to buy a Power Sander, to help with cutting the windows out

It works well too

The model is slowly progressing, without us realising it!

Really enjoying the build due to it`s unusual and novel scale

Bob

[Paul TParticipant @pault84577]

Design office to Workshop.

I have just realised that I haven't supplied Bob with all of the superstructure drawings so the keyboard is humming whilst I catch up.

Doh!

Paul

[Paul TParticipant @pault84577]

Overworked designer to tea swilling workshop.

A few questions for you to mull over whilst eating your cucumber sandwiches.

Are you still intending to use twin Abell drives in this boat and if so can you confirm the types and sizes of the motors.

If the locations differ from the orgional plan can you provide the overall size and proposed location of each Abell unit.

Also if different to the original what sizes are the propellers, propeller shafts and rudders.

Nice sander by the way

Edited By Paul T on 17/09/2014 16:35:17

[Diede van AbsParticipant @diedevanabs87670]

Nice sander indeed, Bob! I have the same toy in my workshop. Don't use it all that often, though – it is quite agressive – but still, very nice toy.

[Bob Abell 2Participant @bobabell2]

Hello Paul

It's a bit too soon to answer your question about the motor choice

Still intend to fit twin Abell units and probably using four MFA 850's

We've never mentioned the actual prop size, but I think two 3" would look ok?

Don't see why we would need longish prop shafts

Bob

[Paul TParticipant @pault84577]

Hi Bob

For the 5ft boat the designed prop size is 70mm so 3in might be slightly to large as it might impact the hull.

The prop shafts are 820mm long and mounted at 2.66deg which is exactly right as the boat is 1600mm long and the motors are fixed amidships, if the shafts are any shorter the angle would have to increase with the resulting loss of propeller efficiency.

 

 

Edited By Paul T on 17/09/2014 17:40:45

[Paul TParticipant @pault84577]

Bob

With a redesign of the Abell base units it is possible to use 700mm propshafts (27inch) and still maintain the 2.6 deg angle.

Paul

[Bob Abell 2Participant @bobabell2]

What mods have you got in mind?

I don't think the prop angle is all that important, we're not after flat out speed

Bob

[Paul TParticipant @pault84577]

Bob

Propshaft angles aren't about speed a steep propshaft angle makes for an inefficient propeller so there would be a requirement for a larger prop to overcome the inefficiency.

The mods involve small changes to how the base of the engine mount is constructed.

Paul

[Dave MilbournParticipant @davemilbourn48782]

Inefficient? You mean like this?
Boat: Fairey Swordsman 33'
Designer: Alan Burnard
Shaft angle: 15°

(Thanks to the Fairey Owners Club for the photo)

Bees in bonnets, mountains from molehills and storms in teacups come to mind. Only surface-piercing props and submarine scimitars are designed to run at zero degrees, Paul. We must assume all other types have been tweaked to make suitable allowances. Your refusal to make the same 'compromise' which affects over 95% of boat designs is fettering your muse, dear thing. Besides which, great long shafts are a swine to instal; prone to whipping without a centre bearing, and cost a small fortune. BTW Perkasa's shafts are even steeper than this example.

Edited By Dave Milbourn on 17/09/2014 19:34:29

[Gareth JonesParticipant @garethjones79649]

Paul,

If you assume the proportion of the thrust transmitted horizontally is defined by the cosine of the prop shaft angle then with 0 degrees, 100% will be transmitted horizontally, 5 degrees its 99.6%, 10 degrees its 98.5%, 15 degrees its 96.6% and 20 degrees its 93.9%. Maybe when you get greater than 15 degrees it's starting to become a significant factor in efficiency but I think anything up to that is fine for a model. Maybe if you are trying to get absolute maximum possible efficiency in a bulk carrier or trying to get a true scale representation for a model it becomes important to get the correct angle, otherwise, as Dave says, its a compromise along with the other installation parameters.

Gareth

[Dave MilbournParticipant @davemilbourn48782]

There you go, Paul. The head (Gareth) and the heart/mouth (me) have both spoken. Have we dented your magnificent obsession? BTW I forgot outboards and Z-drives when making my list, but I hope I still made the point in respect of inboard-mounted engines with conventional prop shafts – which is what we are talking about here.
Dave M

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