Model Boat Mayhem

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Author Topic: R.T.T.L. 2751  (Read 81459 times)

John W E

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Re: R.T.T.L. 2751
« Reply #50 on: November 27, 2009, 06:42:03 pm »
hi ya there Christian

put this into the pot for the theory.....I did a quick calculation of the weight of an extra skin made of mahogany 1/2 inch thick - using the model to scale the area required and it comes just under 1/4 of a ton in weight

now you stick that 1/4 ton on top of the total weight of the hull already and to maintain the average of 39-40 knots the power requirements - you would have to find another approx 10 horse-power per engine

...... does this make sense  :-))   ah but to be on the safe side I might put a 3rd layer of skin on .....

what really surprised me were the actual trim wedges - I was visualising a lot larger wedge in depth - just goes to show it doesnt take much to trim a boat.

aye
john
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Perkasaman2

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Re: R.T.T.L. 2751
« Reply #51 on: November 30, 2009, 12:26:07 am »
The film 'Hell Boats' features two disguised RTTL's - sadly, footage of these handsome craft seems very scarce.  {:-{
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John W E

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Re: R.T.T.L. 2751
« Reply #52 on: December 04, 2009, 09:46:50 pm »
hi all just a little progress report

side planking is finished and progressing the bottom planking

johne
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riggers24

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Re: R.T.T.L. 2751
« Reply #53 on: December 04, 2009, 09:50:57 pm »
Bluebird,

What preparation do you do to the inner layer before you start the outer layer of planking

Riggers
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DickyD

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Re: R.T.T.L. 2751
« Reply #54 on: December 04, 2009, 10:04:55 pm »
Where would you be without Perkasaman John ?

Lonely  {-) {-)
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Perkasaman2

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Re: R.T.T.L. 2751
« Reply #55 on: December 05, 2009, 01:58:41 am »
Divvent fret Dicky!  ;)  {-) :}
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John W E

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Re: R.T.T.L. 2751
« Reply #56 on: December 05, 2009, 09:41:51 am »
Quote from: DickyD on December 04, 2009, 10:04:55 pm
Where would you be without Perkasaman John ?

Lonely  {-) {-)


the same as you you would be knackered without  your very best mate GOOGLE
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John W E

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Re: R.T.T.L. 2751
« Reply #57 on: December 08, 2009, 02:28:38 pm »
Hi All
 
All the outside planking is now finished and it has been sanded down.  This has now been given one coat of finishing epoxy and will now be left to dry for twenty-four hours then it will be sanded down and re-coated with two more coats of Zepoxy finishing resin.
 
Aye
John e
bluebird
 
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steve pickstock

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Re: R.T.T.L. 2751
« Reply #58 on: December 08, 2009, 03:21:48 pm »
That is a thing of beauty. :-))
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Flying Sparks

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Re: R.T.T.L. 2751
« Reply #59 on: December 08, 2009, 10:14:53 pm »
Looks too good to paint  :-))

Keep up the good work.

Phil
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John W E

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Re: R.T.T.L. 2751
« Reply #60 on: December 18, 2009, 07:18:49 pm »
Hi there all

Just a quick update.   I have finished rubbing down the outside of the hull; and removed it from the building board.  As you can see, I have installed the prop shafts and the motors.   The motors at the moment are only in temporarily and so I can see how they perform - they are an MTronik Vision Motor - originally I was going to use a Graupener 600E motor - and I still may go down that route.

Also, I have added the rudders and the rudder tiller arms.   As yet I havent fitted up the linkage between them.

Here's a couple of pics....
aye
john e
bluebird bloobs
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DickyD

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Re: R.T.T.L. 2751
« Reply #61 on: December 18, 2009, 09:12:19 pm »
I bet you change those motors John, I have two in my workroom.

Came out of my gunboat and PT boat because they were so noisy I could not hear the sound units.

Looking good though. :-))
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John W E

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Re: R.T.T.L. 2751
« Reply #62 on: December 19, 2009, 05:44:20 pm »
Dicky hi ya there

The motors run nice n sweet and quiet.  The problems, which I have sorted now were the:

Cheap - Ebay prop shafts  >:-o which I have managed to re-bush in situ with smaller bushes which fit the propeller tube properly rather than being a rattling good fit.

Couplings - I removed the red insert and replaced it with a bit of silicon tubing and the motor can hardly be heard, whilst its running at full belt.   But, as soon as the red couplings are put back - its like a bag of hammers - so that is the next job to sort out.

I have tested the model in the bath - and it empties the bath quite nicely!  %%   Drawing all of 12 amps per motor.

So, I think I am going to have Mr ACTion's heavy duty P94.

aye
john e
bluebird
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DickyD

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Re: R.T.T.L. 2751
« Reply #63 on: December 19, 2009, 06:44:34 pm »
Aye John roll on Christmas.  :-))
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John W E

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Re: R.T.T.L. 2751
« Reply #64 on: December 24, 2009, 10:50:48 am »
Hi all
just a quick update, started fitting the deck planking

aye john e

bluebird

ONE DAY TO GO

Dicky  {-) :-))
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FullLeatherJacket

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Re: R.T.T.L. 2751
« Reply #65 on: December 24, 2009, 11:04:03 am »
Don't forget to leave room for a 4" speaker, Bloobs   ;)
FLJ
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John W E

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Re: R.T.T.L. 2751
« Reply #66 on: December 24, 2009, 11:06:44 am »
Quote from: FullLeatherJacket on December 24, 2009, 11:04:03 am
Don't forget to leave room for a 4" speaker, Bloobs   ;)
FLJ

 Its all in the plan :-)) :-))
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davidm1945

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Re: R.T.T.L. 2751
« Reply #67 on: December 24, 2009, 02:47:43 pm »
Quote from: FullLeatherJacket on December 24, 2009, 11:04:03 am
Don't forget to leave room for a 4" speaker, Bloobs   ;)
FLJ

Does anyone make a sound unit that sounds like 2 RR Griffons?

Dave.
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John W E

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Re: R.T.T.L. 2751
« Reply #68 on: December 27, 2009, 12:22:18 pm »
aye aye there

Through the grapevine I have heard there is a sound unit on a test bed ... it has had a brief outing ... but stilll in test.   This unit, so I believe, reproduces digital sound recordings and which may be downloaded from the computer.

One of the main sounds, if required, can be a multiple Griffen engine.

Also, one may record other sounds onto this unit - but - we will have to wait and see.

I believe the code name of it may be the P100.

aye
john e
bluebird
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davidm1945

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Re: R.T.T.L. 2751
« Reply #69 on: December 27, 2009, 05:25:20 pm »
Somebody mentioned to me that Tamiya do a sound unit for their tanks. Yeah, I know it's probably some big German diesel but it may sound better than the little 4 cylinder petrol jobbies on offer at the moment. Does anyone have any more info on this? I can't seem to find anything on the net.

Dave.







Modified for spelling  :embarrassed:
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Umi_Ryuzuki

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Re: R.T.T.L. 2751
« Reply #70 on: December 27, 2009, 06:24:29 pm »
Absolutely gorgeous...

Nice to see your work in progress.  :-))
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John W E

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Re: R.T.T.L. 2751
« Reply #71 on: December 28, 2009, 07:34:41 pm »
thank you for your all of your kind comments on the build

aye
john
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dbninja

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Re: R.T.T.L. 2751
« Reply #72 on: December 29, 2009, 08:03:46 am »
loverly bit of building there..  it would be a shame to paint that hull :-))  thanks for sharing!

daft question time :}

on the original boat....  what is the construction and purpose of the lattice structure round the base of the front of the superstructure?


thanks
db
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John W E

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Re: R.T.T.L. 2751
« Reply #73 on: December 29, 2009, 01:09:15 pm »
hi there dbninja

According to the drawings which I am working from - the latticework in front of the bridge are in actual fact - open vented lockers.   These are used for storage of ropes and fenders.  There does seem to be hatches on the top for gaining access to them.

aye
john
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dbninja

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Re: R.T.T.L. 2751
« Reply #74 on: December 29, 2009, 01:47:27 pm »
Quote from: Bluebird on December 29, 2009, 01:09:15 pm
hi there dbninja

According to the drawings which I am working from - the latticework in front of the bridge are in actual fact - open vented lockers.   These are used for storage of ropes and fenders.  There does seem to be hatches on the top for gaining access to them.

aye
john


many thanks...  i thought that might be the case....      but wasn't sure


cheers

db
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