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Author Topic: SG&K 1920 Gentleman's Runabout MK2  (Read 5228 times)

canabus

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Re: SG&K 1920 Gentleman's Runabout MK2
« Reply #50 on: September 17, 2017, 11:58:38 AM »

Hi All
Sorry all, hit the wrong button.
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ballastanksian

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Re: SG&K 1920 Gentleman's Runabout MK2
« Reply #51 on: September 17, 2017, 05:46:23 PM »

Now that is a lovely boat. The finish is marvellous  :-))
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pompebled

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Re: SG&K 1920 Gentleman's Runabout MK2
« Reply #52 on: September 18, 2017, 08:42:57 AM »

Hi Harry,

Congrats on a successful maiden!
A small video would be nice.

With the water not scaled down, sprayrails are a must to avoid having the bowwave crawling up to the deck.
If this would occur in the 1:1 version, the people on board would get very upset (and wet)...

Do you consider adding sprayrails?

Regards, Jan.
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canabus

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Re: SG&K 1920 Gentleman's Runabout MK2
« Reply #53 on: September 18, 2017, 12:55:58 PM »

Hi Jan

The trouble is that spray rails were not invented in 1920, so in keeping with the original design I did not install them.
Also the boat did not have a flag pole, but, I had to add this for  the oiler for the rudder.
I have seen a post that the sides are about 1/8" below the bottom and filled in to have hidden spray rails.
Number six project is a Miss Britain 3 at 950mm.
I had to increase the size from the original plan(130%) to get room for the 35mm motor, battery, etc.
As a stepped hull the CG is very important to get the boat sitting up on the plane.
Also I have a 3648-1450 kv 1600watt brushless which requires a boat.

Canabus
 
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pompebled

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Re: SG&K 1920 Gentleman's Runabout MK2
« Reply #54 on: September 18, 2017, 09:47:50 PM »

The trouble is that spray rails were not invented in 1920, so in keeping with the original design I did not install them.
Hi Harry,

When I build a (semi) scale model of a fast boat, my prime concern is to make it run properly, so it is a nice toy to play with.
If I have to alter the design (slightly) to acheive that, I will do so.

As an example, my M.A.S. original has two engines, my model only one, as a single motor and larger prop is more effective than two smaller ones, and, as a testmodel reveilled that small props have issues on a stepped hull, the air/water mixture, drawn under the hull by the steps rendered small props partly useless to the point that the speed dropped, untill the steps had stopped working.
My 110 cm version with one prop suffers from the same issue, but the large single prop sits deep enough to work below that air watermix on the hull bottom and keeps the grip to propel the boat forward (at silly speed, I must admit, but great fun to run).

If the bow wave crawling up the sides bothers you, I'd go for the 'hidden' sprayrails you mentioned.

Regards, Jan.
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canabus

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Re: SG&K 1920 Gentleman's Runabout MK2
« Reply #55 on: September 19, 2017, 07:52:42 AM »

Hi pompebled
The bow wave does not bother me, a bit funny, but, all the other boats give it a wide berth!!!!

Canabus
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