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Author Topic: Tsekoa II  (Read 1458 times)

manofkent

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Tsekoa II
« on: December 12, 2018, 11:45:18 AM »

I am expecting the kit from Slipway models for the ex-Canadian Coast Guard Buoy Layer, Tsekoa II next week.  I see on their web page photo gallery that the props are shown to be inboard rotating.  Any comments on this from you?
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jaymac

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Re: Tsekoa II
« Reply #1 on: December 12, 2018, 07:04:49 PM »

Can't remember which way mine are  ( never built it) will dig it out and have a look  never impressed with it
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manofkent

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Re: Tsekoa II
« Reply #2 on: December 12, 2018, 07:09:46 PM »

Thanks for that. As you're Somerset based any chance you can come to our sailing lake on Warminster one Sunday morning. (see Warminster model boat club web site)
Robin
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jaymac

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Re: Tsekoa II
« Reply #3 on: December 12, 2018, 07:37:15 PM »

Hi Thanks for the invite  but a bridge too far for me these  days  I use Portishead lake there is a build on here  good luck with yours
https://www.modelboatmayhem.co.uk/forum/index.php?topic=35268.0
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manofkent

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Re: Tsekoa II
« Reply #4 on: December 12, 2018, 07:44:50 PM »

Thanks for pointing out the link, will have a study of that. One of our members goes to Portishead for yacht racing .
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Fred Ellis

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Re: Tsekoa II
« Reply #5 on: December 13, 2018, 08:39:55 AM »

Hi Manofkent


I have some photos of her when she was being sold, if you would like to P/M me your email address I will forward them on to you.


Fred
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number-1

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Re: Tsekoa II
« Reply #6 on: December 16, 2018, 08:32:34 PM »

I have this kit in the loft untouched, looking forward to seeing yours comlng to life :-))
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Taranis

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Re: Tsekoa II
« Reply #7 on: December 16, 2018, 08:42:07 PM »

I am expecting the kit from Slipway models for the ex-Canadian Coast Guard Buoy Layer, Tsekoa II next week.  I see on their web page photo gallery that the props are shown to be inboard rotating.  Any comments on this from you?
I would hazard a guess that model slipway did the research and advised correctly for their model
Maybe digest this to form our own conclusion  :-)) 
http://hydrocompinc.com/knowledge/outboard-vs-inboard-turning-propellers
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ANDY
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manofkent

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Re: Tsekoa II
« Reply #8 on: December 16, 2018, 08:58:02 PM »

Fair point. I have done some further enquires and have come to the conclusion that inboard rotation is correct .
Had email from SWM and kit is being dispatched tomoz. (17th)
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Taranis

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Re: Tsekoa II
« Reply #9 on: December 16, 2018, 09:03:36 PM »

I'm not convinced myself that it makes a significant difference on a scale sailing model but easy to change polarity and swap props over at some point if not satisfied. More significant is not to have same rotation.
My tug has outboard rotating 68mm props (Protean/propshop cast bronze) and I just followed established protocol for this  {-)  So much power and wonderful wake  :-)
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ANDY
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jaymac

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Re: Tsekoa II
« Reply #10 on: December 16, 2018, 10:49:32 PM »

''More significant is not to have same rotation''
[/size]That's debatable the Graupner Wiesel runs 3 in  the same direction and the majority of WW2 Mtbs and rescue boats  also did
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Stan

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Re: Tsekoa II
« Reply #11 on: December 16, 2018, 10:56:45 PM »

Most of my multi prop models have outward turning props never been a problem. All my models have props fitted from Protean/Prop Shop hope this helps.




Stan. :-)) :-)) :-))
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Taranis

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Re: Tsekoa II
« Reply #12 on: December 17, 2018, 05:16:22 AM »

''More significant is not to have same rotation''
That's debatable the Graupner Wiesel runs 3 in  the same direction and the majority of WW2 Mtbs and rescue boats  also did
Three props isnít comparing apples with apples though  :-)
My understanding is that the outer props counter rotate outwards  and centre either way. Fast forward with all props
Slow with centre prop and manoevering astern with outer props ? But still just as well to experiment.
If Graupner didnít provide independent control of the props then it would be pointless to have the above set up and perhaps not important for a model ?
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ANDY
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Fred Ellis

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Re: Tsekoa II
« Reply #13 on: December 17, 2018, 07:50:03 AM »

Propwalk - Twin Screw Most twin screw boats use contra rotating propellers. Each propeller is placed either side of the centre-line and is outward turning therefore rotating in contrary directions. When both engines are used simultaneously they cancel out propwalk and the boat drives straight.
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Stan

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Re: Tsekoa II
« Reply #14 on: December 17, 2018, 08:13:12 AM »

Sorry to say the Graupner Wiesel is totally wrong in relation to number of props. The full size vessel had four shafts not three that were fitted to the model. My PT 596 has three shafts all props spin outwards with no problems at all.




Stan
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jaymac

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Re: Tsekoa II
« Reply #15 on: December 17, 2018, 08:34:29 AM »

That's debatable the Graupner Wiesel runs 3 in  the same direction and the majority of WW2 Mtbs and rescue boats  also did
know the real Wiesel had 4 Stan
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Stan

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Re: Tsekoa II
« Reply #16 on: December 17, 2018, 10:18:55 AM »

HI jaymac hope to build mine in the future but with four shafts not three advised by Graupner.

Stan.
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jaymac

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Re: Tsekoa II
« Reply #17 on: December 17, 2018, 10:33:20 AM »

Wow What scale Stan there is only about 3/8'' clearance twixt centre prop tips and outers on mine
Jay
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Fred Ellis

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Re: Tsekoa II
« Reply #18 on: December 17, 2018, 12:10:13 PM »


Back to the question of the Tsekoa 2, outward turning props produce a bit more stern lift, inward turning sink the stern a little. there is no hard rule it really depends on the hullform and usage.
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Taranis

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Re: Tsekoa II
« Reply #19 on: December 17, 2018, 12:21:34 PM »

Consensus across the WWW is that slower moving vessels like tugs benefit from outward turning whilst faster vessels commonly use inward turning
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ANDY
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Fred Ellis

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Re: Tsekoa II
« Reply #20 on: December 17, 2018, 01:31:21 PM »

How she look's to-day.


Fred
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Stan

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Re: Tsekoa II
« Reply #21 on: December 17, 2018, 03:40:17 PM »

Much prefer the first option.


Stan.
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Fred Ellis

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Re: Tsekoa II
« Reply #22 on: December 17, 2018, 06:21:37 PM »

Hi Manofkent
 
To try and put this question to bed I emailed the Gentleman in Canada that helped me out with the photo's that I sent you, just ten min ago he sent me the following "Hopefully the photo of the props will help. They are stacked face out. so that is what they look like mounted facing aft."

I hope that this is of some help.
 
Fred
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