Model Boat Mayhem - Forum

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 on: Today at 04:30:24 AM 
Started by The long Build - Last Post by Martin (Admin)

  First Titanic menu fetches 100k at auction  -

 on: Today at 04:12:44 AM 
Started by tassie48 - Last Post by Martin (Admin)

 ..... never ceases to amaze me what you can learn here on Mayhem!

 on: Today at 02:29:16 AM 
Started by GaryC1234uk - Last Post by tigertiger
To some degree it is trial and error. Your feedback is not as direct as on a full size boat but there are clues. You know your points of sail, now work backwards from what you know/see of the boats behavior. You intrinsically know this, but may not have worked backwards before.

You know the boats position on the water. You know the position of your sheets, from your sticks on the RC transmitter (Tx), you know your rudder position. You can see how your sails are behaving. On smooth water you an see your wake.
Imagine you are sailing along, and your sheets are half out. Push the stick on your TX to let out more sheet. If the sail snaps out you have more thrust, showing your sail was hauled in too much before. If the sail does not move your sheets were too slack.
If you let the sheets in/out a little and she appears to accelerate/decelerate...
If you are on a starboard tack and you are having to use more port rudder to keep her straight (watching the wake), you are close hauled and may have your sheets hauled in a little too far. You may not have watched your wake sailing in the real world.

The other clues you know. Heel angles, dropping off before going into irons, broaching etc.

There is trial and error yes, but there are clues and also the need for practice. I have been on waters with light to no wind, trying to do everything right and getting very little movement. Others have been moving on at a slow and steady pace. Beginning with the boat within easy view, and as you get more practice, you can judge better when the boat is further away.
You can try to use a pennant atop the mast, the problem is that you don't know if the pennant is angled towards you are away from you.

 on: Today at 01:43:14 AM 
Started by tassie48 - Last Post by derekwarner_decoy
tassie....this is a very complex issue, however simplified.......

'the mechanics of the rudder system is such that it could withstand an opposing force of approximately 1/3 of the vessels [weight] displacement....and within these limits would act as a rudder'

This being [in round figures] a Corvette of ~~1000 tons, and the rudder structure resistance ~~300 tons   

So if the Corvette were helmed at speed greater than the limit, the vessel hull would commence to be pushed sideways without steerage  :((

Fully agree, for greater mechanical reliability, twin rods between the servo and the rudder........during a turn, one rod is in compression & the other in tension & visa versa in the opposite direction........balance of forces  :-))


 on: Today at 12:22:58 AM 
Started by tassie48 - Last Post by tassie48
I just read while doing research on my WW2 1/24th scale PA-2 German Flower class Corvette that the rudder had a rating of 321 in Tons Going Ahead and 349 in Tons Going( Taken from Astern from the Anatomy of the Flower Class Corvette Agassiz book) which is a hell of a lot of pressure and got me thinking I always use twin arms on my rudder to servo linkages one to push and the other to pull then looking at other model I see a lot just using a single arm to the servo my early model a twin arm way back in the 1960s with old Macgregor rc gear I asked the guy I purchased the model from and he said that it makes sense to keep even tension on the servo as a free horn on the servo is wasted ,and having both arms working is a no brainer to use .
He called it value for money engineering so I have for the past 49 years used this system and will always do so I understand on some models space is the issue and a single arm is need just would like to no if other modelers use the two arm system like me from a seed planted when I was a kid to today still using the two arm servo system tassie48     

 on: Today at 12:13:48 AM 
Started by tt1 - Last Post by tt1
item now sold pending, thank you Tony.T.

 on: Today at 12:11:21 AM 
Started by tt1 - Last Post by tt1
chargers now sold thank you, Tony.

 on: Today at 12:10:08 AM 
Started by tt1 - Last Post by tt1
they were dental pliers, s/s and stronger, cheers Tony.

 on: Yesterday at 11:21:28 PM 
Started by Stan - Last Post by JayDee

The weather tried very hard to spoil the days event - - and failed !!!.
Lots of boats, lots of laughing and chatting, very, very enjoyable!.
Did a test sail of my "new" 10 Rater yacht, all went very well, just minor adjustments.
Really, really enjoyed myself.

John.  :-)) :-)) :-))

 on: Yesterday at 11:20:16 PM 
Started by Chris G - Last Post by spud
Hi Gwylan

Like Terry,  I'm also intrigued to see the alterations to the sail set up .

A couple of pictures when you get chance would be great


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