servo traval

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13 November 2008 at 19:27 #17019
Brian Astall
Participant
@brianastall30747
hello chaps,

i have a problem,how do i get 1 1/2" traval from a bog standard servo.i,m building EGRET, the one were the wheelhouse go,s up and down.cant work that bit out.HELP!!

Brian A.
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13 November 2008 at 21:50 #17027
Kevin Bellman
Participant
@kevinbellman86047
Hi Brian

I’m afraid I dont have the answer but one gizmo that might help is the new P96 ServoMorph from

Action R/C Electronics quote " can stretch a standard servo to rotate nearly 180′ "

http://www.action-electronics.co.uk/home.html

Just a thought

Regards

longshanks
21 November 2008 at 08:03 #17194
JC Uknz 1
Participant
@jcuknz1
This problem is solved by sailing boats by having an arm on the end of the servo arm to increase the radius and the amount of travel at the tip to haul in sheets. The question is do you have room in the model for such a thing? You may need to get a grunty servo for the job.

It is a question of leverage and if the servo is one inch from the pivot anchor/hinge and the object to be moved is three inches then it will be moved three times the servo’s movement.

Don’t know what EGRET is sorry
24 November 2008 at 19:37 #17250
Brian Astall
Participant
@brianastall30747
Hello Longshanks, thanks for the Action tip,have got the morph and it does what it says but the push rod bends.will keep trying.Thanks,

Brian A.
24 November 2008 at 19:41 #17251
Brian Astall
Participant
@brianastall30747
Hi JC Uknz,

thanks for your reply, will try the cam idea,sounds like it may work without bending the pushrod.

Brian A.
25 November 2008 at 21:47 #17270
Tony Bell 2
Participant
@tonybell2
Hi Brian,

GWS make a 1turn sail servo for £14 see spec on my sail servo comparison chart.

Tony
9 January 2009 at 19:20 #6516
Brian Astall
Participant
@brianastall30747
or other method
8 December 2009 at 14:52 #24462
Robert Walters
Participant
@robertwalters31200
High Brian, I am curious, what kind of boat is the” EGRET” that the Wheelhouse goes up and down

I am working on a Pusher Tug,(with a fixed wheelhouse) and I know that out there there is a set of plans for a Pusher Tug that the wheelhouse rises and falls, but I dont know what company does the said plans, can you or any other modeler help me with this
8 December 2009 at 18:52 #24465
Pierre
Participant
@pierre
Hi Robert

EGRET is a plan published by Model Boats about 10 years ago, plus or minus a couple of years – I’m not sure of the exact date. I’m sure a search of the archives would bring up something.

It was a plan of a Rhine river pusher tug with an adjustable wheelhouse – designed to cope with low bridges I guess. If I recall correctly the plan was fairly simple, designed to be built in styrene, basically a floating box, though the wheelhouse mechanism was quite ingenious. I know I have the plan and the article somewhere in my impeccable (?) filing cabinet, so if you’re really desperate, I could dig out the exact year or even send you the plan.

Hope this helps

Pierre
10 December 2009 at 14:59 #24484
Robert Walters
Participant
@robertwalters31200
Pierre, you are a gentleman, the tug I am building is in fact named “PIERRE BROUSSE” it is a Pusher like the “EGRET” (thanks to you, for letting me know that) but has a fixed wheelhouse, and I would like to improve the design of my model with a raiseing wheelhouse or Bridge.So if its no trouble to yourself I would very much like to either get the plan number and the date it was purchased by you for me to try and get a copy or failing that receiving a copy of the said plan from you.

Once again thanks for the prompt reply, hope to hear from you again.

Bob
10 December 2009 at 19:56 #24487
Pierre
Participant
@pierre
Hi Robert

Have sent you a private e-mail requesting your postal address.

Regards

Pierre
11 December 2009 at 00:41 #24491
Peter Fitness
Participant
@peterfitness34857
Brian, is the pushrod supported? Depending on its length, it may need to be to stop it bending.
12 December 2009 at 13:10 #24505
Pierre
Participant
@pierre
Hi Robert

The plans for Egrete were published in MB in May to June 1988 – I was out with the dates somewhat.! If you want them, send me a private e-mail giving me your postal address.

Regards

Pierre
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