Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length.

[CJ]

Thanks for all the comments guys, head overloaded now!!

I am liking some of these linkages though, definately puts mine to shame so will definately be upgrading mine, to what yet still not 100% sure Thanks for that link though...looks great Peter, lots of ideas now so I think I will place an order and have a play and see what works best 

To divert slightly from topic but hey it is mine, are you back from your hols Dave (Action) or in contact from a far, your website update baffled me slightly with a return of Monday 18th !!
I am sure it will do exactly what I need but just want to check on the P19 and a P43 - will give you a call Monday hopefuly 

Cheers

CJ

[Andyn]

If the two are not precisely the same length, you will run the risk of stripping the servo gears.

[Shipmate60]

Andy,
You might stall the servo, but not strip the gears.
I don't know why you make everything so dramatic.
I must have been very lucky then to NEVER have stripped a servo geartrain in over 30 yrs of modelling.
This includes extending the servo horn arms to twice their original length and then fitting 2 rods to the rudder.
I must be very lucky then according to your theory.

Just as an aside Andy, have you ever seen a steering servo fitted this way strip its gears?


Bob

[ACTion]

To divert slightly from topic but hey it is mine, are you back from your hols Dave (Action)

Unfortunately yes................ 
DM

[unbuiltnautilus]

Unfortunately yes................ 
DM

Welcome back to the Mayhem

[CJ]

Welcome back Dave, will harass you Monday 

CJ

[Stavros]

As Shipmate60 says I have never stripped a servo in either configuration so I think therefore me and Bob must be doing something WRONG if we  havnt


Dave

[RAAArtyGunner]

Metal Push Rod Connectors Ref: SL063-R - about halfway down the page  http://www.slecuk.com/catalogue/Control-Fittings.html Just add a couple of collets and tyre valve springs and you've got it.
My observations are that the distance between the two pushrod fixing points on the servo disc/arm and the tiller arm must be exactly equal or one rod will be stretched and the other compressed when the whole shebang rotates > servo and rudder binding up.
It's gonna take a heck of a lot of rudder pressure to bend a 2mm rod unless you're daft enough to make it longer than four or five inches. Ball and socket joints have nil float in them and are the preferred method of fixing to servo discs.
I've never used the push-me-pull-you arrangement and I've never had any problems. Careful setting up will avoid the over-centre effect described by Shipmate 60.
Suit yourselves.
DM

Dave,

Right have got it that equal length/connection is essential, but you are not ruling out that there may be a need to have a longer connection than 4 inches.
For example a plastic kit conversion but to then increase size of rod to more than 2mm ????????

[ACTion]

What size rudder would this kit conversion have, m'duck? It would have to be pretty much over-scale size to bend a 2mm metal rod, even if the rod were supported halfway along its length. With a servo pushing one end and a pond full of water resisting at the other, I'm putting my money on the water giving way first.
DM

[RAAArtyGunner]

What size rudder would this kit conversion have, m'duck? It would have to be pretty much over-scale size to bend a 2mm metal rod, even if the rod were supported halfway along its length. With a servo pushing one end and a pond full of water resisting at the other, I'm putting my money on the water giving way first.
DM

Dave,

Yes, good point and suggestion.
Inexperience soon shows
Thank you.
 

[HS93 (RIP)]

the only servo gears I have striped where on a Futaba 30m a long long time ago when I did car carpet racing about 1980 we all carried a supply of them in out pit boxes as the servo savers of the day where still not that good , or where the very thin plastic gears in 30m's. you would know when you bench tested a boat when building by the sound it if the links where wrong plus the standard 2mm links will bend if they are over a few inches.
urban Myth Me  think's

Peter

[Colin Bishop]

I normally only use a single link becuase my models tend to be smallish scale ones. However sometimes the linkage needs to be quite long if there isn't space near the stern for a servo in which case I sleeve the middle section of the 2mm rod with close fitting brass tube to make it more rigid. However I can see the logic of a double linkage where more precision or strength is needed although I would make one of them adjustable to ensure the two links are of exactly equal length.

As with many things, it's horses for courses really.

Colin