Push/Pull Rod Seals

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I can't find the pictures, but basicly there are 2 rods connected together, inside SD. One short wire that connects to servo and other end, of that wire, is looped and hooks thru a loop in end of 2nd wire that goes thru bulkhead. One loop is extended into a second loop, around the other wire, to prevent the wires from folding in the push direction (that is the part that's difficult to explain without pictures).
The ends of the 2 wires that are looped together has to be a snug fit so there won't be any slop in linkage, but not too tight that it will bind.
The short wire becomes a swing-arm, to eliminate the flex.
There are better versions than the looped-wire ends (less slop and no 2nd-loop), but that is the simplest to make.
I've never needed to make them (I just let 'em flex in my large SDs) but I'm told they work Great! :)
I can see how they would really be needed in a very small SD, with long servo-arms.
I hope that explains it enough? I'll continue to try to remember where the pics are, in the forum posts. I thought I copied them to my computer but can't find them.

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I just thought of another solution, if you have room for S-148 type servos.
I've used these before and they work Great! :)
Linear-servo conversion kit:

http://www.emsjomar.com/linear.aspx

[He Who Shall Not Be Named]

I just thought of another solution, if you have room,
Linear servos:

http://www.emsjomar.com/SearchResult.aspx?CategoryID=18

Dont!

Keep it simple, damnit! do it my way.

David,

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Simple ?.........You can't get much Simpler than a Linear-servo!

Actually, Linear is the way All RC servos should be made. ;)
Of course their main problem is that they can't be rotated 90 degrees to direction of push/pull rod, but that's no problem in larger models.

*Build It Bigger* is my motto from now on! :D

[He Who Shall Not Be Named]

Simple ?.........You can't get much Simpler than a Linear-servo!

Actually, Linear is the way All RC servos should be made. ;)
Of course their main problem is that they can't be rotated 90 degrees to direction of push/pull rod, but that's no problem in larger models.

*Build It Bigger* is my motto from now on! :D

Well ... you just hit on your road to fame and fourtune:

Design, prototype, test, fix the design, have them made, and market them. The world will beat a path to your door and you can indulge your every desire with the wealth that will accrue to you for making and offerings such a much-needed device.

You da man!

David,

[Subculture]

Interesting the mention of linear servos.

Back in the '70's, here in the UK, there used to be a R/C manufacturer called 'Skyleader'. It was top draw kit at the time, but the Japanese came along and priced them out of the market- they were absorbed by 'Fleet' another well known British R/C brand which has now bit the dust.

Skyleader used to supply their servos with linear conversion heads, so you could choose between the type of servo you wanted. Good stuff.

Futaba and Macgregor/JR used to make linear servos too, but clearly they lost favour with modelmakers, else they wouldn't have discontinued them.

These days you can still get an off the shelf linear servo, but it's a tiny one made by a German company called Wes-technik.

[toppack]

... you just hit on your road to fame and fourtune:

David,

Like I've said, I'M Not After 'Fame and Fourtune'.
I'll leave that for you and Mike. :D
I was just saying that Linear servos are great in some applications and would fix the problem he was having, if there's enough room in the SD, for that size servo.
I used them in a Weed-eater powered speed-boat (earth orbiter :D) that only had room for a small WTC and needed linear-servoes to keep linkage from binding, since I needed a lot of smooth linear travel for throttle and rudder (throttle mainly).
Dang It! It's Only a Hobby, for me.
I know it would stop being as much Fun if it was a business. ;)

[toppack]

These days you can still get an off the shelf linear servo, but it's a tiny one made by a German company called Wes-technik.

Wow, that looks interesting. I've not seen that one.
It would fit even the small models.

They have micro-motors also, suitable for torpedos!
(with distributors in the USA)
Thanks for the Info,

Click Link:

http://www.wes-technik.de/English/light_ng.htm

[He Who Shall Not Be Named]

Like I've said, I'M Not After 'Fame and Fourtune'.
I'll leave that for you and Mike. :D
I was just saying that Linear servos are great in some applications and would fix the problem he was having, if there's enough room in the SD, for that size servo.
I used them in a Weed-eater powered speed-boat (earth orbiter :D) that only had room for a small WTC and needed linear-servoes to keep linkage from binding, since I needed a lot of smooth linear travel for throttle and rudder (throttle mainly).
Dang It! It's Only a Hobby, for me.
I know it would stop being as much Fun if it was a business. ;)

You're points well taken -- And I have become jaded with this being a business: I've seen useful, but not often bought products, come and go. And, yes, I was being a smart-ass with you. I was 'venting', of course.

But, the market is driven by the all-mighty dollar -- which one quickly comes to appreciate once you put your effort into producing a (what seems to you) useful and needed product ... only to see your product rot on the market-place vine, or, if accepted by the buying public, not appreciated for the innovation it is/was.

The game tends to sour as time goes on. You watch others come forth with the same enthusiasm you once had, an enthusiasm not yet blunted by miscalculations as to product utility, availability (price), and promotion (never enough money to 'get the word out'). The stuff of business all too easily retards the joy of uninhibited genius.

Don't listen to that bitter old man behind the curtain ... enjoy the hobby while you can.

David,

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David,
I understand completely how you feel.
We out here on the other end of the business tend to forget how much time and effort you've put into developing your Great products.
Even tho we sometimes go off track with our own projects and ideas, we do appreciate what you given to the hobby, and I really mean that. :)
I just wish I had the time and money to put together at least one of all your designs, but as you do I most enjoy designing and fabricating my own creations, when I can.
Altho I have experience with RC ships, subs are an area that I'm learning, and I also really appreciate your help in that learning process. I'll drink to THAT!
I realize our appreciation is not making YOU 'Rich and Famous', but we do try to help with that when we can. :D LOL :D

[He Who Shall Not Be Named]

So ... why are you typing and not assembling/building something!?...

David,

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:D LOL :D
Yes, I've noticed that I have to take a lot more coffee-breaks these days. But after that last one I got the brass-tubing, for launchers, fitted into T-class bow piece.
I had to cut off part of the upper-bow section, to make it removable, to have access to launchers assembly. I've been collecting up parts for the launchers and torpedos at the same time that I'm assembling the SD, bow WTC and modifying the hull. The SD and WTC are almost completed.
Everything is covered with fiberglass Dust now! :eek:
So, *I've Been Busy* too! :D

[He Who Shall Not Be Named]

Good man.

Guess I better come through with the launcher and torpedoes then.

David,