Although I definitely wouldn't recommend it, I bought a 10 year old Sleger Spectrum F3B glider that had standard telephone jack connectors in the wings, and have had no problems with it! I doubt they were ever designed for the power load on a flap servo.

Jeff Thompson

Soaring wrote:

Soaring                        Sat, 7 Jan 2006          Volume 1 : Number 6929

In this issue:

       Re: [RCSE] Aircraft Designers - Completing the Design
       Lachowski Pod
       Your kidding.......... ?????
       RE: [RCSE] Lachowski Pod
       Re: [RCSE] Lachowski Pod (pic)
       Re: [RCSE] Sold DLG + servos & Batt F/S
       Pike Superior for sale


----------------------------------------------------------------------

Date: Fri, 06 Jan 2006 18:08:09 -0800
From: Simon Van Leeuwen <[EMAIL PROTECTED]>
To: Martin Usher <[EMAIL PROTECTED]>
Cc:  soaring@airage.com
Subject: Re: [RCSE] Aircraft Designers - Completing the Design
Message-ID: <[EMAIL PROTECTED]>

Not all DB series connectors are created equal Martin. Typical Radio Shack units are crap to say the least, and have cyclic lifespans (the number of times you can plug/unplug mating connectors before the level of resistance increases to unacceptable levels) similar to what you suggest.

The DB-15HD's that I build into customer's harnesses are rated for 400+ cycles, this due directly the design of the pin/spring contact assemblies. Although they cost more, their (electrical) performance decrease over the first 200 cycles is negligeable. Sideways movement in any of this style of connectors is a non-issue given the male/female shrouding, so you can cease worrying about this.

The average 0.100" 3pin connector that folks are accustom to are not rated for multiple cycling, some of the units I have seen coming in on F3x aircraft from overseas are downright inferior (so is the lead material).

Again, you get what you pay for here. High quality versions are indeed available that do offer high cyclic-ability, but they (again) cost more due to spring contact design that offers superior wiping without destroying both contact mating surfaces.

I like <hehe> your "non-lapriscopic" comment, I'll have to incorporate that term in my advertising...

regards

Martin Usher wrote:

My Stork uses a D type connector in the wing / wing mount to make all the connections to the wing servos. I think its a quite common arrangement on European molded planes, its convenient apart from the servo wires being all standard three pin servo wires that are not marked (so carelessly removing a receiver can lead to fun when replacing it......). The arrangement is neat but its not as good as it seems, the D types were not designed for repeated plugging and unplugging and the get a lot of sideways pull on them during wing attachment and removal -- both would contribute to the plug failing (and such failure would be intermittent.....bad news for a servo connector).

The standard three pin Molex type connector that's used with R/C equipment is quite a good compromise between cost and reliability......its probably the best connector for the job still. Deans are also OK, they're big but at least you can solder them. I don't think there's anything else I'd trust except maybe the plugs used with USB connectors -- there are are actually a lot of good connectors out there but they're not easy to buy and good connectors tend to be expensive (especially if you want something that will take repeated plugging and unplugging).

I will agree with Simon that we need to design in cabling as part of the aircraft design. Not just cables, either -- room for nose weight, mounts for servos, non-lapriscopic access to servos and linkages -- details that really aren't that difficult to get right during the design and a nuisance to add after the fact.

Martin Usher

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