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Tam Jets Gear Fail Safe

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Tam Jets Gear Fail Safe

Old 07-31-2012, 06:45 AM
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califlyguy
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Default Tam Jets Gear Fail Safe



Anyone know of a another great gear fail safe other than Tam Jets? Not on the Tamjets site anymore.
I go here http://www.tamjets.com/gearfailsafe.phpand click buy it in our store and its not there..

Old 07-31-2012, 06:53 AM
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FalconWings
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Default RE: Tam Jets Gear Fail Safe

Yes, 42% Scale is the name of the company. Great product with digital pressure readouts, so you won't need pressure gauges.

Or get an EV5U Pro, it has a built in fail safe...depends onwhat you need.
Old 07-31-2012, 06:54 AM
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Default RE: Tam Jets Gear Fail Safe

Dan Gill has one at www.Details4Scale.com

Also, Todd at Dreamworks sells the TAM Failsafe and he has developed his own...don't know if it is in production yet but he posted the unit for feedback and pre-ordering about a week ago. www.dreamworksrc.com

If you like Tam's, you might want to call him directly to see if he has them in stock. From time to time, the on line store does not work too well.

Good luck,
Rex
Old 07-31-2012, 07:00 AM
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califlyguy
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Default RE: Tam Jets Gear Fail Safe

Ineed one for my 2.6m Skymaster Viper.. I have called over to Tam Jets but have yet to get a responce back.. Thanks for all the info..
Old 07-31-2012, 07:33 AM
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Default RE: Tam Jets Gear Fail Safe

If you need a fail safe and a sequencer this one would be a good choice.
Vin...

http://shopbvmjets.com/zencart/index...o51531obu0cd54



Old 07-31-2012, 07:50 AM
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Default RE: Tam Jets Gear Fail Safe

This unit also provides sequencing and failsafe: http://dreamworksrc.com/catalog/smar...er-p-1222.html
Old 07-31-2012, 07:43 PM
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Default RE: Tam Jets Gear Fail Safe

Todd, I see it has an "accidental gear up" protection upon power up, but does it lower the gear inflight if pressure drops below a user selectrable pressure? I assume it would?
Ryan.
Old 08-01-2012, 04:42 AM
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Default RE: Tam Jets Gear Fail Safe

Ryan,
Yes, indeed. This unit provides most of the same functionality as the EV5U without the valves built in.
Digital Programable failsafe from 1-100psi
Old 08-01-2012, 05:44 AM
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Default RE: Tam Jets Gear Fail Safe

If you guys want a simple, very light, reliable, inexpensive, and very effective and controllable way of getting your gear down in the event of an air leak, or total air loss, read the last edition of RCJI. All it needs is an air micro switch, a T fitting, and a non return valve (Clippard items) plus a little tubing. Its a system I designed for my Skygate Hawk and is based on the simple emergency system of several fullsize jets I have flown. It works and can be very easily added to an existing installation.

Regards,

David.
Old 08-01-2012, 08:02 AM
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Default RE: Tam Jets Gear Fail Safe

David: How about a little more detail for those of us who don't get RCJI. Thanks.

Mike
Old 08-01-2012, 08:17 AM
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Default RE: Tam Jets Gear Fail Safe

As a guess I would say its a separate emergency air tank plumbed into the main air system with a mini trip valve triggered by the down gear switch.
Vin...
Old 08-01-2012, 08:36 AM
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Default RE: Tam Jets Gear Fail Safe

I still have a new one if your interested, John
Old 08-01-2012, 10:25 AM
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Default RE: Tam Jets Gear Fail Safe

We have 20pcs of the Tamjet unit coming.... should have stock Friday or Monday....
Old 08-01-2012, 11:35 AM
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Default RE: Tam Jets Gear Fail Safe

Hi Todd,
Will these work at voltages greater than 4.8volts?
John
Old 08-01-2012, 12:30 PM
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Default RE: Tam Jets Gear Fail Safe

4.8 to 6V
Old 08-01-2012, 02:00 PM
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Default RE: Tam Jets Gear Fail Safe

Todd,

Will you have the hard case ones or the ones in the plastic covering?

Thanks
Old 08-01-2012, 03:52 PM
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Default RE: Tam Jets Gear Fail Safe

There is no more "Hard Case" Tamjet units, he ran out of the cases over a year ago. Only ones still available in limited quantity are the shrink wrapped units - At least until the new Dreamworks Failsafe is available, in production now.
Old 08-01-2012, 03:53 PM
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Default RE: Tam Jets Gear Fail Safe

Ok, Thanks!
Old 08-02-2012, 03:35 AM
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David Gladwin
 
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Default RE: Tam Jets Gear Fail Safe

I thought of putting a gear fail safe on my Skygate Hawk but wanted a better system, here's the idea based on the Jet Provost (and F4) system.

The servo which drives the gear valve can contact an air micro switch when it over travels slightly from the gear down position, the over travel being created by mixing gear to gear on the radio. No servo or channel required. The air supply to the micro switch is either the brake tank or a separate air tank. When the micro switch opens the air from this tank is fed to the valve via a T connector In the supply line but is prevented from returning to the main tank via a NRV inserted in the supply line upstream of the T. It's that simple.

So if your gear doesn't extend when selected down operate the mixer switch and feed alternate air to the valve at the pressure in the reserve tank. Down comes the gear, simple. !

If you have an electronic gear valve use a micro servo Y,d into the channel to operate the micro switch.

If you have air driven doors, supply this valve too with alternate air, if you wish.

If desired, instead of using the brake tank, use a separate air tank.

The advantage of this system is that YOU choose when to extend the gear, even after the original leak which is almost certainly in the UP system.

You also extend the gear with full pressure in contrast with a lower, depleted pressure.

It is tested by retracting the gear, then clamping the main supply hose and then trying the ALT system, simple.

I believe this is a more controllable and potentially more reliable system than an electronic faisafe, less than half the price, too.

Regards,

David.
Old 08-02-2012, 05:47 AM
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Default RE: Tam Jets Gear Fail Safe

cool idea.. I dont get RJII, can you post a pic david?
Old 08-29-2012, 07:16 AM
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Default RE: Tam Jets Gear Fail Safe

Gear Failsafe are back in stock.
Old 08-29-2012, 12:33 PM
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Default RE: Tam Jets Gear Fail Safe

Here's a picture of my system. Here the servo is in the normal gear down position, valve open but the servo is not contacting the micro switch, triggering a slight override by mixing gear to gear opens the air micro switch feeding standby air to the selector valve. In this layout I have used a separate tank (you could use the brake tank) and fill valve plus a guage. The normal supply line is the blue line, the standby air is T'ed into it but can't pressurise the main supply tank because of the one way valve in the line. This system is going into all my large jets.

Regards,

David.
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Old 08-29-2012, 01:07 PM
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Default RE: Tam Jets Gear Fail Safe

David,
Thanks for sharing.
What if the button valve leaks? You could lose all primary and secondary air couldn't you?
I had a problem with that valve once, granted it leaked when not fully depressed..

I have had my A10 saved by tam's device and will continue to put some kind of backup in, at least until we go electric!

Dave
Old 08-29-2012, 11:28 PM
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David Gladwin
 
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Default RE: Tam Jets Gear Fail Safe

See below.
Old 08-29-2012, 11:32 PM
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David Gladwin
 
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Default RE: Tam Jets Gear Fail Safe

Yes Dave you are correct so belt and braces may be the way to go. That said I have always had complete success with Clippard units and the rare leakage problems I have had have been internal cylinder seals in the retraction pistons which would be handled by my system.

Now you have raised the issue (thank you !) I will protect against the leak you suspect by inserting a one way valve in the line between the T and the micro switch. Should solve that problem as you would need a simultaneous leak in two components, both the NRV and the micro switch before you lost all air, extremely unlikely. ( By the way in this shot the hoses on the switch are transposed.)

I have had an air micro switch on the nose gear door of my. BVM F4 which is actuated on every flight by the nose leg which signals all doors closed, still working perfectly after 12 years.

I guess nothing is absolutely certain as discovered by the captain of the Polish Boeing 767 when both his primary and alternate gear extension system failed and he landed wheels up at Warsaw !

Regards,

David.

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