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air up spring down retracts

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Old 10-09-2011, 08:19 AM
  #1  
billberry189
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Default air up spring down retracts

I'm curious, what is an air up/spring down retract, how does it work and who makes them?
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Old 10-09-2011, 08:54 AM
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dasintex
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Default RE: air up spring down retracts

Others will chime in, basically, the retracts use compressed air to retract and hold the gear retracted in the 'up' position, and when the air is released the spring mechanism deploys or extends the gear and locks them in place in the 'down' position.

'Spring Air Products' manufactures and sells them http://www.retracts.com/
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Old 10-09-2011, 09:48 AM
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Default RE: air up spring down retracts

Love them!!Retracks are often a big problem. If you have a leak your gear isn't going to come down but with the spring that little problem is gone. They have to be mounted very well though, the recoil on the spring can break a weak mount in time.
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Old 10-09-2011, 09:51 AM
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Default RE: air up spring down retracts

That is called a fail-safe mechanism.
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Old 10-10-2011, 06:59 AM
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LesUyeda
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Default RE: air up spring down retracts

" and who makes them? "

Used to be an outfit called (surprisingly) "Spring Air":-)))))))))))))

Les
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Old 10-11-2011, 10:17 PM
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Default RE: air up spring down retracts

I think Robart is also now making some 'spring-down' retracts.

Like these: http://www.robart.com/products/sd-90...ready-wair-kit


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Old 10-12-2011, 06:32 AM
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Default RE: air up spring down retracts

I'm gonna give the 85 degree Robarts a try on my 1/6 Globe Swift currently under construction.
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Old 10-12-2011, 10:57 AM
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Default RE: air up spring down retracts

I had some Robart spring down gear but I ended up buying the parts and converting them to air up and down because the spring would not
always cause them to lock down.
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Old 10-12-2011, 05:31 PM
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Default RE: air up spring down retracts

Thanks for the info, Ira D. Anybody else have this problem?
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Old 10-12-2011, 05:36 PM
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Default RE: air up spring down retracts

Just be aware that you should not store the plane (or wing) on a flat surface with the gear retracted ...... the springs will compress and will not have the power/strength to lock the gear down.

Bob
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Old 10-12-2011, 07:05 PM
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Default RE: air up spring down retracts

These are the genuine SpringAirs:

http://www.retracts.com/index.htm

Have not purchased anything from them for perhaps five years so do not know if they are still going.

I love my two tricycle sets of SpringAirs.

The Robart Spring down air up are not the same gear at all. The Robarts came out many many years after the SpringAirs and were marketed as their Economy Series whether or not they got it right is open to question it seems although I have never used them.

John
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Old 10-13-2011, 12:34 PM
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Default RE: air up spring down retracts

I have both Spring Air and one set of the spring down Robarts and I like the Spring Airs better. The Spring Airs are a little bit more compact. The gear can be about a 1/4-1/2" shorter if need be on the Spring Airs than the Robarts
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Old 10-13-2011, 01:14 PM
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Default RE: air up spring down retracts

Does anyone know the difference between the 100, 200, 300, etc.? It's not very well spelled out on the web site.
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Old 10-13-2011, 04:45 PM
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Default RE: air up spring down retracts

Light, medium and heavy duty ratings. And they are wonderful retracts. Very reliable and easy to use.
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Old 10-13-2011, 05:18 PM
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Default RE: air up spring down retracts

I use spring-air mostly and like them. I've used a set of robart spring-air copies and they worked ok with no problem, but I think the spring-airs are stronger. I use the spring-air fill valve on all my planes, just because I think it works better than robarts and the B&D I used. Plus I have one common fill setup, not several. I've delt directly with the owner of spring-air and like him alot, he gives excellent customer service.
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Old 06-01-2018, 06:44 AM
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kenair
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Question on air up - spring down - does the control valve dump all the air to let the gear down - on a go around can you retract the gear and then lower it again?

thanks - ken
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Old 06-02-2018, 04:53 AM
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JohnBuckner
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No the retract cycle does not dump all the air and multiple retract cycles are possible, the number of which is dependant upon the tightness and leak free security of your total system.

Am currently installing a NIB set of Springair's I have located in one of my new jets.


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Old 06-03-2018, 07:57 AM
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The number of retract cycles is also dependent on the size of the on board air tank, assuming the leak free system as John stated.

Scott
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Old 06-04-2018, 04:57 AM
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Steve Collins
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One drawback to the spring down retracts is that they will always be down when you are transporting the plane. Gets to be a nuisance at times when the wings have an extended gear strut.

In my long experience with pneumatic retracts, the concern over losing all the air in flight is overblown. A little leak testing of the components prior to installation goes a long way. Not saying you won't have air leaks; just that they are usually slow and rarely catastrophic.

Some of the Chinese made retract systems that are supplied with their ARFs are notoriously leaky. Use of components with a history of reliability is the secret of consistent success. Some of the best components are those from Robart, BVM, Ultra Precision, and Sierra Precision. There are a few other U.S. made retracts that are good as well.
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