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  #1  
Old 07-20-2010, 07:29 AM
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dan dan is offline
 
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Default FOUND! Cheaper source for tip-up canopy struts

Every few years, one (or both) of my tip-up canopy struts gives up the ghost. It happens. Van's now charges $32 apiece for replacement C-690 (Van's p/n) struts, as you can see here (http://www.vansaircraft.com/public/parts.txt):

C-690 REPLACEMENT STRUT $32.00

It's not a bank breaker, but for the longest time I've had this feeling like that's gotta be a jacked-up price. Several years ago I searched for a cheaper source for the same part and came up short.

So this time I had to replace 'em, I again started doing some research. The part is the Stabilus Lift-o-Mat 8x18mm p/n 752819. I don't even remember where I found this PDF, but it came from somewhere on Stabilus' web site:

http://www.rvproject.com/Stabilus1597.pdf

It shows the specs of the 752819 as:
Stroke Length: 6.3"
Extended Length: 15.95"
Force: 22.5 lbs

So anyway, I emailed Stabilus to see where I could buy these puppies directly. They responded today and told me that "Orr & Orr" is the recommended distributor. Well, lo and behold, they sell 'em for $18.25 apiece!!

http://orrorr.thomasnet.com/item/gas...ends/h-9503-25

Don't know about you, but I'm happy to have found a half-price source! Figured I'd share this little tidbit with the rest of the RV world. Pass it on.

Oh...another little tidbit. If you wipe the strut down with alodine, all the white printed text comes right off. Kind of a cleaner look.
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  #2  
Old 07-20-2010, 07:41 AM
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Default

thanks for the info Dan, good to know. Keep us posted on how they hold up...unfortunately cheaper sometimes means junk. But hey, you could replace them twice as often at that price!
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  #3  
Old 07-20-2010, 08:49 AM
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schristo@mac.com schristo@mac.com is offline
 
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Default More force options

With a full source supplier it might be worth trying the next force selection, 752827 with 34 lbs (150N vs 100N)... same 18.25 price.

Dan, was Orr & Orr reasonable with shipping cost?
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Last edited by schristo@mac.com : 07-20-2010 at 10:04 AM.
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  #4  
Old 07-20-2010, 09:32 AM
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McMaster-Carr part number 9416K172 is similar (30lb force), but has threaded ends. I wonder if you could re-use the ends from the stock springs?
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  #5  
Old 10-12-2010, 01:31 PM
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339A 339A is offline
 
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Default Price Break...

Well the lift struts on 339A are finally starting to get weak. (After 5 years and 780 hours) So I began searching around for some replacement ones. After scouring through the archives I came across this thread. I figured I would add to it so I can find it again when I need to place another order. I had contacted a company in Canada (Points West Marketing) who supplies the Stabilus ones. They e-mailed me back stating the following:

Thank you for the gas spring inquiry.
We do carry Stabilus Lift-O-Mat item #GAS752819 in-stock.
Your cost/availability is as follows:

#GAS752819 = $33.90/ea. USD Based on ordering 2 pcs.

*Shipping charges via UPS ground to most US locations=$15.00 USD.

*Delivery time 3-4 days regular service. Can be expedited if need be, additional shipping charges will apply.


OK, so $33.90 each plus $15.00 shipping definitely no break there. Pretty much the same as Vans price. So I tried Dans link and got the $18.25 each price. So I went ahead and ordered them. This morning I get a confirmation e-mail with the following:

Product ID: H-9503-25
Buyer Product Number:
Product Name: Gas Springs with Composite Ends
Product Description:
Applications Include: Doors, lids, hatches, furniture, boats, recreational vehicles, office equipment and many more. Available in composite, metal or blade ends.Mounting brackets must be ordered separately
Units Per Package: 1
Package Type: Each
Package Price: $12.05
Quantity: 2
Item Total: $24.10


Subtotal: $24.10
Promotion: $0.00
Discount: $0.00
Tax: $0.00
Shipping:$6.47
Handling: $0.00
Total:$30.57


WOW The price goes down to $12.05 each and shipping is only $6.47! That's both of them delivered for less than one anywhere else.

The specs are the same, so I guess we'll see what they look like when they get here. Just in case you're in need of struts, it might be a good time to buy a couple.

Regards,
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  #6  
Old 12-18-2010, 11:53 PM
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Default Inquiring minds want to know

So what were your results with the struts? Were they a direct replacement? Did you have to make modifications to use them?

How did you determine whether you needed to replace one strut or both? Just take them loose and check the force it takes to operate? Does it make sense to replace just one, especially when you can buy a pair this cheap?

Thanks!

Stewart
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  #7  
Old 12-19-2010, 07:03 AM
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Louise Hose Louise Hose is offline
 
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Thumbs up So far, so good

I immediately ordered and installed a pair of the ones that Sharpie posted in July and, so far, find them a perfect replacement. The fit on the -6 was perfect and they have performed flawlessly (albeit for only four months).

Since my canopy was starting to droop down in a modest wind on a cool day, I replaced both cylinders. Just seemed like the prudent thing to do.
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  #8  
Old 12-19-2010, 07:25 AM
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Vlad Vlad is offline
 
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Default

I was very surprised to find out that struts on my Mini are exactly the same Now I have a pair of donor struts for free.


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  #9  
Old 12-19-2010, 09:17 AM
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339A 339A is offline
 
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Default Exactly The Same

Quote:
Originally Posted by 7pilot View Post
So what were your results with the struts? Were they a direct replacement? Did you have to make modifications to use them?

How did you determine whether you needed to replace one strut or both? Just take them loose and check the force it takes to operate? Does it make sense to replace just one, especially when you can buy a pair this cheap?

Thanks!

Stewart
After five years of use I just went ahead and replaced them both. Should have done it sooner. Given the cost, it's about the cheapest PM you can perform. What happened to us, on the way home from LOE we stopped at Goodland, KS. It's always windy there, I had the canopy up with the plane facing into the wind. Next thing I know it slams down.... fortunately the canopy was OK. Given that a busted canopy would have been a disaster, I'm thinking of making this a biennial event. They are certainly cheap enough.

BTW it took about 30 seconds to change out and they are exact replacements for the Vans supplied ones. Same part # and manufacturer. You could tell a huge difference in the force between the used ones and new ones (they were wore out). A simple PM which could save you an endless amount of frustration/depression and a new canopy.

Regards,
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Last edited by 339A : 12-19-2010 at 09:20 AM.
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  #10  
Old 12-19-2010, 12:22 PM
rv7charlie rv7charlie is online now
 
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Default

It's fairly easy to make a 'safety latch' for shock struts, though I haven't checked it for fit on my -7 (not flying yet). This was a required mod to a piece of equipment where I work that had clamshell covers similar to a tipup canopy.

The trick is a piece of tubing just larger than the cylinder diameter, and slightly shorter than the strut's shaft that's exposed when extended. With the strut installed so that the shaft is on bottom, the sleeve will cover the cylinder with the canopy closed, and when the canopy is opened, gravity & the angle of the strut will cause the tube to drop off-center on the shaft. If the canopy starts to close without attention to the sleeve, the cylinder will jam against the top edge of the tube (the bottom is jammed against the bottom strut fitting).

To close the canopy, just center the tube as the canopy comes down, allowing the cylinder to enter the tube.

Obviously, some effort will be needed to keep the tube off the paint on the cockpit side rail, & to minimize rattling (not an issue in industrial equipment...)

Again, I haven't used this on my -7, but I've used it successfully on a couple of different car hoods that used shock struts & it worked great, even with scraps of PVC water line for tubing.

Charlie
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