Gas Strut for rear door - Defender Source
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  #1  
Old March 31st, 2016, 11:07 AM
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Question Gas Strut for rear door

Does anyone know what the ideal force a gas strut should have if I'm looking to attach one to the rear door to assist in opening and closing? I know Mud UK makes a good product but, I'm not looking to spend a fortune in sterling.


- tire weighs: 57 lbs
- wheel: I'm guessing 25 lbs (some please correct me)
- ST door: 30 lbs (some please correct me)
- tire carrier: no idea...


I found this on amazon and this brand has great reviews 179 lbs: Amazon.com: Suspa C16-21478 19.69" Gas Prop/Strut 179 lbs - Set of Two: Automotive


eberhard also makes a great option at 250 lbs capacity: | Eberhard Manufacturing Company
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Old March 31st, 2016, 11:17 AM
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I assume you have considered the Britpart kit as well? Rear Door Stay Kit - Defender to 2002 - Paddock Spares

If you want to do it yourself, you need to do the math on the geometry and forces. Struts you can just buy at any auto parts store.
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Old March 31st, 2016, 12:01 PM
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I assume you have considered the Britpart kit as well? Rear Door Stay Kit - Defender to 2002 - Paddock Spares

If you want to do it yourself, you need to do the math on the geometry and forces. Struts you can just buy at any auto parts store.


you lost me at britpart lol. but yes, math is not my strong suit....
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Old March 31st, 2016, 12:07 PM
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Well...someone needs to do the math if you want to design your own. There is no way to guess.
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Old March 31st, 2016, 12:48 PM
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Well...someone needs to do the math if you want to design your own. There is no way to guess.


right, that's why I was hoping someone knew the weights of all that stuff.
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Old March 31st, 2016, 01:10 PM
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Knowing the weights of that stuff, does not answer the question though. You need to work out the geometry of the strut. You need to know how much angle you are willing to deal with the door not closing on its own. You need to decide how much force is acceptable for closing the door.

The way it is designed in the ones that are sold, there is very little door holding force available due to the geometry.
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Old March 31st, 2016, 01:19 PM
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Originally Posted by Red90 View Post
Knowing the weights of that stuff, does not answer the question though. You need to work out the geometry of the strut. You need to know how much angle you are willing to deal with the door not closing on its own. You need to decide how much force is acceptable for closing the door.

The way it is designed in the ones that are sold, there is very little door holding force available due to the geometry.


I found a place that does the math for you. just need to plug the numbers in. hence the weight questions. placement is standard with a ~ 20" strut as I'm going to follow how the kits do it.
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Old March 31st, 2016, 01:32 PM
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Be careful of the required closing force. With this design, the closing force will be a fair bit higher than the open holding force.

The math the generic places will have will be for holding something up in the air, which is not what is being done here. How much of a side angle do you want it to stay open? How much force are you willing to use to close the door?
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