In need of the forum's help assessing a new idea...
06-15-2016, 07:37 AM
#61
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06-15-2016, 08:49 AM
#62
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Great and largely innovative concept! I recently purchased a set of jack point jack stands. They're awesome. I can adjust the height of the Jackpoint jack stands a bit with blocks underneath, but your height adjustable legs appear to afford a better solution.
The jack point jack stands however, while pricey, appear to be more solid than the hollow construction in your design. It's not uncommon for a floor jack to drop quicker than expected, and even a two ton jack can fail if a one ton load is dropped too quickly. And unlike the Jackpoint stand there's a potential for just one of the four legs to take the brunt of the load and fail. Just wondering if all of this has been thought through and fully tested...
The jack point jack stands however, while pricey, appear to be more solid than the hollow construction in your design. It's not uncommon for a floor jack to drop quicker than expected, and even a two ton jack can fail if a one ton load is dropped too quickly. And unlike the Jackpoint stand there's a potential for just one of the four legs to take the brunt of the load and fail. Just wondering if all of this has been thought through and fully tested...
In addition to that testing, we also wanted to see what would happen under unusual strains or gross misuse. We called it the "misuse factor" and set a goal of hitting a factor of 2 per stand which we accomplished. With that same 0.3 friction coefficient in place, we tested to see how the stands would hold if they came under load unevenly (tilted at an angle) with only two feet making contact with the surface to simulate what would happen if it came down on an uneven surface of a broken garage floor or a tool being left carelessly underneath the stand, and we easily met that factor of 2.
I don't know of any other jack stand designs that have been tested like this, and we believe it's a very solid design with a respectable load rating, even though the aluminum version only weighs in at round 23 lbs per pair.
Please understand also that I don't have a production version to directly compare to what's already being sold out there, as these are just prototypes, but I believe you will be very impressed with the production version when it makes its debut.
Thanks again for the question!
06-15-2016, 09:08 AM
#63
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Like it, like it a lot and would buy a set if they were for sale. I see a few comments on the pin, definitely over design it even though you might not need it. It gives a sense of security for fraction of the cost. Might consider a larger gap between the bottom of the car and the horizontal bar for a wrench to get at hidden screws or bolts. Nice to have them light and durable, aluminum or carbon fiber is good. Lastly looks and finish. I think most people would pay more for those, you are talking to the Porsche crowd.
06-15-2016, 10:01 AM
#64
Subscribed, this looks very interesting.
06-15-2016, 02:13 PM
#68
Rennlist Member
I appreciate the compliment! The legs are actually solid metal, and there are two per stand. To meet ANSI standards, each stand must be able to sustain 1.5 times the recommended load of the entire pair. For my lightweight aluminum version rated at 2 tons/pair, a single stand would have to sustain 3 tons, roughly 6000 lbs. We even pushed that by another 500 lbs to reach 6500 lbs per stand. By the way, this is using a friction coefficient of 0.3 which you can't really replicate in real life, unless you were maybe jacking the car on an oil covered piece of glass. So depending on the weight of your car, to hit the top of the jack with enough force to exceed 3.25 tons you would most likely have to drop it from a height exceeding the maximum height of your jack, and that's definitely not something I suggest doing with any jack stand.
I don't know of any other jack stand designs that have been tested like this, and we believe it's a very solid design with a respectable load rating, even though the aluminum version only weighs in at round 23 lbs per pair.
Thanks again for the question!
I don't know of any other jack stand designs that have been tested like this, and we believe it's a very solid design with a respectable load rating, even though the aluminum version only weighs in at round 23 lbs per pair.
Thanks again for the question!
06-15-2016, 05:08 PM
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06-15-2016, 06:59 PM
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06-15-2016, 07:09 PM
#75
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I think it's a great idea. I just spent $1,300 on a quick jack lift system to get basically the same benefits.
And I still don't totally trust it so I end up putting 4 jack stands under the platform for added safety.
The only additional benefit of the lift over your product is the ability to lift all 4 corners of the car simultaneously which was/is a concern for my F355. It seems those cars commonly suffer from cracking at the bases of the flying buttresses which is exacerbated by uneven lifting.
However yours has many additional benefits such as true portability, no need for power source, easier set up, more locking height positions and way cheaper cost.
I would definitely be a buyer at $150/pair $250-$275 for 4
I think you should reconsider the name to something with more universal appeal and that communicates the main benefit.
Rennjacks is too Porsche centric. You want to appeal a wider spectrum.
I happen to be in the automotive business and I think this product has commercial applications as well so keep that in mind.
I'd stay out of the Walmart's of the world because I think it would dilute the "professional grade" image you want.
Go through the more focused tool distributors.
And I still don't totally trust it so I end up putting 4 jack stands under the platform for added safety.
The only additional benefit of the lift over your product is the ability to lift all 4 corners of the car simultaneously which was/is a concern for my F355. It seems those cars commonly suffer from cracking at the bases of the flying buttresses which is exacerbated by uneven lifting.
However yours has many additional benefits such as true portability, no need for power source, easier set up, more locking height positions and way cheaper cost.
I would definitely be a buyer at $150/pair $250-$275 for 4
I think you should reconsider the name to something with more universal appeal and that communicates the main benefit.
Rennjacks is too Porsche centric. You want to appeal a wider spectrum.
I happen to be in the automotive business and I think this product has commercial applications as well so keep that in mind.
I'd stay out of the Walmart's of the world because I think it would dilute the "professional grade" image you want.
Go through the more focused tool distributors.