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Old 11-01-2019, 10:53 AM #1
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Engineering/Technical Assistance Needed

Hello all. I'm hoping to find somebody to help me rig up a pulley system to easily take my alu-cab RTT on and off my rig.

My vision is to drive under a gantry crane I bought specifically for this and use an electric winch to pull RTT off. Leave suspended on crane and then lower when I need it. Although there a giant wood beams in my workshop -- I don't want to connect hoist/pulley system to them as I want to be able to take the system to whatever space I might have in the future. I've looked at various garage systems, i.e. Racor, but I don't think they'll work given the ceiling height of my workshop.

So I need help figuring out the center of gravity on the winch system, a method of balancing the RTT and means of connecting it to hoist, a second or maybe even a third pair of hands to make this happen.

Open to suggestions for engineering this or references to people who do this kind of work -- but really want somebody local, with a free day to come to my workshop in Inglewood and help me with this. Happy to compensate you for your time with booze, food, and cash.

My shop is directly across the street from where the new stadium is going up.
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Icon Stage 2 suspension; Budbuilt Skid plates and rock sliders; Demello three-hoop front bumper with winch;
CBI swing out bumper with jerry cans, camp table & light; Goose Gear drawers & sleeping platform; Alu-Cab RTT/Shadow Awning; Prinsu rack with Heretic 40" light bar; Raingler nets; BF Goodrich AT K02 285 70/17; Dirty Parts dual battery kit; Prestigious Society Navigation Enhancement
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Old 11-05-2019, 12:56 PM #2
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It's going to heavily depend on the load and the structure of the building.

Those rafters or beams are typically in tension between the walls, and not typically laterally loaded.

You may need some sort or reinforcement, like sistering, kneewall, collar-ties, etc.

The Racor style distributes the load over a larger area than say just mounting a winch and few pulleys.

You would need to hire a PE for this or at least someone who can do load calcs.

That's assuming you're going to get a permit of some sort.
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Old 11-05-2019, 03:45 PM #3
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Everything posted above is solid advice.

Pics of the space would also be very helpful.
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Old 11-06-2019, 01:03 PM #4
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Quote:
Originally Posted by Captain Planet View Post
It's going to heavily depend on the load and the structure of the building.

Those rafters or beams are typically in tension between the walls, and not typically laterally loaded.

You may need some sort or reinforcement, like sistering, kneewall, collar-ties, etc.

The Racor style distributes the load over a larger area than say just mounting a winch and few pulleys.

You would need to hire a PE for this or at least someone who can do load calcs.

That's assuming you're going to get a permit of some sort.

Not connecting to building. Bought a 1000lbs rated gantry crane solely/specifically for this.
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Icon Stage 2 suspension; Budbuilt Skid plates and rock sliders; Demello three-hoop front bumper with winch;
CBI swing out bumper with jerry cans, camp table & light; Goose Gear drawers & sleeping platform; Alu-Cab RTT/Shadow Awning; Prinsu rack with Heretic 40" light bar; Raingler nets; BF Goodrich AT K02 285 70/17; Dirty Parts dual battery kit; Prestigious Society Navigation Enhancement
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Old 11-06-2019, 02:46 PM #5
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Quote:
Originally Posted by alirawk View Post
Not connecting to building. Bought a 1000lbs rated gantry crane solely/specifically for this.
Pics would help. Just my thoughts below.

How much clearance is there between the gantry connection point(s) and your rtt? A simple 5 to 1 rope pulley would reduce the load enough that you shouldn't need a winch. Going to need to an anchor the rope properly.

I could see 4 eye bolts installed to the rtt to keep it from rolling over. Rope from each eye bolt to the base of the pulley. A tag line to keep the load from rotating would probably be needed. Also is the gantry mobile or fixed to your floor? GLHF
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Old 11-08-2019, 11:43 AM #6
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Quote:
Originally Posted by El Dusty View Post
Pics would help. Just my thoughts below.

How much clearance is there between the gantry connection point(s) and your rtt? A simple 5 to 1 rope pulley would reduce the load enough that you shouldn't need a winch. Going to need to an anchor the rope properly.

I could see 4 eye bolts installed to the rtt to keep it from rolling over. Rope from each eye bolt to the base of the pulley. A tag line to keep the load from rotating would probably be needed. Also is the gantry mobile or fixed to your floor? GLHF
I will try to take pics soon -- I actually took the gantry crane apart and have to reassemble soon to actually do this. Again, part of the reason I posted here was in hopes of finding somebody local to hire to help pull this off.

I'm not too keen on drilling holes in the RTT. I'm thinking of perhaps stringing some webbing or webbing wrapped around cable under it, to then connect to the hoist. When I put the system together in the first place, I bought extra cross bars for the roof rack specifically to permanently afix to the RTT, so I could simply take of those bolts, lift the RTT up and then lower back when I wanted to use.

I suppose, I mostly need an extra hand with a little bit of patience and engineer insight who wants to make a little cash for a few hours of help.
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CBI swing out bumper with jerry cans, camp table & light; Goose Gear drawers & sleeping platform; Alu-Cab RTT/Shadow Awning; Prinsu rack with Heretic 40" light bar; Raingler nets; BF Goodrich AT K02 285 70/17; Dirty Parts dual battery kit; Prestigious Society Navigation Enhancement
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Old 11-08-2019, 01:50 PM #7
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Quote:
Originally Posted by alirawk View Post
I suppose, I mostly need an extra hand with a little bit of patience and engineer insight who wants to make a little cash for a few hours of help.
Here's a product that you could try as well. You could mount this to your gantry but may need longer straps?

Amazon.com : VIVOHOME Heavy Duty Ceiling Mount Bicycle Kayak Canoe Garage Storage Lift Hoists Pulley System 125lbs Capacity Pack of 2 : Sports & Outdoors
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Old 11-08-2019, 01:52 PM #8
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Weight of the RTT?
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Old 11-17-2019, 03:55 PM #9
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I'm a licensed professional engineer (mechanical). I would build a gantry on casters from wood. Should be easy to assemble/disassemble and cheap to build. I would use multiple manual pulleys. Simple and effective
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Old 11-18-2019, 09:36 PM #10
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Kiss

I like this guy's approach for $40. Kayak hoist.

A Simple $40 RTT Storage Hoist!
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Old 11-19-2019, 10:56 AM #11
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Quote:
Originally Posted by Transient View Post
Weight of the RTT?
RTT plus the awning which attaches to the RTT comes close to 200 lbs. As such the kayak hoist won't work.

Now thinking I'll forget the whole gantry crane thing and connect directly to the rafters. I believe they are 4 by 12. With some support they should be fine. Thoughts?
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Icon Stage 2 suspension; Budbuilt Skid plates and rock sliders; Demello three-hoop front bumper with winch;
CBI swing out bumper with jerry cans, camp table & light; Goose Gear drawers & sleeping platform; Alu-Cab RTT/Shadow Awning; Prinsu rack with Heretic 40" light bar; Raingler nets; BF Goodrich AT K02 285 70/17; Dirty Parts dual battery kit; Prestigious Society Navigation Enhancement
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