Love the hold my beer vibes.

Hi how much concrete did you use per hole?

So I have two decks 85' apart form each other in the back yard. One is 6' 6" from the ground to the deck floor and the other is 6' from the ground to the deck floor. On top of these decks are little buildings that are 7' tall at the tallest points. Do you have any advice on the length of post/board and how deep to bury it to support riders of 250 lbs or less? Also, how should I mount the zipline to the beams/boards/posts? I see your mounting here, but given my spec not sure if it would change your advice. Thanks!!

I’ve build 1000 feet long zip line with 5/8 cable. Is diameter sufficient? Thank you !

Hell ya I was thinking this exact same solution. Your the man Not sure I’ll get all the math perfect but it will be better than nothing

🤔🫨😵‍💫🥴

Just purchased 2 off treated 3x12 for the same

That is by far the best brilliant method I've seen to level an above ground pool, like the water level technique.

Where did you get the foam? Thanks

This is my zipline with iron posts kzbin.info/www/bejne/aIaxfoh7Z9CfbpIsi=nNBM88AatwY9El5q

Do you feel that there is a tolerance level between the bottom of the built up feet and the floor itself that the liner can handle? If assume the liner is designed to be installed at the same level as the feet.. thanks

Was looking for a low cost simple solution and you sir nailed it gonna get some foam panels and start getting things prepped. 2 years later and your video still helping people!!

how about a video or ideas for a rectangle pool on the patio

We only have a two inch slope over an eight foot distance. I'm wondering if it's worth leveling for our eight foot pool or just setting it up and seeing how it goes 😅

Awesome video. I've used foam board on my 16 ft diameter 52 inch deep pool and it works great in my yard on the topsoil, makes for a nice soft bottom. *Twss*😂 I'm especially intrigued on hearing how your foam board only compressed 1 to 2 mm at the legs. I've had soil compression over the last 3 years, also erosion under the edge at the low point. I'm looking at releving it at the end of this summer and have at least a 1 ft perimeter beyond the pool's edge to eliminate invasive Bermuda grass around the legs. It looks like the inch thick foam could withstand the 52-inch water depth, especially if I pre-compacted the perimeter. I appreciate the engineering in your approach. The only question is did you see any appreciable deflection around your circumference due to your wedges? Thanks and God bless

Hi. You assumed at 1:40 that the rider is gonna drop 4ft over a 90ft run. Why did you assume 4ft? Is that from the sloap of your yard that is 4ft and bems at 8' tall?

Where are you located? I need this made, but no tool to make it. Same exact pool too.

do you need to consider the weight of the cable in the force applied to the end points? 100ft of decent cable is pretty heavy.

I had no doubt you were 100% an engineer lol all the same demeanor

Was a fun day, My wife @ I were there that day. Thank you Allegheny College, GO GATORS

Thanks for this video! Exactly what I'm going to do/try

Great explanation! Did you look at using alternate materials such as steel or aluminum posts with or without guy wires?

Nice video! Did you look at using a steel post(round or square) & either burying or bolting to concrete? Tks

As I watch your calculations (with gratitude and fascination, trying to relearn the math!) I realize that if the downward deflection is between 3 and 4 feet (37.5" to 48") our IBC tank anchored zipline system isn't going to be all that successful given that an IBC tank is only 3 feet tall and we would be putting the cable sling somewhere lower than that... Hmmm. A failure? Or can we increase the tension (since nobody will be riding on it but it will be used for transporting cacao pod baskets). Any ideas?

I'm am trying to model our proposed solution using Blender 3D physics simulations and animations -- great to see you using Sketchup!

Marvelous!!! On behalf of me and all our students trying to apply ziplines without trees to impoverished communities in the highlands of Columbia we thank you!

God bless you for sharing this and taking the time to answer everyone's questions so clearly and patiently. I'm exploring ways to help two campesino families in the highlands of Sopetran, Colmbia get their cacao pods up the slippery mountain safely where there are no trees big enough to anchor to (the cacao trees are small diameter) and where it is hard to dig or get materials up and poverty is rampant (this is part of our mission at Mercy University and at the Patel College of Global Sustainability). We are thinking of trying to use fertigation water filled IBC tanks (1 ton) as the anchors and are experimenting in Florida at the Rosebud Continuum Eco-Science Center, but as we are not an engineering college (more of an interdisciplinary policy college) we have a lot to figure out. Thanks so much for your experiments and experience in zip lines without trees and anchors!

Was going to use galvanized steel poles over wood posts , any thoughts?

Hey buddy im not an engineer just a dad and Grandpa, did you use the same 2x12 on both ends ? I see you did say you went 4 ft in the ground that would make both ends exact size and in the ground correct, now my question is how high did you go at the start from the zipline and how low at the end ? im not an engineer but this is wat i need to do for my grandkids, thanks so much looks awesome

Thanks for sharing good idea to sister two 2x12

Thank you for this video! Thanks for sharing your knowledge! Very helpful!

Thank you for this video! It is awesome that you use your engineering knowledge to make fun activities for your kids. And it is amazing that you took the time to share that knowledge with other people. It wouldn't have been possible for our family, or many other families, to make a zipline without your video. We are going to be making the zip line with 2x12x16s, that will cantilever 12 ft above the ground. According to the equation from the calculation video, a 300 lb individual, would cause the 12 beam to deflect 3 in. Or 2 in if I used a 3 ply beam. I don't know if that's an acceptable amount of deflection. It certainly is not acceptable for building code. I think that works only allow 0.8 inches. But is it a dangerous amount of deflection? Could the beam fail? I looked up the modulus of rupture for sy pine (12,800 PSI when dry). I don't believe the force from the zipline is anywhere close to that, even for a 300lb adult at the 12' cantilever (7,500 Newtons? Or 48 psi for the 2-2x12?). I don't understand the math well to be sure I am doing it right. I also don't know when the amount of deflection (1-3") should be concerning. Thanks again for your video!

Nice Safety sandals

How in the world does the foam withstand such a massive amount of weight from the water without seriously denting the foam? Makes no sense... Would using EPS foam instead of XPS work just aswell? The XPS foam feels more rigid than EPS, EPS feels more squishy to me.

Hi, I have artifical grass on gradual slope 4 inches. I had my 14 ×42 intex pool up. The poles on cinder blocks. The the sides of pool were bulging quite a bit. I emptied the pool. I was thinking of stacking eps foam to level it or do blocks and then the foam. It is just me and my sister and a limited budget. We have two months of hot weather left. I really want to put the pool back up🎉thanks for your time

Thank you Ryan, you answered all doubts..Dan

Very cool process, thanks for sharing, something to keep in the back pocket for sure!

At first I was dubious, but your underwater footage sold me. Based on your experience, when installing an AGP on soil, I wonder if dishing out the central area, say 8-10" while leaving the perimeter level and flat would work, to make a center 'deep end', say for a 48" deep 18' pool? The liner appears to be flexible and 'stretchy' enough to compensate for the dish, and the perimeter being level would be the only concern since the legs would have a flat footing. The goal would be to let your 48" pool be actually 58" deep in the center...

How well is the foam standing up under the legs? Thats my one big worry@ !

Hi there, I think this is ingeniously done, thank you for posting. We are planning putting our Intex pool up on an asphalted backyard area, the pool is 15 x 48 and has no poles in it, just a blow up rim at the top. We have a 5.75 “ slope. I don’t know if no poles would require any further consideration or extra concern in our instance using this method?

You mentioned its 38 5/8 across on one side, 30 inches on the side of the first foam board. How about the last side?

Don’t worry guys. It’s not rocket science 😵‍💫

I am going to write numbers because writing down in inches is too complicated. If only there was a system that divides by 10. Like a centimeter or so.... oh wait.

Key point to note - this is one of the smaller 12' x 30" pools. Plenty of weight to distribute but nothing compared to the larger 40"+ height pools that start at 15 feet. I wonder how a solution like this would hold up under an 18' x 52".

So is there steps in the pool!??? Like from the foam?

Do you think cutting foam to bevel edge is required. I don't own a table saw. Also my pool is oval if that makes a difference.

So you don't suggest placing any foam in the middle of pool or completely covering foam underneath the pool? Another video they placed foam underneath the entire pool. It seemed you focused mainly on the legs. So as long as the legs & outer perimeter is leveled that will level the water in the pool?

I love using the water level for things like this! I always add a little bit of food coloring to the water. It makes reading the measurements a lot easier. Great video!

This is so me. Dare to be different yes!!!❤