sbradford26 (u/sbradford26)

sbradford26 commented on How NASA brought the F-1 “moon rocket” engine back to life (2013) arstechnica.com/science/2... · Posted by u/lifeisstillgood

capitainenemo · a year ago

But with more engines they can tolerate a failure or two (or even more) per launch. If a larger engine fails and you only have 3 of them, you're going to have a bad day.

And, they do seem to test the heck out of their engines, even with 30 of them on a ship.

sbradford26 · a year ago

Yes those benefits can now be realized now with modern controls. Back when the Saturn V was designed the control systems necessary to manage 30 engines didn't really exist. Digital control was in it infancy and was only really implemented with a backup on the whole Apollo stack.

Trying to manage that many engines while technically possible with controls of the era (check out the N1) means your control system would be introducing reliability issues instead of adding fault tolerance through redundancy.

sbradford26 commented on Spray-foam insulation makes homes unable to be mortgaged theguardian.com/money/art... · Posted by u/vasco

jordanb · a year ago

Closed cell foam will trap moisture underneath it. When sprayed on wood which is naturally moist that water will have nowhere to go. Any delaminations of the foam from the substrate will form pockets where wet will concentrate, and as the foam breaks down it becomes acidic.

If I were to sprayfoam something I would only consider using open cell foam. If I were to use other impervious zero-perm insulation materials like rockwool I'd only do so with dimple board to allow air underneath. The small loss of efficiency is a necessary tradeoff for giving the moisture which will always be there a path to escape.

sbradford26 · a year ago

Spray foam doesn't remove the need for a designing a proper insulation and moisture barrier system for the building. If you spray foam an interior wall with closed cell foam you most likely will add something to allow the other side of the wood to breath.

Choosing where your moisture barrier line lies is typically easy in new construction but does get tricky with retrofit situations. It sounds like the biggest issue from the article is that they are taking what were vented attics and converting them to non-vented attics with spray foam. The issue isn't really the spray foam, the issue is converting an attic without proper understanding of venting and moisture barriers.

sbradford26 commented on Spray-foam insulation makes homes unable to be mortgaged theguardian.com/money/art... · Posted by u/vasco

simfoo · a year ago

I'm into watching construction videos on Youtube, and since most of the content originates from the US I see lots of people using spray foam insulation without any sort of air-tight & moisture regulating membrane on the inside (behind the drywall for example). This is a disaster waiting to happen in almost all northern climates during winter (when AC/de-humidification isn't running) for the same reasons outlined in the article here.

sbradford26 · a year ago

It depends on what type of spray foam you use. Closed cell foam is rated to be a moisture barrier. It tends to be more expensive but is worth it to get a moisture barrier and insulation in one. In some scenarios where you need much thicker insulation to hit your desired R value they might start with closed cell for the moisture barrier and then switch to open cell since it is cheaper.

sbradford26 commented on How French Drains Work practical.engineering/blo... · Posted by u/chmaynard

seanalltogether · a year ago

One thing I regret after moving into my new house was not getting a detailed list of drains installed in the property. I have lots of drainage issues and don't know if there is a drain there but inadequate for the amount of water we get, or just not installed at all.

sbradford26 · a year ago

A major lesson of home ownership is that it is a continual fight against water. Keeping water away from places you don't want it, and keeping water in and available in the areas you do want it.

sbradford26 commented on How French Drains Work practical.engineering/blo... · Posted by u/chmaynard

ec109685 · a year ago

I don’t think it qualifies. This drain is intentionally named after Mr. French.

sbradford26 · a year ago

The would be the whole reason of it making the list. Most people would think it was named after the country or something not Mr. French.

sbradford26 commented on We've built the Ultimate e-Bike Battery that you can Repair and Refill get.gouach.com/2... · Posted by u/oulipo

kotaKat · a year ago

If you’re finding 18650s in bulk so cheap that $48 fills the entire pack, I’d be amazed.

sbradford26 · a year ago

$48 would require some pretty large order quantities and probably low end cells.

https://www.18650batterystore.com/collections/featured-produ...

Currently that is the lowest price I can find for a cell at low quantities, that puts it at $62 to fill the pack which is not too far off. Looks like you would need a 33% discount on those cells to get to $48 which is within the realm of possibility if you purchase in large volumes.

To get a decent quality samsung cell you are looking at $118 to fill the pack. https://www.18650batterystore.com/products/samsung-30q

sbradford26 commented on Toyota Reveals Maverick-Sized Electric Pickup Concept We've Been Waiting For thedrive.com/news/toyota-... · Posted by u/PaulHoule

tfandango · 2 years ago

That is why I'm replacing my SUV with a Tacoma (other than that the SUV blew its engine). I tend to move a lot of outside stuff and with the Jeep I was making many trips with lots of buckets. Now I will be able to let them just dump a pile of mulch in the back and then just spray the thing out.

sbradford26 · 2 years ago

Yeah that was the main driver for me ordering a Ford Maverick. I has an Hyundai Ioniq before, and a BMW X3 before that. I am well aware of what can be moved in a sedan and an SUV, but it is much easier to move those things with my Maverick. I renovated most of my bathroom with Ioniq, but had to rent/borrow vehicles to get drywall and such. I recently finished my kitchen with my maverick and was able to move everything with that. Also it was 31.5K new and gets 40 mpg on average, the only real compromise was the lack of AWD. Which I make up for with snow tires.

sbradford26 commented on Toyota Reveals Maverick-Sized Electric Pickup Concept We've Been Waiting For thedrive.com/news/toyota-... · Posted by u/PaulHoule

samsolomon · 2 years ago

Canoo is trying something like that. It's a pretty utilitarian looking vehicle. Deliveries are supposed to begin by the end of this year. Not sure if that's still the case.

https://www.canoo.com/pickup/

sbradford26 · 2 years ago

The Canoo looks pretty awesome. If ends up being good, it will be a decent competitor to the Ford Maverick. I will say though that they did the same trick as the VW Buzz. They extended the windshield down to the very front of the vehicle, but the driver is still sitting behind the front wheels.

sbradford26 commented on Toyota Reveals Maverick-Sized Electric Pickup Concept We've Been Waiting For thedrive.com/news/toyota-... · Posted by u/PaulHoule

arprocter · 2 years ago

I'd like to see someone make a cab-over EV truck - dump the frunk for a longer bed and/or more legroom

If it's a crumple zone thing, VW seem to be managing with their new bus

sbradford26 · 2 years ago

So VW mostly "got rid of" the crumple zone on the VW Buzz through visual styling.

https://www.cnet.com/a/img/resize/e4948b43b5a2e77ce3119ebe70...

If you look at that picture you can see the steering wheel and the drive is behind the front wheels. They just extended the front windshield to give the same look at the older vans.

sbradford26 commented on Toyota Reveals Maverick-Sized Electric Pickup Concept We've Been Waiting For thedrive.com/news/toyota-... · Posted by u/PaulHoule

i_am_proteus · 2 years ago

- Carrying anything truly dirty and hosing out the bed later

- Carrying oversized items (tall) with proper tie-downs

- Carrying oversized items (long) with proper tie-downs and lights/flags

sbradford26 · 2 years ago

I recently demoed an old hot tub that came with out house which ended up having a bunch of mice nests in it. Took it all the transfer station then just hosed all the mouse poop out of the bed out afterwards, and was able to help a friend move a couch the next day.