It's made from PETG, all the files are the RCshipyard.com website.

No, you really need an efficient pump with how flow. If you want to use the peristaltic one - go with the bladder system.

The STL files for the stern are available for free to download at www.RCshipyard.com. If you need a ready to go printed version send me an @ via the contact form on the website. Good luck with the Krick!

@@RCShipyard Hi, I see you have started new project for the 1/144 PLAN Type 092 model. Are you planning for new WTC, or using your Seawolf WTC? I'm keen to purchase this kit tho...😉

Hi, can you share where you get that rolling pump? Or do you sell them?

@@MLOO123 ​ @MLOO123 The pump is a gear pump, not a rolling pump. It's a 12V Graupner pump and can be obtained on various online shops. I don't plan to be selling those. The Plan 092, will have a longer WTC than the seawolf.

Thanks for reply and information on the pump and 092. Are you using 2S battery for the 12V pump? I do have a larger graupner 6V gear pump in white casing, but don't seems have good flow than yours after trying out your demo...

It's a closed unit, not possible to peek inside, but it's a simple gear pump - so two gears sucking in water.

@@RCShipyard thanks. I just wanted to know what type of pump it was, I what to try and 3d print it.

Aliexpress.

The one from the krick type 96 dive kit

It's actually not innovative, this is a classic solution for a ballast tank system in a RC submarine, just with some modern electronic elements instead of mechanical. I suspect you may not have watched the video till the end or not carefully enough, as the matter you mention has been precisely addressed and explained in the video. The key to resolving your doubt is the difference in density of water and air, together with different diameters of the water inlet and snorkel tubes. This exact system has been used in one of my models during season 2021 and allows for resurfacing from around 2 meter (6 feet) of depth. For bigger depths, a stronger pump is required.

@@RCShipyard here´s a comment from Germany, so you have to excuse my poor englisch. The "stronger pump" you use must be a gear pump, isn´t it? so, a gear pump doesn´t keep tight while standing, there´s always a little flow of water or air, so it´s nearly impossible to hold the boat hovering in middle depth. But there is a good solution on the site of "neitosub" - rc submarine project Type II u-boat - introducing his solution with a mechanical valve which simultaneously commands the pump-servo. this is very easy and without additional electronic stuff, especially für gear-pumps.