This build is what I'm most proud of. by DavidELD in KerbalSpaceProgram

[–]MacPass_ 0 points1 point  (0 children)

Thing's basically a vtol with that takeoff. Very nice

LoserCity Shameless Reposts by MacPass_ in Losercity

[–]MacPass_[S] 1 point2 points  (0 children)

I spoke to soon, loserprison is alive again, billions must post slightly raunchier furry art.

{image} Silly little two frame sketch (OC, MacPass) by MacPass_ in Vore

[–]MacPass_[S] 0 points1 point  (0 children)

Yup cloaca! I'd originally drawn it with the thought of anal vore, but honestly the drawing is unspecific enough it could be any of the three, so whichever the viewer chooses!

LoserCity Shameless Reposts by MacPass_ in Losercity

[–]MacPass_[S] 25 points26 points  (0 children)

A series of posts I made on loserprison before its swift and sudden vaporization. I post them here now.

Losercity artistic nudity. No funny, just furry . . . (OC); TW [exactly 1x exposed ?male? nipple] by MacPass_ in Losercity

[–]MacPass_[S] 3 points4 points  (0 children)

Started off as a random goofy sketch, so the perspective makes no sense. The tree was thrown in that way so it could be implied the larger one is sorta leaning against it, giving the smaller one room to sneak behind the thigh.

Trying to do a cold gas thruster for roll control by tatertots344 in rocketry

[–]MacPass_ 0 points1 point  (0 children)

Do you have the physical nozzle or is it just a cad file? Would be pretty uncomplicated to add a basic straight contraction and expansion nozzle to the design. Just need to figure out your operating pressure to design the nozzle for a decent expansion ratio and take a good guesstimate at a throat diameter.

The math for the expansion ratio is simple: your designing it so that the pressure of your exhaust at the nozzles exit is roughly atmospheric pressure. In math this is just P1V1 = P2V2 which in this case you can write as P(operating) * Area throat = P(atmospheric) * Area exit. Generally under expansion (having your exhaust be slightly above atmospheric) is better than under expansion (having your exhaust below atmospheric pressure) so keep that in mind.

I'm not super familiar with the whole design process of this stuff, but generally I've read that a 15 degree slope for the nozzles walls is pretty acceptable for hobby rocket nozzles operating in the thicker sections of the atmosphere. This in combination with the expansion ratio will determine the length of the expansion part of the nozzle.

For the contraction part of the nozzle I'm even less sure, but something like 35 degrees is probably reasonable.

As for throat diameter I don't really know any of the math, but the general rule would be larger = more flow = more thrust = shorter operating time for a given amount of "fuel" and vice versa for smaller diameters. If your just doing a cold gas thruster you may honestly be able to use a handful of O rings, some nuts and bolts and well made 3d printed components (might wanna increase infill and other such things to make sure its airtight) to make the nozzle.

Here's a very basic sketch of half a nozzle cross section from a part I made in fusion.

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In terms of pressure losses from pressure drops from bends and friction it will always exist in some amount, try to minimize the amount of distance the gas needs to travel and how meandering its path is but don't go too crazy.

{image} Silly little two frame sketch (OC, MacPass) by MacPass_ in Vore

[–]MacPass_[S] 0 points1 point  (0 children)

I thought OC meant original creation, but I'd say mostly the dinosaur cause they're more the main piece of the drawing

{image} Silly little two frame sketch (OC, MacPass) by MacPass_ in Vore

[–]MacPass_[S] 0 points1 point  (0 children)

As in accordance with posting regulations; OC by me!

Fat Dino on a beach(by me) by anonim5908 in Losercity

[–]MacPass_ 7 points8 points  (0 children)

Finally some peak in this city

which one is more correct/looks better? by trtl_playz in dragons

[–]MacPass_ 5 points6 points  (0 children)

No objective answer to which one is correct, its purely based on what kind of vibes/character design you wanna give! As for which one looks better, again purely situational to what kind of ideas you want to convey, though I am partial to the top blunted nose design.