totm june 2018 Work-in-Progress [WIP] Design Thread

[Jetenginestar]

Btw sgt_flyer, I pushed your propeller engines to another level

So how many parts is it now?

Was looking huge before you had it in the air lol

721 parts without passenger seats. She'll be better off as a Liquid Fuel freighter or a Combi...

[sgt_flyer]

Well, it seems that the top speed is limited by - basically - the number of ASAS units making the propeller and the friction. I tried some designs with only 3 wheels on each end, they are faster, but unstable (whereas the 4 wheel design can be pushed to x2 acceleration - at least on a single engine and twin engine i tested ).

With the 4 wheel design, a small single engine design with the 3 bladed propeller can reach around 40m/s with 8 asas, and around 50m/s with 12 asas.

Quick note for multi engine aircraft - you should be able to add a few 'brakes' from the bearings landing gears to an action group - it will slow down or even stop the engine (if enough at the same time) without needing to switch vessels inflight.

(Don't attempt to use brakes on a single engine design though as the torque is not cancelled ^^)

Edited August 31, 2014 by sgt_flyer

[Roflcopterkklol]

Btw sgt_flyer, I pushed your propeller engines to another level

http://youtu.be/MehJhSFXfzE

721 parts without passenger seats. She'll be better off as a Liquid Fuel freighter or a Combi...

Damn it is more parts than titan lol, gotta love it.

Look forward to when it is finished.

On a side note i finished my SSTM's

Next step is making them into VTOLs.

Edited August 31, 2014 by Roflcopterkklol

[Darth Lazarus]

testing a new payload for my Soyuz-Fregat

Landing scheduled for tomorrow afternoon

[Roflcopterkklol]

Success!

Hmm it has brought the centre of mass down a lot though (This engine is perfectly balanced otherwise)

Thinking i should make a completely new engine pack with the rapiers built into the middle.

Ill get on it i guess.

Edited September 1, 2014 by Roflcopterkklol

[Roflcopterkklol]

Question guys what would be better because i am at an odds, Should i make this VTOL need the rear engines to fly or have it so vertical take off is all?

I can not get it to be flyable with vertical engines going and have it be completely stable with only the vertical engines on without needing RCS to control the vertical lift, the opposite is you can not turn the rear engines on until you are in the air and you need to kill the vertical engines otherwise it will flip forward.

Thoughts?

Edited September 1, 2014 by Roflcopterkklol

[soulreaver1981]

Question guys what would be better because i am at an odds, Should i make this VTOL need the rear engines to fly or have it so vertical take off is all?

I can not get it to be flyable with vertical engines going and have it be completely stable with only the vertical engines on without needing RCS to control the vertical lift, the opposite is you can not turn the rear engines on until you are in the air and you need to kill the vertical engines otherwise it will flip forward.

Thoughts?

In the hangar you can turn the trust of you horizontal to 0 than you can find the center of lift for your vtol engine's

[Roflcopterkklol]

In the hangar you can turn the trust of you horizontal to 0 than you can find the center of lift for your vtol engine's

Oh i have the centre of lift, i just wanted to know which way was better, Ended up summoning wizards and found a way around both problems.

[sgt_flyer]

ok, after the experimental K-25, it's been itching me a lot

i needed to build a bigger airplane (intended to be powered by 4 of the latest stable torque engines i managed to create)

here's a WIP of the K-29

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currently, the fuselage is built, with a fully working bomb bay (still have to undergo flight trials though )

the bomb bay house 12 bombs

i still have a lot of work on the wings design (as i need to keep a 'cut' in the wings for the engines placement)

edit : finished the bomber - it barely flies, but it flies and the bomb bay fully works (the torque engines TWR is not really helping, as you need a huuuge amount of wings to fly at low speeds )

http://forum.kerbalspaceprogram.com/threads/92798-K-29-bomber

Edited September 3, 2014 by sgt_flyer

[Giggleplex777]

I've been experimenting with the configuration of the propellers and this is the best layout so far:

Three blades with swept surfaces.

Edit: Sgt_flyer: Is that a new bearing design? You should swap the blades out for mine. They create a bit more thrust than the straight blades and can go slightly faster, too.

Edited September 3, 2014 by Giggleplex777

[maccollo]

Got my new Venus lander ready

Decided to go with solids for the first 3 stages. The reason being that you now only need about 12.8 km/s of delta V to get to orbit from sea level. As a result my Venus ascent vehicle shrunk from 600 to just over 200 tonnes, which is not nearly as epic, so I added solids to get some of that mass back.

Edited September 3, 2014 by maccollo

[sgt_flyer]

ok, here's an experimental Torque engine with a dry bearing i tried to make, to find a way to limit the size of the thing compared to a landing gear bearing based engine. (downside is, it has higher part count, shakes more than a wheel based bearing (which eats a bit of it's top speed) and it's slightly heavier. (basically two more M-Beams of weight)

so if people want to tinker with it, feel free

here are the .craft files - you can open them in the vab or use them directly as perfect subassemblies - the root part is the ASAS at the bottom of the engine.

there are two engines, 1 mounted with a counterclockwise propeller, the other one with a clockwise propeller.

those are 127 parts engines - so multi engine aircraft will see their part count go up fast

Counterclockwise Engine : http://www./view/ecgfgl3tlfcvga9/CCW_engine.craft

Clockwise Engine : http://www./view/7gyke9qofo3nmxz/CW_engine.craft

(if you need to mirror those engines, i'll advise to mirror a mounting point, then putting one subassembly at a time on your mirrored mounting points - less risks for a .craft corruption)

Edited September 3, 2014 by sgt_flyer

[Frozen_Heart]

Working on a Minmus rover... turns out it has no traction despite working on the Mun brilliantly.

[xoknight]

ok, here's an experimental Torque engine with a dry bearing i tried to make, to find a way to limit the size of the thing compared to a landing gear bearing based engine. (downside is, it has higher part count, shakes more than a wheel based bearing (which eats a bit of it's top speed) and it's slightly heavier. (basically two more M-Beams of weight)

http://i.imgur.com/xaX8u6R.png

so if people want to tinker with it, feel free

here are the .craft files - you can open them in the vab or use them directly as perfect subassemblies - the root part is the ASAS at the bottom of the engine.

there are two engines, 1 mounted with a counterclockwise propeller, the other one with a clockwise propeller.

those are 127 parts engines - so multi engine aircraft will see their part count go up fast

Counterclockwise Engine : http://www./view/ecgfgl3tlfcvga9/CCW_engine.craft

Clockwise Engine : http://www./view/7gyke9qofo3nmxz/CW_engine.craft

(if you need to mirror those engines, i'll advise to mirror a mounting point, then putting one subassembly at a time on your mirrored mounting points - less risks for a .craft corruption)

Does 3 blades perform better than say 2 or 4?

[sgt_flyer]

Well, between the tests me and giggleplex did, it seems close to the sweet spot - lower number of blades allows for a higher RPM (better possible top speed) but lower thrust. (And those engines are heavy : p) + higher rpm will make those engines more unstable.

4 bladed engines have less RPM, higher thrust but lower top speed (requiring more wings to fly at those lower speeds)

When the differences in speeds are only a coupler of m/s, the inconvenients become to offset the gains

The most effective way to gain speed is to have more torque to drive the engine - to overcome the countertorque created because the propeller wants to act as a turbine

Basically, a propeller let on free run on a moving aircraft will naturally turn in reverse - when you approach your top speed, the forces between the 'turbine effect' and the generated torque tend to equilibrate.

Edited September 3, 2014 by sgt_flyer

[andrew123]

The USS Wasp, my precursor to the USS Nimitz. This prototype is not easy to complete.

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Also, the two cockpit AV-8B R2. This new revision has hidden VTOL engines, better aerodynamics, and better handling. These modifications are for carrier ops on the USS Wasp and eventually the Nimitz.

Harrier squadrons will serve trial deployments aboard the USS Wasp.

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Edited September 4, 2014 by andrew123

[Darth Lazarus]

increasing the number of russian/ukrainian rockets. still workinmg on teh Angara, i build in the meanwhile a 2 stage Zenit. in scale with my Proton and Soyuz and can lift 13,5 tons to LKO

i think i will set up a thread with all my russian / ukrainian rockets ... hrm ...

edit: test mockup of an Energia with 4 Zenit boosters ... 2 orange tanks to LKO ... O_o

Edited September 5, 2014 by Darth Lazarus

[sgt_flyer]

a little something i'm finishing to escort my K-29 bomber , equipped with my latest torque engine design

and frankly, this Y-38 Thunder (i wonder where i went searching for this one's name ^^^^) is absolutely amazing to fly around

[Overfloater]

Hey @Maccollo, is your Venus lander still gonna do this?

@sgt_flyer you make very good planes :-]

[WooDzor]

enough dv to make it back?

[EladDv]

meanwhile in the Maya Class building facility:

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5259 parts and counting!

it will be welded into the elevator and a separate hull

also its 120 meters long. the first photo is in the normal SPH and the others an extended hangar

[Roflcopterkklol]

So i decided to start a new science career and this is what i ended up using for my first mun landing mission.

Seems a bit over the top, over 1000 parts, goes to the mun, lands and comes back to kerbin no worries.

I did add orbital science to the game because moar science and all that.

(I cant figure out how to post an album so suffer the picture avalanche, if someone can explain how that works lol, annoying me because i have posted albums before.)

Edited September 5, 2014 by Roflcopterkklol

[GusTurbo]

Some updates for my Saturn V replica:

[Darth Lazarus]

Zenit 2 - 13,5 tons to LKO

Zenit 3 - 6(+) tons to keotransfer orbit with Blok D

Energija - ~80 tons to LKO (core needs to be wider)

[Jetenginestar]

Last phase of the test flight program, the high altitude flight tests...

All I need now is a cinematic for the craft and I can release it Final part count is 722.

Size comparison between ArcticAstrophysics's 747 and mine... Smaller but more parts

Edited September 6, 2014 by Jetenginestar