Your least used part

[Merinsan]

and this

This is my new favorite part. The amount of science it gets you is insane!

[Mephane]

My least used parts are those two

- Engine Nacelle, because of its unwieldy shape not really fitting into any horizontal or vertical stack.

- Radial Engine Body, because it is both useless and ugly.

[Sesni]

What Mephane said.

But rocket-wise, I think the Mark 55s, the LV-1 and LV-1R, and the double sized tanks.

[AmpsterMan]

Wait....that engine pylon is a DECOUPLER? Dang...I learn something new every day.

Yeah. It's intended purpose is presumably for use as drop tanks. The problem comes at the fact that the pylon is like half a meter high and fuel tankd are 1.25m diameter. There fore, it is impractical in its intended use.

[SunJumper]

I don't use RCS, in lieu of torque and engine gimballing. I don't use the LV-T30 (anymore), nor the Aerospike, nor the first radial decoupler (I use the one that is about 50kg lighter). I hardly use the 2m parts, or the seats (as you can't node mount them). Come to think of it, I hardly use any of the plane parts. Or the SAS.

[lajoswinkler]

I don't use RCS, in lieu of torque and engine gimballing. I don't use the LV-T30 (anymore), nor the Aerospike, nor the first radial decoupler (I use the one that is about 50kg lighter). I hardly use the 2m parts, or the seats (as you can't node mount them). Come to think of it, I hardly use any of the plane parts. Or the SAS.

You don't use RCS or reaction wheels (I doubt you turn off your SAS function)... how to you even... go around the space and stuff?

[Brofessional]

Probably this thing.

You don't use RCS or reaction wheels (I doubt you turn off your SAS function)... how to you even... go around the space and stuff?

I assume he isn't doing any docking. Other than that you don't need RCS, the capsules/probes all have their own reaction wheels.

Edited October 20, 2013 by Brofessional

[EvilotionCR2]

My least used parts are those two

- Engine Nacelle, because of its unwieldy shape not really fitting into any horizontal or vertical stack.

- Radial Engine Body, because it is both useless and ugly.

This. And also the micronode

[astropapi1]

Probably this thing.

I didn't even remember that thing existed. There's no real use for it.

[Kerbal01]

Any of the flat adapter parts.

[Valley]

I would have to say the Toroidal Aerospike Rocket. I assume if I liked making aircraft it would be useful. Maybe as I unlock more tech in career mode and try to explore more of the planet. But I don't even know how to fly aircraft with my keyboard so I can't see that happening anytime soon.

[Whackjob]

I didn't even remember that thing existed. There's no real use for it.

It's perfect for a tri-axial space station docking core.

[Galacticruler]

Seats.

No honestly, its rare that I use them.

And I never use the stock SRBs.

[andysim212]

my least used part is the 2 year old sandwich that jeb "forgot" and left in the 1 man capsule. Im sure some day someone will find it =)

[SkyRender]

This is my new favorite part. The amount of science it gets you is insane!

The data you get is insane, but the science you get isn't; it just scales the data up 10 times greater than any of the default science parts do. You're only getting 20 science from that 200 data at best, and 24 science from lots of repeat experiments (times whatever the body's science multiplier happens to be, of course).

[Giggleplex777]

I didn't even remember that thing existed. There's no real use for it.

I've used it several times to get a perfect inline connection when adding a part after a jet engine. I've also used it for the cargo section on my interplanetary ship:

Although I haven't used the Rockomax multi adapter for anything lately.

[Whackjob]

I've used it several times to get a perfect inline connection when adding a part after a jet engine. I've also used it for the cargo section on my interplanetary ship:

Now that's an interesting design. What benefits does it have, versus something that just hooks on in the back and pushes?

[MrPopcup]

The radial air engine,

NO USE AT ALL!

[DisarmingBaton5]

These three parts.

These parts as well

[lajoswinkler]

I see many people never use or even dislike micro-stuff. Engines, cores and tanks. They're extremely efficient for tiny probes. Minmus, Gilly, Bop and Pol can be explored for hours using such setups, and you need a lot less huge rocket to throw your probe all the way to your target.

[Andrew Hansen]

I see many people never use or even dislike micro-stuff. Engines, cores and tanks. They're extremely efficient for tiny probes. Minmus, Gilly, Bop and Pol can be explored for hours using such setups, and you need a lot less huge rocket to throw your probe all the way to your target.

Yeah, I agree. For a while I thought the inefficiency of the ant engines meant I should use the tiny Rockomax instead for its 350 vacuum Isp. However, using Engineer Redux, I found out it takes around 10 Oscar B fuel tanks before the greater efficiency of the Rockomax gives you more Delta V! The ant engine is so light that it makes up for it's inefficiency.

[Nicok]

All the 2.5m parts for me.

[astropapi1]

All the 2.5m parts for me.

How do you even...

[Whackjob]

I love absurd designs.

Even absurd tiny designs. I wish there were more smaller radii parts.

[maccollo]

The ant engine.... Why would I ever use that thing when we have this monster

That thing has more TWR than a mainsail.