what is your favorite size parts to work with?

[Luna-Industries]

I love a̶b̶u̶s̶i̶n̶g̶ using 0.625 m parts to create efficient, compact lander craft. In Round8 I trust.

[cantab]

I don't think I have a favourite size, I mix and match a lot. In particular for my orbiters I'll often push 2.5m fuel tanks with a 909; I want shorter fatter tanks for a stable craft but the Poodle is just massive overkill for the masses involved. Likewise for smaller craft I'll push a 1.25m tank with a Spark or an Ant. No doubt when I build bigger rockets I'll find myself pairing Mainsails and maybe Skippers with Kerbodyne tanks.

[jackboy900]

I love the rockomax parts or SpaceY heavy parts.I chose 2.5 M because that is my most common size

[moogoob]

Most of my launchers either are or contain Size 2 (2.5m) parts. That Skipper is so useful for upper stagers!

[UniQueKakarot]

I'm Mostly hanging around with the 2.5m parts since the habitation module and stuff like that is nice to bring along for interstellar missions. And I find the poodle to be the engine I tend to use the most for pretty much everything I do in space

-UniQ

[Teilnehmer]

1.25 m is my favorite size.

[Columbia]

Mk3 only exists to look like the shuttle, doesn't it? If it didn't exist, there'd be no need to invent it.

Where'd you get this assumption? Sure, it may look like the shuttle, but it's not just used for that in itself. It has cargo bays that fit 2.5m parts and such. People use it all the time.

On topic: Because I overengineer everything, I always use 3.75m parts for 2.5m payloads.

[Norcalplanner]

I'll gladly use parts of any diameter, depending on the situation. However, my heart belongs to the 5m parts in SpaceY, which allowed me to build a wonderful Saturn V replica using the stock 3-Kerbal capsule. The center engine in the first and second stages even cuts off near the end of each stage's burn. I love that!

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[Dafni]

On topic: Because I overengineer everything, I always use 3.75m parts for 2.5m payloads.

Same here. All the lifters I have in rotation are 3.75m. I use them even for small LKO probes, which is definitely overkill. But I play science mode so I don't care about funds and stuff.

I just find the 3.75m lifters to be more stable and easier to fly. The payload stuff is usually 2.5m, as I believe is most common anyway.