Procedural Soviet R-7 style boosters ?

[baldamundo]

Are there any mods which add these? I've been experimenting with using regular procedural fuel tanks in cone shapes which work okay, but it's tricky getting them to fit exactly and they never look quite right (I presume because the R7 boosters weren't just regular cones?). I realise there's plenty of mods that add R-7 style boosters, but I'm very careful about part-bloat and much prefer more versatile and especially procedural parts where available. Does anything like this exist?

[Guest]

This is mine, built with procedural tanks and parts, plus a bit of rotational twittering on the engines.

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I built it from this image, which gives the dimensions in millimeters. There are technically three cones on the tank. Whack a girder on the side of your rocket and then attach a ptank to it. Build the large central cone from that (11.165m long, 1.35m top diameter, 2.68m bottom diameter) and then build the top cone and bottom engine support. Pick it up via the central tank and attach it to a decoupler. BAM!

These values are easily scaled to other sizes, although the R-7's "natural" 2.68m diameter is pretty close to stock's 2.5m. Your fairings should fit a 2.5m payload pretty snugly if you're playing stock.

[baldamundo]

Aha! This is exactly what I needed! Thanks for the tips!

Am I reading it right that the ratio of the heights is approx 4:11:4? And the bottom part is just a straight cylinder. And the ratio of base diameters is something like 2.7:2.7:1.4?

And by 'rotational twittering', do you mean just in order to get the engines vertical?

[Guest]

Am I reading it right that the ratio of the heights is approx 4:11:4? And the bottom part is just a straight cylinder. And the ratio of base diameters is something like 2.7:2.7:1.4?

vOv, haven't done the math. But the measurements are all there for you.

And by 'rotational twittering', do you mean just in order to get the engines vertical?

Yes.

[baldamundo]

I've not done any real maths - just divided the numbers by a thousand and rounded them up - just trying to check I'm not being dumb and am actually reading the charts correctly

[baldamundo]

Okay, if anybody cares I've crunched some numbers:

Converting it to standard KSP 1.25m scale, you get a ratio of 1.25:1.25:0.63 for the bases and 1.8:5.2:1.87 for the heights.

[Sampa]

Okay, if anybody cares I've crunched some numbers:

Converting it to standard KSP 1.25m scale, you get a ratio of 1.25:1.25:0.63 for the bases and 1.8:5.2:1.87 for the heights.

In english?

[NathanKell]

In english?

Okay, if anybody cares I've crunched some numbers:

Converting it to standard KSP 1.25m scale, you get a ratio of 1.25:1.25:0.63 for the bases and 1.8:5.2:1.87 for the heights.

There you go.

[baldamundo]

In english?

So each booster cosists of a cylinder at the bottom with a diameter of 1.25m and a height of 1.8m, then a conical middle segment with a diameter at the bottom of 1.25m and at the top of 0.63m and a height of 5.2m, and then topped off with a 0.63m base diameter cone with a height of 1.87m which ends at a point.

And if you want a different size, but the same proportions, just multiply all those numbers by a constant number - e.g. if you want 2.5m scale boosters, just multiply all of the above by 2.

Edited October 20, 2015 by baldamundo