As an aside, max-q is the worst case loading on a *normally* operating rocket and the worst case escape scenario should not be the same, since we assume the rocket stopped accelerating.
Yes, the aerodynamic load peaks as a function of speed and air density. The rocket structure also experiences an acceleration load, but if the engines throttle to keep it constant, than the peak of aerodynamic load is also the peak of total load, and we're all in agreement.
and so easier for the tanks to handle.
Heh. No Internet fighting!
Quote from: meekGee on 11/01/2012 01:37 pm and so easier for the tanks to handle.Can't say that either. It is a function of pressure, acceleration and propellant remaining, and therefore peak structural loading of the tanks may occur before peak acceleration, whereas for non tank structures, it is a peak acceleration.
Quote from: Chris Bergin on 10/29/2012 08:58 pmHeh. No Internet fighting! Obligitory. http://xkcd.com/386
Quote from: simonbp on 11/01/2012 03:50 pmQuote from: Chris Bergin on 10/29/2012 08:58 pmHeh. No Internet fighting! Obligitory. http://xkcd.com/386Ironic, when there was only one word! http://www.merriam-webster.com/dictionary/obligatoryHad to point it out in the circumstances! And it's not even bedtime, yet.cheers, Martin
Details? From today's Royal Aeronautical Society lecture:"Duncan Law-Green @Rocketeer_UKSuperDracos 6-8gs, will boost through sound barrier in 4s"
Quote from: corrodedNut on 11/16/2012 09:57 pmDetails? From today's Royal Aeronautical Society lecture:"Duncan Law-Green @Rocketeer_UKSuperDracos 6-8gs, will boost through sound barrier in 4s" What do the Tower LAS do in comparison to that?
Quote from: AndyX on 07/15/2013 01:40 amQuote from: corrodedNut on 11/16/2012 09:57 pmDetails? From today's Royal Aeronautical Society lecture:"Duncan Law-Green @Rocketeer_UKSuperDracos 6-8gs, will boost through sound barrier in 4s" What do the Tower LAS do in comparison to that?What tower LAS do you mean? It all depends on how fast it needs to be able to get away from the LV. F9 should have a relatively benign worst case scenario compared to something sitting on top of solid(s). One could make a tower LAS with SD thrusters if one wanted.
Ok more specifically, does anyone know what g forces is the MPCV tower LAS expected to pull and is it more or less that the SDs? I'm assuming it would be greater as solids can't be turned off and so the capsule has to escape an accelerating lv. Yes? No? Anyone?
Quote from: corrodedNut on 11/16/2012 09:57 pmDetails? From today's Royal Aeronautical Society lecture:"Duncan Law-Green @Rocketeer_UKSuperDracos 6-8gs, will boost through sound barrier in 4s" Whooah....and I thought 0-100 in 5-6 seconds was a rush :-p
Quote from: docmordrid on 11/16/2012 11:11 pmQuote from: corrodedNut on 11/16/2012 09:57 pmDetails? From today's Royal Aeronautical Society lecture:"Duncan Law-Green @Rocketeer_UKSuperDracos 6-8gs, will boost through sound barrier in 4s" Whooah....and I thought 0-100 in 5-6 seconds was a rush :-pAmazing acceleration, but for exact times to the sound barrier, here's what I work out:avg acceleration time to sound barrier4g8.7 s5g6.9 s6g5.8 s7g5.0 s8g4.3 s8.7g4.0 s9g3.9 sAssumptions: - sound barrier is 340 m/s (i.e. sea level sound barrier) - 1g = 9.8 m/s2 - initial velocity is zero