I probably should have posted this here first but, risking a breach of forum etiquette, I'll re-post the thread here:
http://www.pprune.org/biz-jets-ag-fl...-more-huh.html
Summarizing the scenario: I have a Gulfstream III (G-1159A) at its MTOM of 69,700 lbs. (Please, no correction or discussion of weight in lbs. vs. mass in kg. needed
). It has been noise certificated as a Stage 2/Chapter2 airplane per this procedure from the AFM:
GIII Noise - Trolltune Corporation
164 KIAS (which = 164 KCAS/KEAS at sea level ISA) is V2+10 at MTOM.
Now, I decide to reduce MTOM to 61,500 lbs and climb at V2+20. Note that V2+10 at HW equals V2+20 at LW (164 KIAS), where LW = low weight, HW = high weight. What is the effect on climb? According to responses in the other biz-av thread, I can expect an increase in deck angle, climb angle, and climb rate. Although that sounds counter-intuitive, are we perhaps getting closer to (the airspeed we seldom discuss for such an airplane) Vy?
I have the G-III AFM but would like to quantify the changes after understanding the core answers to the question.
Your thoughts are appreciated.
Cheers,
Tom