biplane& Gysbreght
VMCG is uses only one flight control i.e. rudder
1. V1 is connected to factors affecting acceleration and control on ground, like VMCG, VMBE.
2. Vr the transition from ground to air starts at Vr so it connected to factors that affect control on ground like V1, transition to air like VMU or V lift off and in air like VMCA.
3.V2 is limited by Vs1g and VMCA. It is V2>1.13 VS1g(JAR FBW) and >1.10 VMCA
Regulation states VR may not be less than V1 and 1.05 VMCA.
So VR has to be higher than both VMCA and V1, which has to be higher or equal to VMCG. Now your question could VMCA be less than VMCG? No direct relationship but it can't be. Your other question difference between VMCA and V2.
VMCA is a demonstrated minimum speed. V2 is minimum climb speed that must be reached by 35 feet. Flying below V2 in case of engine failure is likely to lead flight below VMCA, loss of directional control if speed is further reduced. Flying above V2 in case of engine failure likely to lead to not respecting obstacle clearance.
Last edited by vilas; 17th May 2014 at 11:19.