Roger Moore
Active Member
For those of you currently flying the RV4 please check your aft gusett/weldments on upper engine mounts. In my annual airworthyness inspection I found both left and right cracked. I have a new xp360 on the aircraft with 105 hours on it and had approx 400 hours on an 0-320 prior to that for a total of 500 hour on the aircraft. Vans says they have never had this problem with the upper mounts onlu on the lower of early aircraft. I do aerobatics regularly but generally pull 3 g's or less in all manuvers. The most I have ever pulled is 5 g's on one ocassion. My flying backround is 26000 hours total with 500 in RV4's and 2000 tailwheel so I do not fatigue is pilot induced. Vans Aircraft is very intrested in this and I will follow up. Roger Moore