OS 91 VR-DF square and roud head difference
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OS 91 VR-DF square and roud head difference
Hey Bax...
I got a gift from a friend a new old stock OS 91 VR-DF (square head) complete with tuned pipe with a round head parts.
I would like to ask what is the difference and the utility of the two types of head. as I read the manual is not explained in detail usability.
According to OS manufacturing timeline by two types of head is made in different years about 15 years.
I had a break-in and flew with very satisfactory results, good idle, good transition and good top rpm ( is more than enough for my plane.)
I was flying conditions
Fuel oil 22% and 0% nitromethane
Glow plug OS 8
Propeller 11 x 11 groupner (13400 rpm max)
MACS tuned pipe
Temperature when maximum rpm on the ground 83 deg Celsius
Best regards,
Kartika
I got a gift from a friend a new old stock OS 91 VR-DF (square head) complete with tuned pipe with a round head parts.
I would like to ask what is the difference and the utility of the two types of head. as I read the manual is not explained in detail usability.
According to OS manufacturing timeline by two types of head is made in different years about 15 years.
I had a break-in and flew with very satisfactory results, good idle, good transition and good top rpm ( is more than enough for my plane.)
I was flying conditions
Fuel oil 22% and 0% nitromethane
Glow plug OS 8
Propeller 11 x 11 groupner (13400 rpm max)
MACS tuned pipe
Temperature when maximum rpm on the ground 83 deg Celsius
Best regards,
Kartika