Actual operation of the Merlin boost regulator

[41Sqn_Banks]

The Merlin XII used in the Spitfire II has higher engine limits because of certain changes (e.g. it uses a different coolant, 70/30% water/glycol instead of 100% glycol). For example climb boost is +9 instead of +6 1/4.

[Sutts]

Originally Posted by 41Sqn_Banks

The Merlin XII used in the Spitfire II has higher engine limits because of certain changes (e.g. it uses a different coolant, 70/30% water/glycol instead of 100% glycol). For example climb boost is +9 instead of +6 1/4.

Thanks 41Sqn_Banks, my understanding is that is only with 100 octane though - correct?