APC SF - quite efficient but safe only at lower rpm (65000/prop diam max. = 6500rpm for a 10" prop.
APC E - less efficient at low rpm than the SF, but able to withstand far higher rpms (190,000/prop diam. = 19,000rpm for a 10" prop).
Master Airscrew - standard series are not very efficient - sorry, I have no experience with the new "electric only" MA props.
In my experience, for parkflyers, the GWS HD are tough and the most efficient of the lot.
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