MaxiProp order form question

Roger Banks <roger.banks@...>

I'm wondering if anyone can help me with a factoid please, having
tried Olivier without response unfortunately. I own Mango 28, built
in 1982. It has the Perkins 4.236 motor with Hurth HBW400-2R gearbox.
For the purpose of ordering a MaxiProp, can you please let me know
what would be the reduction at the propellor?

Regards, Roger, Mango 28, Zorba

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