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Old 07-25-2006 | 12:00 PM
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schokshi
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Default 2 stroke vs. 4 stroke engine size selection help !!
Hello,
I am about to complete H-9 P-51 ARF. Manual recommends, 2s .40-.46 & 4s .40-.82. Generally I've seen .52-.60 size 4 s recommended in place of .40 size 2S.

If I go by the HP, OS .46AX=1.6 hp
OS 70 4s = 1.1 HP
OS 91 4s = 1.6 HP

Does that mean to match power of .46 2s I need to put OS91?

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