Haywood,

I think you are confusing the 1/5th scale (77" span) with the 1/4 scale (96" span)

I contacted Ray at Kangke about my intentions of putting a Saito 90 radial in my 1/5 scale version and he thinks it will fly just fine.

A friend at our field has a Saito 91 in his and it flies very scale like. The 91 2 stroke should have plenty of power.

Bob