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<t>I have just assembled a model MM-5 engine, coffee cup type, and I <br/> want to know what some of the prop speeds other people have obtained <br/> with the same or similar S. engines. In it's intial run, it seemed <br/> the prop speed was abt 400 rpms, but two subsequent runs (all with <br/> boil...

<t>I have just assembled a model MM-5 engine, coffee cup type, and I <br/> want to know what some of the prop speeds other people have obtained <br/> with the same or similar S. engines. In it's intial run, it seemed <br/> the prop speed was abt 400 rpms, but two subsequent runs (all with <br/> boil...