Dom.....I was not questioning the recommendation by Krick ..vis ...steam or electric, and the option for alternate propellers.......however if the steam powered prototypical has large 4 blade propellers, then an electric powered model could also remain as prototypical with large 4 bladed propellers and use a speed controller to achieve suitable shaft speeds
It is acknowledged that when the model Imara was first produced, larger current capacity electric speed controllers would have been limited to the likes of
Bobs Boards so this may have influenced the Krick recommendations?......any thoughts?
So we see that the Marie Felling appears to have used the same Builders
hull design & build, however her steam machinery may have been different?
The other possibility is her intended location just below the equator & higher temperatures may have dictated the steam plant require more air and hence the extra pair of
very large air intake ventilators just behind the bridge....being over & above those fitted to the Imara etc
Derek