twospruces wrote:Howard, do you think that a 7 inch peck could be a good substitute for the 7 inch guillow (question mark)
sorry, my keyboard is a mess for some reason and some punctuation marks are currently not available to me....above is a question (exclamation mark)
That is an interesting question and I just happen to have some experience with this. I flew the prototype Porter, which was about ten grams heavier than a production kit, with both the 7 inch, Guillow, black prop and a 7 inch Peck prop. The model flew best on a loop of 1/8" rubber along with a loop of 3/16" rubber. The performance with either prop was essentially the same. I would suspect, that a production weight kit (45 grams, or so) might fly better with the Peck prop on two loops of 1/8" rubber, but I haven't tried it.
The Beaver prototypes would actually fly with the 5" red prop, but fly much better with a 7" black prop or a 7" Peck prop. The Beaver will also fly, with the floats using the aggressively pitched Ikara 6" prop on a loop of 1/8" along with a loop of 3/16". ( This is hand launched. It would have to be lightened considerably to even think about R.O.W takeoffs under rubber power, although I have seen video of one flying indoors, on floats, off a gym floor). The float struts would have to be extended to get clearance for the 7" propellers.
I use the Peck 5" prop on single motor No-Cals with 1/16" rubber indoors and 3/32" rubber outdoors. I use the 4" Guillow black prop on multi-motor No-Cals with 1/16" rubber indoors and out.
Hope this helps.