Originally posted by Mike Bogh
I'd try a APC 13X4 W Jd, that will let the engine spool up quicker, and MDS's like to run on the upper RPM's.
You'll like that prop I think...just be sure to ask for the "W", it stands for wide....
OK, agreed, many engines do well on a 14X5 Zinger. It's allot cheaper of a prop, too.
The APC 13X4 W is a $7-8.00 prop. The same APC prop in a 14X4 W costs double that, about $14.00 or so.
I have had many, many
MDS engines and
typically they like the smaller diam. props, model for model. I have no experience with GMS, so I won't comment on them.
I
do know that MDS engines have carb issues that tend to sag at the midrange transition, this is why I recommend the APC 13X4
W.
The MDS will clearly have the needed HP to hover the Razzle, that is not in question, to me.
The question is how to
best run the 78 on
your plane and I stand firm on the 13X4 W.
If it doesn't work well I'll buy it back from you.
The Zinger is a wood prop, and therefore lighter than APC inch for inch. This will help the MDS spool up quicker, too.
The main thing about the APC is the prop is designed for "fun fly" type planes by having a much wider blade than the Zinger, there by getting more "bite" .
Nice thing is the Zinger is affordable, so you might as well have one or two anyway since they are wood and are prone to cracking easily.
Good luck and please keep us informed on your progress.