Thank you all for your responses.
I noticed that there are various prop sizes that I can try on my LA46.
However, the question is, how do I know if I need to try some new prop sizes?
How can you tell if it’s the ‘wrong’ prop size instead of ‘wrong/not optimum’ engine setup (for example: RPM not high enough, too much nitro/too low nitro, etc.)?
That's very difficult and takes a lot of knowledge and experience. This is where having someone with experience can greatly speed up the process. That is also why you see me and others give people give these extraordinarily detailed setup instructions - it's trying to remove the need to evaluate and diagnose problems to the extent possible.
Unfortunately, there are also plenty of people who - with no malice and with the best of intentions - will give you such wildly variable advice. People have been flying stunt in more-or-less the modern form for around *75 years*, over that time, many ideas have come and gone, most of them were not right in the first place. So you might hear any of those, parts of one idea and parts of another, or almost anything. For most of the 75 years, it was utterly impossible to come up with system that would work for everyone - because the engines were so poor and so variable from day to day or individual engine to individual engine that what worked on one of them may not work for any other.
More modern engines are far more repeatable, for the most part, which is why almost everyone recommends OS LA series - they are *dead nuts* repeatable, so you really can come up with a "working" system and have some chance that it will work for someone else, too. Semi-custom engines like those used in competition (Jett 61, PA series, etc) are even more like that, if you have the same engine configuration, *they will run the same way*.
I don't have a set up for an 46LA, lots of other people do and there is a pinned post about it. Avoid any advice that talks about running more than about 5" of pitch and for sure any advice that tells you to open up the engine and grind/drill/file on it, because that is patently not necessary. Also avoid anyone who wants to grind/drill/file it for you, they are wrong and do not know what they are doing.
Obviously a big airplane requires more performance from the engine than a little one. But how you harness it with something like a 46LA is generally nothing like it was for most of the history of stunt - you can run more diameter, less pitch (and whatever reduced diameter is required to get the necessary RPM in a favorable setting). etc. The most dominant engine/prop system we have ever had used a tiny prop on a huge airplane (40VF with a little Bolly 11.3-4.25 two-blade). I have someone in mind to give you a setup for a conventional-sized airplane but I want to ask him first before putting him into the firing line.
Brett
Topic: Is Thunder Tiger 11x4.5 a '4-2 kinda' prop? (Read 3190 times)