alfredbmor
Posts: 1133
Joined: 6/1/2005
From: El Paso,
TX, USA
Status: offline
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quote:
ORIGINAL: Harry Lagman
Alfred, you are going to get lots of recommendations for engines you aren't interested in when you start threads like this. The Saito club will chip in with their recommendations, the Nordic division of the Cheap and Cheerful Model Engines Enthusiasts Club will recommend the latest delights from mainland China and you might even get Motorman come in with a blanket recommendation to go with a YS 1.10 or 1.40.
So, to focus somewhat on the two engines you mention, this is what I know...
The OS AX 1.20 is a strong engine that is easy on fuel. Check out the pattern forum - a lot of guys there use the AX 1.20 in airframes like the Venus II and Excelleron as practice ships. They are very good engines. They are stronger than a YS 1.10, which is in turn stronger than an OS 1.20 Surpass, which is in turn stronger than your Magnum 1.20 FS. The AX would be a good choice for your expoits. It should pull that MA K series prop that your current engine does 8900 rpm with (I'm guessing it's a 15 x 8 or a 16 x 6) at something approaching mid to high nines - that's a big difference.
Good luck and let us know what you decide.
Edit: Prop size
I appreciate the help of you all.
I quoted the Harry Lagman post because it clarifies my original post.
But all other posts are creative and interesting as well so I thank you all.
I really do not want to spend a bunch of money trying engines that easily could fly my CG Ultimate.
It fly just ok with my XL 4 stroke Magnum that can swing a 16 x 6 Master airscrew K series at almost 9,000 but if a try a wooden prop I have to use a 15 x 6 because the lack of punch of this engine.
When I say that it fly just ok I mean that it go up and down with enough power but it needs more power to do some acrobatic routines and vertical is very poor.
A friend of mine use to have the same airframe in the ARF version which was overpowered with a YS 140 but it was also a very heavy combo and when he had the first death stick it was also the end of his biplane, I just remember that it feel from about 200 ft like a brick.
I just thought that I could go with an alternative kind of cheap and lighter engine, that is why I thought about the OS AX 1.20 and I wish to know the tach readings and behavior of this particular engine.
Thanks again for your help.
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Saito Club Member
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