stunthanger.com
Electric Stunt => Gettin all AMP'ed up! => Topic started by: aba183210 on January 12, 2016, 10:58:26 AM
-
Good morning.
I recently bought an ARF RSM Ringmaster take apart. The power system supplied with the plane is the RSM .25 equivalent package.
The plane's RTF weight with the battery is 38 ounces. Using the included setup, I had to increase the RPM to almost 11800 in order for the plane to perform wingovers without losing line tension. As a result of the RPM increase, the battery run is about 4 minutes instead of 5 1/2.
I am using a 10 x 5 EP propeller, a 3300 mah 3s battery, a 45A governed ESC, and a Black Tiger motor that has a peak of 450 watts and a KV of 1400. Lap times are 4.9 seconds and on 60 foot .015 lines.
As for that Magician, it met its untimely death because, when I was flying it, the entire battery box with the battery fell off. The plane was in such an attitude that it could not recover and crashed hard.
Postmortem examination revealed that the battery box was glued to the paint of the fuselage, not to the wood itself. The box fell cleanly-it did not take any fuselage or battery wood because it was glued to the paint. I bought that plane ready to fly.
As a result of this, when I got this Ringmaster, I stripped the paint from both the fuse area and battery box area where epoxy would be applied. I used 30 minute epoxy and the box seems solidly glued this time.
Should I use a larger motor or change other parameters? This setup worked wonders in the Magician I used to have (48 in wingspan and 488 sq. in wing area and 40 ounces RTF with battery).
-
That sounds too heavy -- my Ringmaster with a 25LA is porky at 32 ounces.
What's the bare airframe weight?
-
Yep, that's way overweight for a S-1Ringmaster! The S-1 airfoil is inefficient but can be compensated for by light weight. 25 oz is a good RTF weight (my lightest S-1 electric is 28) so you need to shed about 10 oz.
-
That sounds too heavy -- my Ringmaster with a 25LA is porky at 32 ounces.
What's the bare airframe weight?
26 ounces
-
Try a 9-6 and lower rpm. Do you have too much rudder and line rake killing your speed. You could also shorten the lines 2 feet to use less battery.
MM
-
Thanks for your replies.
I ended up selling the plane to a guy who will convert it to glow. I simply got tired of thinkering with it to make it fly decently with all that weight.