5.5" Frenzy Massive - biggest motor?

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Yep. N2000 at Thunda down under to 18,000 ft. [video=youtube;wOnEYeIRxco]https://www.youtube.com/watch?v=wOnEYeIRxco&t=33s[/video]
Flies well at Mach 1.4. Rocksim said 14k. My only explanation for the extra 4k is that in the dual fin configuration if you have the fins perfectly aligned then the drag for the rear fins becomes insignificant. Rocksim simulated perfectly with this model below Mach. Keen to try an N1000 and an O in the future so there's a challenge for you. Regards Alex
 
Yep. N2000 at Thunda down under to 18,000 ft.
Flies well at Mach 1.4. Rocksim said 14k. My only explanation for the extra 4k is that in the dual fin configuration if you have the fins perfectly aligned then the drag for the rear fins becomes insignificant. Rocksim simulated perfectly with this model below Mach. Keen to try an N1000 and an O in the future so there's a challenge for you. Regards Alex

The explanation is that Rocksim's transonic and supersonic drag prediction is very poor (much too high). This results in predicted altitudes that are too low. There are a few threads on this in the forum.
 
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