Here’s one more data point for the Mach 2 kit, I’ve really enjoyed mine! After a H130W shakedown I flew mine on the AT 54/2560 K480W to 22,285' AGL (recorded by RRC3 baro altimeter and verified by GPS). Velocity data from the altimeter was not reliable, but the flight simmed at ~M1.8. This was tower launched with no rail buttons or lugs.
The K480W landed just under 1 mile from the pad. It outperformed my OpenRocket sim by 3,000' when set to "smooth paint" finish, so be advised if you are simming near the limits of your club’s waiver!
I used Hysol E-120HP for the fin roots (thanks for sharing this recommendation, CJ), and then pulled generous 1" diameter tool fillets over that after sanding again using the included Proline4500.
No tip-to-tip. I clear coated everything with SprayMax 2K clear (which is super nasty stuff but gives good results, wear a
real respirator). This was the second flight and the fins are rock solid. Only consequence of this fast flight was my vinyl flyer info sticker got melty.
I used ~12" and 42" ultralight spherachutes which gave me 80 and 26 fps descent rates. My dry weight was ~1305 grams.
Next flight will be the dual thrust K375NW, hopefully in early August.
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