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#41
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I'm going to chance an altimeter in my next 1340 flight, an inexpensive unit or my Pnut to get data. On long burn Ellis G35-10 the 1340 and 1340/20 [I still have a couple left] because the motors are low smoke you can hear the model still under thrust but lose site of it after a couple of seconds into the burn. These are very high altitude models I really need to capture some data. Any other suggestions for an inexpensive recording altimeter choice other than the Pnut since you have personally tested most altimeter models in flight? I have a couple of Stratologger [not the CF] and Pnuts in the range box. What is the least expensive altitude only if i don't want to risk my PerfectFlites? .
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#42
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If you want recording, the only less expensive option really is the Altus Metrum MicroPeak. But after you buy the interface to get the data out you're well past the price of getting another Pnut ($58.46 plus shipping at perfectflitedirect.com). I presume you have the PerfectFlite interface device already. For altitude only the new FireFly from PerfectFlite (at least once they come back in stock) is the best bang for the buck right now, in my opinion. The MicroPeak is half the size and mass of the FireFly so your 1340 would never know it's there....but a Pnut isn't all that massive.
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Bernard Cawley NAR 89040 L1 - Life Member SAM 0061 AMA 42160 KG7AIE |
#43
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As a possible alternative (or as a back-up/comparison) to an onboard altimeter, what about flying a 1340 at night, with a strobe light mounted inside an un-painted nose cone? With two azimuth-elevation trackers (or three elevation-only trackers, as per the method covered in G. Harry Stine's "Handbook of Model Rocketry"), the altitude could be determined trigonometrically. Also:
The rocket's position could also be compared against the (angular) altitudes of selected stars (whose altitudes could also be measured using the trackers, as well as being checked with an ephemeris or a planetarium computer program). This could be done at leisure by photographing the rocket and the selected stars. Recording the rocket's exhaust- and strobe-illuminated path on time-indexed video would also provide another way to determine its velocity ("mach-buster" model rocket experimenters often use this method). In addition: Recovering the rocket could be facilitated by using one or more aluminized mylar parachutes, into which bright LED lights (tied to the shroud lines' converging point at the "load" end of each 'chute) would shine upward, using the parachute canopy as an analog of a car headlight's parabolic reflector.
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