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This bird was found last month in just about the exact location I thought it should be, which I had scoured in June. Amazing how easy it is to find a lost rocket when the grass has dried up and been grazed by cattle.
And yes, most of it was lost due to the impact. I did verify altitude at 19999 feet. The flight computer (Marsa 54) was able to be read, but is too damaged to use on another flight.
Alas …
Are you using shear pins? What is your expected maximum altitude with this bird? Supersonic flight? Any other significant mass objects in the nose?
I've not often vented payload bays, as I do use shear pins more often that not. I have started to reconsider this a bit lately with bigger, higher flying birds that cost more. This is due to the several failures I have had with shear pins that don't, despite testing.
For example, do you vent your nose cone assembly (this is where I place trackers for example)? If not, does the swelling caused by the pressure differential bind the nose cone to the upper airframe? Perhaps not an issue in dual deployment, but an example of how designing pressure neutral airframes can be taken to extreme (?).
While vent holes in avy bays are a bit more critical in sizing (to avoid pressure fluctuations at transsonic speeds), IMO vent sizing in payload bays is much less critical. If you have concerns, an extra hole is not going to defeat your ejection charges or increase drag appreciably 🙂
How big a chute are you using? Your comment about it fitting tightly in a 2.75' long bay has me wondering …
FWIW … Bob
Very nice Doug. Thank you for all the photos!
I recently was introduced to a ~$100 camera that looks like a periscope. It’s small, high video rate, remotely managed via cell phone, and looks like it will mount into a ~1″ hole in an airframe. Not as aerodynamic as your shroud, but low profile, round and smooth. I’ll post photos / links shortly
The video is nice. The link to the image you note in your first response is bustified. Would you please re-post?
Are you mounting the cowl to a GoPro camera body, or to a housing (to avail yourself of various mounting options? Which GoPro are you using? I have an earlier HD Hero.
I do see by the way (from a post on a GoPro forum), that for Hero 3 / 3+ generation cameras, Snake River Prototyping offers an attachment that allows use of screw in 55mm filters. I note also that there are some “spy lenses” that come in 55mm filter format …
I note also that with some newer GoPro cameras, one can configure field of view from ultra-wide to not-so-much. Yet to play with this …
Thx!
