Stinger 64 HAB Early Integration Pictures with APM2

I've just finished the build and will begin early full up integration testing in the next day or so on NTNS-2.  This is a highly modified Stinger 64 with APM2.  There are really 2 airframes.  One is for flight testing, gain tuning, learning a little about APM2.  I have to admit that there have been several issues.  The two that i know that I have are the flash card slot being a bit less than tight, perhaps some formatting issues -and- the stock GPS lock issue.  For my installation this doesn't seem to bother time to 1st fix, but I am loosing lock in flight, dropping satellites.  I am NOT using a downlink, have the jumper removed, and power is being applied to the input and output sides with a Castle BEC Pro set at 5.05V.  SW version is 2.40.  Of course no red wire from the ESC.  The GPS is somewhat masked by some wires and the EDF mtr wires run just behind APM down to the fan.  It's not ideal for EMI.

Not to worry since this isn't the objective configuration and I just "score" APM when it has lock and the altitude is reasonable.  My 100 mph Stinger flight test bird:


Here's a picture from the Stinger HAB build.  It's pretty tight inside the bay:

Some of the BOM:

2-Castle BEC Pros (5.3 and 12V)

3-Omega Kapton heaters

1-external relay + helpful external LED

3-Airtronics 94761 servos for flight control

1-analog servo for the sailplane towhook release


Venus GPS/regulator/logic level converter

SparkFun datalogger

ReplayHD 1080p (heated) and externally powered

4s 5000 mAh battery

airspeed probe and pressure sensor

voltage and current sensor

Airtronics 10ch rcvr, Airtronics SD-10g TX

Very much modified Stinger 64 airframe (the only inexpensive component)


I'm about 1/2 # lighter than NTNS-1; 1200g Kaymont

Total weight is 3# 2oz vs. the flight test bird at 2# (identical XCG and flight control setups)

Ballast is 2.3oz in the forward bay.

The result:

Testing, SW version catch up/merges, HIL testing with FlightGear/X-Planes, Temperature testing with APM1, duration testing, log testing.... to follow.


Views: 1944

Comment by Gary Mortimer on July 17, 2012 at 11:00pm

That pitot probably won't last long ;-) Lovely looking AF though.

Comment by Rick Stewart on July 18, 2012 at 7:13pm

What is with the use of heaters on this craft?


Comment by David on July 19, 2012 at 3:58pm

Fantastic to see the plans taking shape- keep up the good work!

Comment by Larry Grater on July 20, 2012 at 11:17am
The pitot could have been placed anywhere with undisturbed flow. This placement worked well on the flight test bird since the pressue sensor can be in the fwd bay. I don't like the long tube lengths for the HAB airfame. The sensor is in the main bay. This was just easy and is proven to 120 mph at SL.
Comment by Larry Grater on July 20, 2012 at 11:20am
The heaters and relay are to keep exposed electronics within working temperature specs. Heat above 20k ft.
Comment by Larry Grater on August 17, 2012 at 7:21am

The launch time for North Texas Near Space (NTNS-2) is scheduled for 1200Z 8/18/12.  The flight may be visible on, but due to the remoteness of the area I'm not expecting great repeater coverage.  We are using local tracking as primary.  The plan is to launch and land at the same site since trajectory predications only show 17-20 miles to the 100k ft mark.  The Call Sign is KA5HND-1.

We plan to chase the payload 1/2 way to the release point to stay in proximity in case there is an off nominal.  If all goes well the plane should beat me back to the landing site and loiter for a fairly long time. 

Comment by Larry Grater on August 18, 2012 at 1:54pm

Quick Look: NTNS-2 successfully launched and ascended as expected. Peak altitude was ~88k ft. The payload appeared ballistic and impacted fairly close to my ranch, but has not yet been found.  I'll post more when the payload is found and the data has been examined. Peak velocities were very high and I belive the chute was not attached at impact. i.e. the balloon burst and the free fall logic worked, or some other combination of anomoly.  APRS tracking was nominal and last (direct) measurement was ~1500 ft AGL.  LG


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