About

Gender

Male


About Me:

Aerospace education officer, Civil Air Patrol.


Please tell us a bit about your UAV interest

Working on lifting RC glider to 90k ft on weather balloon; then releasing and having it return.


Activity Feed

Prahas David Nafissian replied to Andrew Tridgell's discussion ArduPlane 2.68 released
"Hi Guys,

In this version as in previous, Condition_Change_Alt not working.  I make param 1 15 cm/sec,
and param 2 an altitude (say 600 ft) which is supposed to be the end condition.  I write the WPs.
When I read the WPs back, it keeps the 15 but…"
Dec 21, 2012
Prahas David Nafissian posted a discussion
Hi,I put "do_jump" into my command list.Has no effect.  Thoughts?Condition_change_alt and condition_delay alsodo not work.v. 1.2.20.Also, since I used the Loiter command once,every time I fly a new mission (even without loiter commands),when the…
Dec 4, 2012
Prahas David Nafissian replied to Peter Cathcart's discussion Can't seem to allow "Swooping" or steep descents
"Set Alt_Ctrl_Alg to 1, and Lim_Pitch_Min to -55.  The first tells Ardu to 
make hitting altitude the first flight priority."
Dec 4, 2012
Prahas David Nafissian replied to Mike's discussion Hard vs. soft waypoint altitudes?
"In the advanced parameter list, change Alt_Ctrl_Alg to 1.  This tells Ardu to make reaching altitude
the top priority. (Don't forget to write the new param list).  

Also, make Lim_Pitch_Max = 90.  This will allow a steep climb.

Good luck!"
Dec 4, 2012
Prahas David Nafissian posted a discussion in Project B.L.U.A.S. - Balloon Launched Unmanned Aircraft System
Hi,So happy to find you folks!  I've been working on thisproject for 6 months, after a successful "regular" balloon launch.Any comments much appreciated...My half-ideas are as follows:In the parameter file, set "Throt_Max" to 0.  The RC hasto glide…
Nov 29, 2012
Prahas David Nafissian replied to Tristram Cheer's discussion Silly Question: X-Plane 10 PT-60 Pulling to the left
"Hi -- try one of the param file I have attached.

Take off in manual -- get it level.  Then switch to stabilize, and see how it works.

If good, put the airplane back on the ground, set a few simple waypoints in the
flight planner, take off in…"
Nov 29, 2012
Prahas David Nafissian posted a discussion
Hi,My half-ideas are as follows:In the parameter file, set "Throt_Max" to 0.  The RC hasto glide home due to power constraints, until it is visibleto the pilot, who will then switch it to manual and land it.I don't know how the condition commands…
Nov 29, 2012
Prahas David Nafissian posted a discussion
Hi,Any idea when the Do_Set_Parameter commandis due to be implemented?Thanks!--David
Nov 27, 2012
Prahas David Nafissian replied to Prahas David Nafissian's discussion Do_Change_Speed bugs?
"More -- when i set do_control_speed to 0,1,1 (airspeed, 1 m/s, 1% throt), and had it fly
to a waypoint at the same altitude it started at, it did fine until it started to stall
(ie, it glided with no throt).  Then it went nuts trying to right…"
Nov 25, 2012
Prahas David Nafissian posted a discussion
Hi,Anyone know the current statusof this command?  I noticed inthe past there were a few bugs.When I try using in the sim,it seems to have no effect at all,or (once) it had an erratic effect...Thanks!--David
Nov 25, 2012
Prahas David Nafissian replied to Prahas David Nafissian's discussion Lost Gyro Calibration / Radio Calibration in Sim Mode
"Tried deleting install, and reinstalling.  Got v 1.2.19.  Same errors.  Now trying to re-update to 1.2.20."
Nov 23, 2012
Prahas David Nafissian posted discussions
Nov 23, 2012
Prahas David Nafissian commented on Earl's blog post 8-3-12 Balloon/Glider Flight
"Hi Earl and Company!

A few questions about your Ardu / balloon
mission, as I plan ours.

How are you planning to activate the Ardu.  In my
vision, as the balloon carries it up, it is inactive.  Upon
release from balloon, Ardu should activate and…"
Aug 11, 2012
Prahas David Nafissian commented on Earl's blog post 8-3-12 Balloon/Glider Flight
"Hi Earl -- please see my Qs on the "Another 97,000 ft ..." blog post from a month or so back.  Thanks and great work!!!!  --Lt Nafissian"
Aug 7, 2012
Prahas David Nafissian commented on Earl's blog post Another 97,000 + ft Balloon with APM2 and 3Dradios
"Hi Earl and Company!

A few questions about your Ardu / balloon
mission, as I plan ours.

How are you going to program Ardu to get home 
after you release it from your balloon?  Are you 
using way points?  Or is "rtl" enough?

Can you set the "home"…"
Aug 3, 2012
Prahas David Nafissian commented on Earl's blog post Another 97,000 + ft Balloon with APM2 and 3Dradios
"Hi Earl -- Is this the X8?  (Your version minus motor):  https://www.youtube.com/watch?v=QIg6u6zgcNc&list=PL036E49765D41E...  

I too was thinking a fixed wing glider was the best design for
high altitude...

--Prahas"
Jun 20, 2012
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