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Old Jul 30, 2012, 12:58 AM
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Daemon's Avatar
Lakewood, Colorado
Joined Aug 2002
27,684 Posts
Quote:
Originally Posted by rcmonster99 View Post
I probably would have dived the same way if I know there was a strong wind against me. It was a close have though!
It's still better to resist that urge, *especially* with a headwind.
Just this evening, I flew my X8 out 6.5 miles (new PB), and turned toward home
with 3400ft of altitude and only 1200mAh remaining in the pack. Normally
that'd be plenty as the X8 has a great glide ratio (even if only 10:1,
that's 6.4 miles on glide alone, and I know it's better than that).
That's when I discovered I had at least a 10mph headwind (was dead
calm at launch, and air I was flying in was glass smooth). That cut
my ground speed to less than 20mph effectively adding at least 7.5
minutes to my flight time, increasing total distance through the air
to over 10 miles. Was all I could do to keep from putting the nose down
a lot when I'd see the ground speed drop below 15mph. A tiny bit of nose
down, as little motor as possible and simply wait it out, and I made it all but
the last 175 yards (landed at the end of the driveway).
Streamed that flight live on justin.tv, for which there's an archive of the flight for
a few days if anyone cares.

ian
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Last edited by Daemon; Jul 30, 2012 at 02:05 AM.
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Old Jul 30, 2012, 02:05 AM
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rsowder's Avatar
San Francisco
Joined May 2009
1,089 Posts
Quote:
Originally Posted by Daemon View Post
It's still better to resist that urge, *especially* with a headwind.
Just this evening, I flew my X8 out 6.5 miles (new PB), and turned toward home
with 3400ft of altitude and only 1200mAh remaining in the pack. Normally
that'd be plenty as the X8 has a great glide ratio (even if only 10:1,
that's 6.4 miles on glide alone, and I know it's better than that).
That's when I discovered I had at least a 10mph headwind (was dead
calm at launch, and air I was flying in was glass smooth). That cut
my ground speed to less than 20mph effectively adding at least 7.5
minutes to my flight time, increasing total distance through the air
to over 10 miles. Was all I could do to keep from putting the nose down
a lot when I'd see the ground speed drop below 15mph. A tiny bit of nose
down, as little motor as possible and simply wait it out, and I made it all but
the last 175 yards (landed at the end of the driveway).
Streamed that flight live on justin.tv, for which there's an archive of the flight for
a few days if anyone cares.

ian
Where and how do I view your flight? I'm not families with Justin.tv.
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Old Jul 30, 2012, 02:08 AM
my karma ranover my dogma
galaxiex's Avatar
Edmonton,Canada Eh
Joined Jun 2007
7,565 Posts
Quote:
Originally Posted by rsowder View Post
Where and how do I view your flight? I'm not families with Justin.tv.
Post #10 in this thread >>> http://www.rcgroups.com/forums/showthread.php?t=1701284
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Old Jul 30, 2012, 02:12 AM
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Daemon's Avatar
Lakewood, Colorado
Joined Aug 2002
27,684 Posts
Quote:
Originally Posted by rsowder View Post
Where and how do I view your flight? I'm not families with Justin.tv.
http://www.justin.tv/daemon42/videos
The flight got chopped up into pieces on jtv (probably networking glitches)
so it's the most recent 3-4 clips (last of the day on 7/29).
[edit]Unfortunately, looks like jtv lost a big chunk of the flight
between about 5.5 miles out, and 3 miles which was kind
of the most relevant. Oh well. I've got the ground
recording but it lacks the commentary between myself and my spotter
about strategy to get home.

ian
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Last edited by Daemon; Jul 30, 2012 at 02:27 AM.
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Old Jul 30, 2012, 04:34 AM
Team Park Pilot - Airborne
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Australia, NSW, Sydney
Joined Nov 2006
4,436 Posts
Would vortex generators be beneficial to the X8s flight characteristics ?
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Old Jul 30, 2012, 06:20 AM
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Joined May 2012
66 Posts
Quote:
Originally Posted by G-Forced View Post
I remember seeing someone had gone ahead and installed a nice solid set of retracts to there 8 - I can't seem to find it now.. Are you out there ?
Yep that would be me. I have been off the air for a while due to a motor bike accident. Good news is that the occupational therapy of building my X8 means that I am almost ready to maiden. I will be posting an update on the retracts soon. Basically I chose a set of DSR-46 retracts from EPF hobbies in Tiawan. All up weight atm with battery, video kit, pan tilt, retracts motor gps arduino, osd the works is 3.2 KG.

Retract lessons.

1. Good news is that if you retract the mains toward the center of the aircraft and the nosewheel from front to back and balance the CG to be good with wheels up you get a handy way to shift the cg to the front in a spin :-) and its not much it is equiv to adding a 25c coin on the front bulkhead beam.

2. Secure the gear to plywood reinforcements ( I will post pictures).

3. Plan for some form of prop strike pritection. I chose to install a skid that retracts with the gear. Basically is decends behind the main gear for take off and landing such hat if you over rotate the skid will hit before the prop.

Here she is, covered the front in fine glass with varnish then sprayed with grey primer.
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Old Jul 30, 2012, 07:49 AM
AP-stick
ggtronic's Avatar
Montreal
Joined Nov 2005
1,587 Posts
Quote:
Originally Posted by brosius85 View Post
don't just balance it for the video - the vibrations will ruin every part of the plane ask me how i know
nice video ! that was close !


Quote:
Originally Posted by Daemon View Post
http://www.justin.tv/daemon42/videos
the flight between about 5.5 miles out, and 3 miles which was kind
of the most relevant. Oh well. I've got the ground
recording but it lacks the commentary between myself and my spotter
about strategy to get home. ian
thanks to share ... really interesting ! that was close too
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Old Jul 30, 2012, 08:38 AM
Auxerre - France
toubab's Avatar
France, Bourgogne, Auxerre
Joined Dec 2011
119 Posts
Quote:
Originally Posted by brosius85 View Post
don't just balance it for the video - the vibrations will ruin every part of the plane if you leave them. the motor will have the most problems and will have a drastically decreased lifespan. ask me how i know

https://vimeo.com/27719317
Very good job !!!
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Old Jul 30, 2012, 12:25 PM
Registered User
rsowder's Avatar
San Francisco
Joined May 2009
1,089 Posts
Quote:
Originally Posted by Daemon View Post
http://www.justin.tv/daemon42/videos
The flight got chopped up into pieces on jtv (probably networking glitches)
so it's the most recent 3-4 clips (last of the day on 7/29).
[edit]Unfortunately, looks like jtv lost a big chunk of the flight
between about 5.5 miles out, and 3 miles which was kind
of the most relevant. Oh well. I've got the ground
recording but it lacks the commentary between myself and my spotter
about strategy to get home.

ian
Very cool. Suspenseful ending. I'll try and watch your next flight live.

Randy
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Old Jul 30, 2012, 06:03 PM
Team Park Pilot - Airborne
OzparkPilot's Avatar
Australia, NSW, Sydney
Joined Nov 2006
4,436 Posts
Quote:
Originally Posted by Gusisin View Post
Yep that would be me. I have been off the air for a while due to a motor bike accident. Good news is that the occupational therapy of building my X8 means that I am almost ready to maiden. I will be posting an update on the retracts soon. Basically I chose a set of DSR-46 retracts from EPF hobbies in Tiawan. All up weight atm with battery, video kit, pan tilt, retracts motor gps arduino, osd the works is 3.2 KG.

Retract lessons.

1. Good news is that if you retract the mains toward the center of the aircraft and the nosewheel from front to back and balance the CG to be good with wheels up you get a handy way to shift the cg to the front in a spin :-) and its not much it is equiv to adding a 25c coin on the front bulkhead beam.

2. Secure the gear to plywood reinforcements ( I will post pictures).

3. Plan for some form of prop strike pritection. I chose to install a skid that retracts with the gear. Basically is decends behind the main gear for take off and landing such hat if you over rotate the skid will hit before the prop.

Here she is, covered the front in fine glass with varnish then sprayed with grey primer.
Im really keen on seeing more information as a RG might work well for my purposes but I am yet to start my X8
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Old Jul 31, 2012, 02:30 AM
Religion= suffering/wars
deTonaTor_NZ's Avatar
Joined Jan 2006
280 Posts
Ok guys, here's my almost finished self contained catapult launcher for the X8. It's designed to be put in a shoulder bag for hiking to remote places. The middle section comes out and the legs pull out.

Yet to test it out, got 17-25kgs of pull from 2-3 bungees 800mm long, that I use for my big composite glider. Fingers crossed!
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Old Jul 31, 2012, 04:37 AM
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NSW Australia
Joined Mar 2010
245 Posts
Very interested in the outcome of this.
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Old Jul 31, 2012, 04:52 AM
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Joined May 2012
66 Posts
Quote:
Originally Posted by G-Forced View Post
Im really keen on seeing more information as a RG might work well for my purposes but I am yet to start my X8
I am happy to provide any help you might need but my advice wait until I get it off the ground and back safe on the wheels hahahahahahahaha.
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Old Jul 31, 2012, 09:44 PM
Registered User
Joined Jan 2011
571 Posts
Ian is this with the BEVRC supplied motor? My X8 with the BEVRC motor and ESC bundle feels so under powered. Max airspeed was only about 30 knots.

Only drawing about 25A with 4S WOT with 12x6 Aeronaut folding props. The supplied ESC is supposed to by 70A but it doesn't look big enough to handle 70A.

My ZII does 60A with 4S WOT with Aeronaut 9x6 and does about 90 knots.

Quote:
Originally Posted by Ian Davidson View Post
Just throwing this out there to anyone who finds this of interest/help.

No thrust or pitch-speed data below I know, but I measured this yesterday using the optional motor supplied by BevRC for the X8, paired with a range of Aeronaut CAM folding props on a 3S set-up.



(I'm scratching my head slightly with the 13x11 and 13x10 comparison. I noted the exact same oddity though when comparing these props on a Scorpion motor.)
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Old Jul 31, 2012, 09:48 PM
Team Park Pilot - Airborne
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Australia, NSW, Sydney
Joined Nov 2006
4,436 Posts
Quote:
Originally Posted by Gusisin View Post
I am happy to provide any help you might need but my advice wait until I get it off the ground and back safe on the wheels hahahahahahahaha.
You first
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