The objective was to fly over 60 minutes (1 hour) without stopping to replace or recharge the batteries. This test was to prove that flying at this weight and amp draw configuration was possible. Due it success, the 140c will be able to be constructed with similar characteristics, but be able to carry twice the watt/hours.

To accomplish this 62 minute flight I needed to add an additional 5,00mAh of batteries, bringing the Raptor 140b to 15,000mAh, or 166.5watt/hours

This flight broke five MyGeekShow records:
-Longest flight: 62.4 minutes
-Furthest distance covered: 71.4km/44.4mi
-Most power consumed: 160watt/hours
-Longest total flight time by craft: 7.0 hours
-Furthest total distance by craft: 498km/309mi

 

Flight Stats:
Ground Covered: 71.4km/44.4mi
Duration: 62.4 min
Watt Hours: 159.9 (14.4Ah at 11.1v)
Avg Amp Draw: 13.9A
Avg Ground Speed: 68.7kph/42.7mph
Efficiency: 447m/Wh or 5.0km/Ah or 202mah/Km
Max altitude AGL: 116m
Max ground speed: 124kph/77mph
Max distance from ground station: 607m/0.4mi

 

See you next week!

 

-Trent

 

Safety note: I maintained line of sight during this flight, and had my controller close by to take manual control as needed. The altitude read over 120m, but elevation increased during flight. True AGL for the flight is 100-120m. I avoided all airports and populated areas.

 

Raptor 140b+ Stats:
Weight: 2280g
Max Flight Time: 70min
Max Range: 90km
Stall Speed: 35kph
Cruise Speed: 90kph
Max Speed: 135kph
Radio Range: 1.5km
Energy Carried: 167wh (15,000mAh at 11.1v)
Drive Power: 850w
Total Flight Time on Craft: 7.0 hours
Total Flight Distance on Craft: 498km

 

The equipment used---
Raptor 140 airplane: http://store.mygeekshow.com/product-p/raptor-140-kit.htm

Radio Tx: ParkeFlyer Turnigy 9x Tx: http://parkeflyer.com/
Telemtry: 915mhz 100mW 3DR http://store.3drobotics.com/products/3dr-radio-telemetry-kit-915-mhz
Laptop: Compaq Presario CG57
GPS Dongle: http://www.amazon.com/gp/aw/d/B000PKX2KA/ref=redir_mdp_mobile?redir...

Flight Controller: APM2.6 https://store.3drobotics.com/products/apm-2-6-kit-1
Reciever: 6ch FlySky http://www.hobbypartz.com/79p-r6b-receiver.html
Telemtry: 915mhz 100mW 3DR http://store.3drobotics.com/products/3dr-radio-telemetry-kit-915-mhz
Battery: (3) 5.0Ah 20C Turnigy Lipo: http://www.hobbyking.com/hobbyking/store/__9184__turnigy_5000mah_3s...
ESC: 60A Brushless http://www.hobbyking.com/hobbyking/store/__32820__TURNIGY_Plush_60a...
Motor: 3542 1450kv brushless http://hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=38700
Prop: 10x7 Carbon Fiber Folding http://www.hobby-lobby.com/10x7_carbon_fiber_cam_blade_798_prd1.htm
Servos: 11g digital http://hobbyking.com/hobbyking/store/uh_viewItem.asp?idProduct=42620
Onboard camera: http://www.ebay.com/itm/16-V2-Lens-D-808-Key-Chain-Video-Camera-/38...

 

Learn More:
Raptor Details: http://www.mygeekshow.com/theairplanes/Raptor140.html
USA Trip Details: http://www.mygeekshow.com/usatrip/

Follow the Show:
Website: http://www.mygeekshow.com
Facebook: http://www.facebook.com/MyGeekShow
Twitter: http://twitter.com/mygeekshow
Google+:http://plus.google.com/116950154481685699344
Skype: MyGeekShow
UStream: http://www.ustream.tv/channel/mygeekshow

Filmed, Edited, Produced and Published by Trent in Arkansas, USA

Views: 2024

Tags: 140, Geek, My, MyGeekShow, Raptor, Show


Admin
Comment by Gary Mortimer on January 25, 2014 at 6:14am

Only 29km to go before the badge! Well done Trent


Developer
Comment by Rob_Lefebvre on January 25, 2014 at 6:33am

Nice work again.

Would be cool if you could only carry one battery on the airplane, and then extra batteries in a drop pod.  Drop the extras on a parachute before landing the airplane.  Make the landings a bit lighter. ;)

Comment by Trent at MyGeekShow on January 25, 2014 at 6:41am

Gary: Thank you! Getting closer... :) As is, it could reach 100km, it was fairly windy that day and I had a good 10-15% of life left in the batteries. By the way, that landing is all your fault :) I've been landing closer and closer to my feet, trying to land right next to me so you'll stop heckling me :)

R-Lefebvre: Yeah! I've thought of that as well... would be pretty easy. The third 5Ah battery is right over the CG, so it can fly with 2 or 3 and not have the CG affected.


Admin
Comment by Gary Mortimer on January 25, 2014 at 7:16am

Little bit high on the amp draw I would target between 6 and 8 with a wing. How much reflex do you have? You might move the batteries back a tiny amount and reduce the reflex for a more level attitude. You might be just creating an air brake.  But I am just pulling that out of thin air without seeing it in the flesh I just have a hunch you are slightly too nose heavy, only slightly though.

You are allowed an S turn in your landing to get rid of some of the height ;-)

Also you should invest in a bungee stake (or make one) for the launch, having to turn to miss the car is not the best at low altitude low speed.

Excellent job though sorry to sound so negative.

Comment by Trent at MyGeekShow on January 25, 2014 at 8:37am

Gary: Not negative! That is great feedback... between 6 and 8 amps, is that at 11.1v? And is that getting 90-100kph? I can get the amps lower, but of course the plane cruises at lower airspeed. I'm thinking that the 140c's bigger & higher pitch prop, slower kv motor and higher voltage will add a good amount of efficiency, possibly 15%+

The reflex for the 140b is almost at zero. I've moved the CG back further than it is now and it is totally tail heavy, barely maneuverable and flutters like crazy in the wind (I'll have to share that video some time!) So the CG is at its most balanced location. Actually may be slightly tail heavy, it doesn't like the wind when it has the extra 5Ah battery.

S turns! I totally am doing that more and more, getting practice, it just a little scary, the 140b is 2.2kg on a 1.4m wing, pretty heavy and with it so CG balanced it will tip stall at 30-35 kph, although I've not tried to tip stall recently. So S-curve at slow and low is a little scary.. I should just be brave and do it : ) The 140c is going to be getting some kind of braking system, possible airbrakes or a parachute for emergencies. At that weight and low drag the thing glides for 100m+ from even 50m in altitude.

The whole launching process will be much easier with two people, which I will have on the USA trip... I'm afraid to rely on a stake as I might not be able to use one everywhere I land and take off.

Fun stuff! Thank you for the comments.


Admin
Comment by Gary Mortimer on January 25, 2014 at 8:52am

Ok well it sounds like you are on the case with reflex. As you are trying a lower speed motor bigger prop I would not change anything until that is trialed. You seem to have it dialled in and I am sure you are right endurance will increase. 

Try practicing without landing, power up and go around everytime and get used to the picture you see when the aircraft is set up for the right spot. You will find you do it automatically once the picture is in your head. Also fly circuits and get used pitch and power changes.

All good landings start with a good approach.

Comment by Carl La France on January 25, 2014 at 9:45am

Hey Trent Great Job! in flight planning we always considered the wind .It might be hard to find a route that parallels the wind but if you flew down wind you would pick up  ground speed and range Good Luck!

Comment by Trent at MyGeekShow on January 25, 2014 at 1:35pm

Gary: Very true. Will do.

Carl: Agreed! Next week's 100km flight will take this into account. I watch the wind very carefully, every day for the last 4 years. Very important, especially with these longer flights. 


100KM
Comment by u4eake on January 25, 2014 at 4:05pm

I'm crossing my fingers for your 100km flight, but it's looking good!

Comment by Swift on January 25, 2014 at 9:13pm

Thanks Trent! Great job [edited for TOS compliance]

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