Advanced search  


Who's Online
  • Dot Guests: 145
  • Dot Hidden: 0
  • Dot Users: 0

There aren't any users online.
* Site Sponsor
* Random Gallery Items
Scout Bee finished...

Views: 3365
Posted by: MarkLincs
in: Scout Bee
Gopro cutout

Views: 3375
Posted by: Coyote
in: Coyote`s Album
SlipStream FPV

Views: 2016
Posted by: Brucey
in: Photos
Vortex 285

Views: 1039
Posted by: Coyote
in: Coyote`s Album
* Latest Gallery Items
My Twin Dream

Views: 1087
Posted by: Coyote
in: Coyote`s Album
Vortex 285

Views: 1039
Posted by: Coyote
in: Coyote`s Album
Mini Talon Rebuild

Views: 1110
Posted by: Coyote
in: Coyote`s Album
Mini 3D Gimbal on MTD

Views: 1084
Posted by: Coyote
in: Coyote`s Album
Matek 405-Wing

Views: 1081
Posted by: Coyote
in: Coyote`s Album
Pages: 1 ... 6 7 [8]

Author Topic: 220mph Proximity  (Read 12100 times)


  • Wing Commander
  • *
  • Karma: 6
  • Offline Offline
  • Posts: 518
Re: 220mph Proximity
« Reply #105 on: November 21, 2020, 04:26:06 PM »

I think it was to do with speed that they wanted out of the heli or maybe it was lift. One thing to note is that commercial aircrafts have to comply with noise regs. Military aircrafts don't :-) So it could be that the tips help speed or lift but create lots of noise. Again civilian aircrafts have fuel consumption specs that they must adhere to, military aren't very bothered. Can't remember much, had a few chats over a coffee with a few of the blokes that used to work on testing the blades. Quite often when testing stuff you were never told why the tests were being carried out as that might bias the results. Some of them also worked on the Concorde engine and intake development and testing way back. Used to be some interesting conversations. There was a Red Dwarf episode where part was filmed in the test cell where Concorde intake ducts were developed!!!
I remember doing flight certification test for RR Trent 500  (civilian) and they were trying to get me to 'tweak' the thermodynamic calcs. I thought it was a bit iffy so had a chat to our mathematician to confirm that the 'tweaks' would alter things in their favour!!!! I was in charge of the data and calcs that would be submitted to CAA to gain the engine flight certification. Unfortunately we never did the chicken ingestion tests :-) Lots of water and ice but no chickens.

As for your props, way above me mate. Thermodynamics I had a reasonable understanding of, well calcs anyway not theory.
Always interesting to hear about the lengths you go to to build your crafts.


  • Flight Lieutenant
  • *
  • Karma: 5
  • Offline Offline
  • Posts: 102
Re: 220mph Proximity
« Reply #106 on: November 22, 2020, 06:56:32 PM »

Another quick test today to see amps at full throttle on 14s.. peaking around 180a.. guessing 50v under load....so, 9kw... that's 12 horsepower according to Google..through a 7 inch off-the-shelf prop!! It is so insane I can't quite make sense of it.. Some losses along the way, but that prop hub is still probably seeing 7 or 8 kw .. it's just incredible.

« Last Edit: November 23, 2020, 02:29:01 PM by omegooliebird »


  • Tape Apprentice
  • Administrator
  • Marshal of the Royal Air Force
  • *
  • Karma: 315
  • Offline Offline
  • Posts: 19756
    • My New Blog
Re: 220mph Proximity
« Reply #107 on: November 23, 2020, 06:03:27 PM »

That sounds vicious :) :)
Education and schoolin is good, but FPV is gooder :)
Pages: 1 ... 6 7 [8]

* Recent Topics
220mph Proximity by Coyote
[November 23, 2020, 06:03:27 PM]

Warning by Coyote
[November 22, 2020, 11:24:19 AM]

New Mini Talon coming? by Coyote
[November 21, 2020, 10:54:31 AM]

mini talon MFD autopilot (heading) by hellsbells1
[November 15, 2020, 01:48:15 PM]

Taranis X9D Plus 2019 Internal Aerial Problem by Coyote
[November 15, 2020, 11:03:01 AM]

How to Charge a 7.4V 2S1P 3500mAh 18650 Li-ion Battery Pack by Drone 5
[November 12, 2020, 06:01:58 PM]

Sharing My Music and Sound Effects - Over 2000 Tracks by Eric Matyas
[November 11, 2020, 10:55:10 PM]

Haven't been flying in a while so by luv2rip-fvp
[November 07, 2020, 04:04:16 AM]

Latest CAA exemptions & updates by FPVSteve
[November 05, 2020, 11:02:27 PM]

EASA - What's the latest? by ched
[October 22, 2020, 10:12:42 PM]

* Keywords
fpvhub  fpv hub
first person view video piloting

rc r/c r.c. model aircraft flight pilot fpv piloting wings fly flying flight fuse fuselage aileron tail pan tilt tx rx vtx rtx receiver transmitter video radio control controlled headtracker fpvuk bfpvmfa fpv uk first person view video piloting fpv servo servos easystar easy star multiplex antenna VR1400 fatshark video goggles 2.4 5.8 1.2 900 ghz mhz uhf panel antenna circular fpv polarised tracker dbi 10mw 100mw 500mw camera osd fpvuk bfpvmfa fpv first person view video piloting downlink ezantenna tracker gps EzOSD current sensor tiny telemetry autopilot ccd gopro kx131 kx171 FY21 FY21A FY21AP II IMU oracle diversity processor video switcher fpvuk bfpvmfa fpv uk first person view video piloting insurance simulator delta wing glider funjet quadcropter helis heli helicopter electric nitro scratchbuild scratch build batteries battery 2s 3s 4s lipo lipos fpvuk first person view video piloting Antenna fpvhub  fpv first person view video piloting rc r/c r.c. model aircraft flight pilot fpv Airframe Artifical Horizon Auto pilot Av AWG AWU Bec Brownout Buddy box C rating CG Circular Polarized Data logger Dbi Dbm Dipole Diversity DVR Easycap EPO EPP Failsafe FM Freshnel zone Frequency Gain Ghz Goggles GPS Ground Station Gyro Head Tracker HD Hz Inverted Vee Jst LC Filter Lipo LUX Mah Mhz Omni OSD Pan Patch Platform Polarization Rssi RTH Servo Spotter Telemetry Tilt Tracker Transmitter TVL Ubec UHF Video Splitter Vrx Vtx Watts Yagi  fpv uk first person view video piloting rc r/c r.c. model aircraft flight pilot fpv

http://www.fpvhub.com/forum/index.php?action=sitemap;xml http://www.fpvhub.com/forum/index.php?action=sitemap http://www.fpvhub.com/forum/index.php?action=sitemap;start=0 http://www.fpvhub.com/forum/index.php?action=sitemap;start=100 http://www.fpvhub.com/forum/index.php?action=sitemap;start=200 http://www.fpvhub.com/forum/index.php?action=sitemap;start=300 http://www.fpvhub.com/forum/index.php?action=sitemap;start=400 http://www.fpvhub.com/forum/index.php?action=sitemap;start=500 http://www.fpvhub.com/forum/index.php?action=sitemap;start=600 http://www.fpvhub.com/forum/index.php?action=sitemap;start=700 http://www.fpvhub.com/forum/index.php?action=sitemap;start=800 http://www.fpvhub.com/forum/index.php?action=sitemap;start=900 http://www.fpvhub.com/forum/index.php?action=sitemap;start=1000 http://www.fpvhub.com/forum/index.php?action=sitemap;start=1100 http://www.fpvhub.com/forum/index.php?action=sitemap;start=1200
* Disclaimer
The content, views and opinions expressed within this forum are those of the authors and do not necessarily reflect the views, official policy or position of FpvHub. However, we reserve the right to remove or edit any content considered inappropriate.