MR60
Forrest Frantz
  • Male
  • Mount Hood Parkdale, OR
  • United States
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Forrest Frantz's Friends

  • Cristian Miuta
  • Zhenming Li
  • Nicole Jordan
  • Inertial Stability Systems
  • Ketil
  • Ted Markson
  • Schaich Martin
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  • Jonathan Sepult
  • Stijn Debecker
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  • Anthony James O'Connor
  • Janis Putrams
  • Artem Tokmakov
  • Gerardo Rodriguez

Forrest Frantz's Groups

Forrest Frantz's Discussions

Max mag field length--Why A Max?

Started this discussion. Last reply by Janis Putrams Feb 15. 6 Replies

Why a maximum value of 550? I understand intuitively why there would be a minimum value.We typically see less than 6% mag field interference, but always get nailed by the max mag field length. Values…Continue

Tags: field, magnometer, magnetic, Forrest, mag

Vibration--Finally Solved ... The Frantz Strut

Started this discussion. Last reply by Steve Feb 15. 88 Replies

Well ... at least until the next discovery.(sorry about the delay on this post ... the site was down for quite a while)Definitions.-          FCU is the Flight Control Unit (e.g., Pixhawk or…Continue

Tags: isolation, hover, damper, strut, Frantz

Wire Sizing for Your Project

Started May 7, 2016 0 Replies

The original Wire Sizing worksheet was for ships with a short life span (world record setters, FPV racers, prototypes, etc). Now the worksheets has been updated to also account for Ampacity.Ampacity…Continue

Tags: AWG, ampacity, Frantz, Forrest, sizing

Irregular Shape Multicopters - Custom Ardurino Code

Started this discussion. Last reply by Forrest Frantz May 12, 2016. 8 Replies

This is how you modify Ardurino code for custom irregular shaped ships. There is no need to modify code for a ship with a frame that is laid out like a:- coaxial triangle- square or rectangle-…Continue

Tags: V, frantz, spider, irregular, code

 

Forrest Frantz's Page

Latest Activity


MR60
Forrest Frantz left a comment for Petr Dvorak
"send to my private e-mail forrestfrantz@gmail.com"
Mar 6
Cala replied to Forrest Frantz's discussion Vibration--Finally Solved ... The Frantz Strut
"Where you buy in Europe Hugues?"
Feb 15

MR60
Forrest Frantz replied to Forrest Frantz's discussion Vibration--Finally Solved ... The Frantz Strut
"Do the updates.  They are generally stable.  I've only had to go backwards a few times and it was only because I'm doing some pretty rare stuff. On APM.  If a ship flips, it has nothing to do with APM firmware.  The…"
Feb 14

MR60
Forrest Frantz replied to Forrest Frantz's discussion Max mag field length--Why A Max?
"Low drift gyro???"
Feb 13

MR60
Forrest Frantz replied to Forrest Frantz's discussion Max mag field length--Why A Max?
"Great link. - MaxMagField = maximum of mf(index) - where index = 0 to length, where length = the number of observations from the flight - mf = sqrt(mx^2 + my^2 + mz^2) or the 3-D distance (magnitude) of all three components - mx, my, & mz which…"
Dec 22, 2016
Jon replied to Forrest Frantz's discussion Max mag field length--Why A Max?
"I also have problems in this area. Yesterday I did the normal compass dance and was quite pleased with offsets at -11, 2, -35. Flew my quad and put the log through Mission Planner's Auto Analysis with the result Compass = good mag_field within…"
Dec 22, 2016

MR60
Hugues replied to Forrest Frantz's discussion Max mag field length--Why A Max?
"Same issue here. With latest 3.4, and latest mission planner auto log analyzer, I also get very good & low magnetic interferences but extremely high max magnetic field length, above the recommended value. My compass is external (internal…"
Dec 21, 2016

MR60
Forrest Frantz posted a discussion

Max mag field length--Why A Max?

Why a maximum value of 550? I understand intuitively why there would be a minimum value.We typically see less than 6% mag field interference, but always get nailed by the max mag field length. Values are typically 680 to 790.The integrated compass/mag is on a long multicopter with more than 8" space to the battery and motors. Running a compass around the mag shows little to no interference.Mag calibration (only the external enabled) usually brings up values like -120 -50 80 ish.What is "Max mag…See More
Dec 21, 2016

MR60
Forrest Frantz commented on Forrest Frantz's blog post World Record Flight Achieved Using 3DR Electronics and Tiger Rotors
"read the Vibration blog where the sheet is located.  it's discussed there.  the key is to achieve: - Low vibration levels (< .1 g) for all three axis - High stability levels (< .5 degrees for all three axis)"
Dec 2, 2016
Zhenming Li commented on Forrest Frantz's blog post World Record Flight Achieved Using 3DR Electronics and Tiger Rotors
"Thank you for uploading the hover analysis sheet. May i also know if there is an introduction to how to make use of this sheet? for example, how do i read and draw important information from the graph and etc?"
Dec 2, 2016

MR60
Forrest Frantz commented on Forrest Frantz's blog post World Record Flight Achieved Using 3DR Electronics and Tiger Rotors
"Just added the update to the Vibration forum.  Yes, it is for the community to use as they wish.  If you make improvements, let me…"
Dec 1, 2016

MR60
Forrest Frantz replied to Gary McCray's discussion Vibration Isolation and Dampening of APM / PX4 for version 2.9
"Latest Hover Analysis. Added the following to the 'File Config Data' tab to give more control over identification of the actual hover for better comparative results when testing. - MinThrottleHover - HoverPrecision - MinSampleSize"
Dec 1, 2016

MR60
Hugues replied to Forrest Frantz's discussion Vibration--Finally Solved ... The Frantz Strut
Nov 18, 2016

MR60
Forrest Frantz replied to Forrest Frantz's discussion Vibration--Finally Solved ... The Frantz Strut
Nov 18, 2016
Alexey Degterev replied to Forrest Frantz's discussion Vibration--Finally Solved ... The Frantz Strut
"Hi, vibration on Z axis"
Nov 18, 2016

MR60
Hugues replied to Forrest Frantz's discussion Vibration--Finally Solved ... The Frantz Strut
"hello, can you post your Z axis vibrations? from the XY graph above it says your Z is way too high (fluctuates by 6 around 10) "
Nov 18, 2016

Profile Information

About Me:
Husband, father of two girls, and retired Boeing Associate Technical Fellow.
Please tell us a bit about your UAV interest
Building an OctoCopter photography platform for heavy and large camera long-duration flights.
Hometown:
Parkdale, Oregon

Forrest Frantz's Blog

World Record Flight Achieved Using 3DR Electronics and Tiger Rotors

Posted on August 22, 2014 at 9:30pm 71 Comments

It's official.  Guinness World Records validated the flight (see link under Flight 1).

Two flights were achieved to demonstrate that multi-rotor aircraft can stay in the air carrying a payload for a long period of time.  While 20 minute flights were considered long in 2014, these…

Continue

World Record Duration Flight Using APM 2.5 (Nov 2013)

Posted on November 26, 2013 at 10:00am 2 Comments

1 hour 20 minutes - APM 2.5 takes the world record for Multi-Copter Duration of Flight powered by a rechargeable battery. [note: other records exist for hover]

Flight…

Continue

Comment Wall (15 comments)

At 6:17am on September 27, 2013, Victor Correia said…

Regarding your question, I have a quad so no personal experience with neither hex nor octa.

My decision to build a hex was basically to reduce the cost and have slightly larger unobstructed angle of view for the camera. Did consider the Y6 configuration but got cold feet when I found negative comments about loss of payload capabilities.

Now that I've seen your latest project, I want to reconsider the design.

The additional cost associated to the octa (versus hex) becomes less important now with the possibility of having a 120º field of view.

At 6:52am on September 27, 2013,
MR60
Forrest Frantz
said…

I'll be glad to support no matter what your decision.

If you want a design tool, like the excel CAD, post a reply in the BYO blog so when i answer it, others will find it too. let me know if you are interested in octa or hexa because they are different worksheets.  these tools are still in a rough shape.  but i'll work with you to improve them if you are interested.

you nailed the disadvantages of the octa.  the primary advantage is recovery.  when you lose a motor (or two), the octa doesn't really care.  with the X2, yesterday it took off just fine with only 7 motors.

At 7:13am on September 27, 2013, Victor Correia said…

In your X2 design the overlapping tubes are great for structural stability but, and I'm only guessing, isn't there a problem due to the height difference between rotors?

At 8:34am on September 27, 2013,
MR60
Forrest Frantz
said…

At 8:10am on September 28, 2013, rjc_quadcopter said…

Keep it posting. Everytime I read your posts I learn something. I am also building a quad-- regular configuration. Mission is to carry gopro and to shoot our surf trips with flight time of 15mins. A bit heavy quad thou.

At 9:26am on September 28, 2013,
MR60
Forrest Frantz
said…

so if you are surfing, you want something small, agile, that floats like a quad?  do you have a design?  are you going to start with a kit or build from scratch?

At 6:51pm on September 28, 2013, rjc_quadcopter said…

My design is an all aluminum frame. I already cut the parts and currently building the frame. It has got a 560mm motor-motor distance.

At 6:39am on September 29, 2013,
MR60
Forrest Frantz
said…

perfect size.  that will be plenty agile.  and Al is the next best thing to composite.

if you run wires outside the al tubes, you can seal both end of the tubes to help it float or just use an appropriate amount of pool noodles for landing gear ... not that you will want to land it in the ocean, but recover it.  water does not destroy DC electronics (with really small props it would run just fine under water) as long as you get the salt way from the steel parts soon enough.

you might want to add a discussion and assign it to general.  you will get lot's of ideas to embrace or mace.

a discussion on sand versus motors would also be good.  some motor housing are somewhat closed and some are wide open (like mine).  Which is better?  Easy In/Out or Hard In/Out?  Maybe sand flies just carry a canister of air blast with them.

At 8:07pm on November 5, 2013, Marc Baptista said…

Forrest, I'm following up on your request to repost and your offer to assist with info and suggestions for my first (ever) quad build... Thanks in advance.

At 10:46am on November 7, 2013, Ivan Tan said…

hi, i need your help again. this is a link to my new problem. thanks.

http://diydrones.com/forum/topics/problem-with-position-control

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