Forrest Frantz
  • Male
  • Mount Hood Parkdale, OR
  • United States

Forrest Frantz's Friends

  • iSkyMaster
  • Cristian Miuta
  • Zhenming Li
  • Nicole Jordan
  • Inertial Stability Systems
  • Ketil
  • Ted M
  • Schaich Martin
  • cleninton
  • Sharath Gowda
  • Jonathan Sepult
  • Stijn Debecker
  • Marcpriess
  • Anthony James O'Connor
  • Janis Putrams

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, 2017. 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, 2017. 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

Forrest Frantz replied to David Dalmau Lopo's discussion V-Shaped Hexacopter in the group ArduCopter User Group
"The short answer is yes.  You can do complex shapes, including a simple V. I've attached a Draft instruction manual on how to change the motor factors in code.  While I wish you could change this in the parameter list, unfortunately…"
Apr 22
Jon Turner replied to Forrest Frantz's discussion Calling all Custom Multi-Copter Pilots! in the group ArduCopter User Group
"Thanks for the reply, we are working some long days right now. As soon as I can i will get some info together and email it to you. We are trying to keep it private right now. I will be in contact soon.            …"
Jan 23

Forrest Frantz replied to Forrest Frantz's discussion Calling all Custom Multi-Copter Pilots! in the group ArduCopter User Group
"Feel free to contact me directly at and provide more detail about the X8 (or if you don't mind being public then we can use the forum). If needed, I'll model the X8 config worksheet and send you a copy and send you…"
Jan 22
Jon Turner replied to Forrest Frantz's discussion Calling all Custom Multi-Copter Pilots! in the group ArduCopter User Group
"Hi Forrest, is this something you are still working on. I am involved in a large x8 with staggered front to rear rotor height, and am interested in working with someone to help configure this to fly with ph2.1. We are ready to fly now, but may need…"
Jan 20

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.
Parkdale, Oregon

Forrest Frantz's Blog

World Record Flight Achieved Using 3DR Electronics and Tiger Rotors

Posted on August 22, 2014 at 9:30pm 70 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…


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]



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,
Forrest Frantz

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,
Forrest Frantz

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,
Forrest Frantz

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,
Forrest Frantz

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.

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