David J. Beaulieu
  • Bangor, ME
  • United States
Share on Facebook

David J. Beaulieu's Friends

  • Jack schnurr
  • John Wigginton
  • Stephen B Szalai
  • Werner Fourie
  • JTC
  • Jacob Bragg
  • Andrew Gaut
  • David Larson
  • Bob Widmer
  • Paul Henry Davis
  • Matt Crosby
  • Joshua Bardell
  • Jeremy Cowgar
  • Brian Rodriguez
  • Nelson Orta

David J. Beaulieu's Discussions

Bruce custom cover - Insulated engine cowl - $375 ***SOLD ***SOLD*** SOLD***

Started Nov 21, 2022 0 Replies

This was made for a UL350iS cowling but should work with most others cowlings as well.  Excellent condition.   …Continue

Catto Prop for sale - price drop

Started this discussion. Last reply by David J. Beaulieu Oct 10, 2022. 1 Reply

Listed on Barnstormers...68 DIA, 35" pitch 3 bladed with nickel leading edges. SAE2 with 7/16 bolts and 5/8 lugs.  Designed by Catto for use with UL350iS.  Suitable for use on O-200 or O-235 per…Continue

SOLD SOLD SOLD ---- Early style bubble doors for STOL 750

Started this discussion. Last reply by David J. Beaulieu Jul 17, 2022. 1 Reply

Two new doors with hardware, uncut, unpainted. Shipping likely a PITA. Asking $350 per or $600 for the set.DaveContinue

Stuff for Sale - Matco MCMC-5 master brake cylinders with Intensifiers, etc.

Started this discussion. Last reply by David J. Beaulieu Jul 17, 2022. 1 Reply

Help me clean out my on shelf spare parts...SOLD Brand new set, intensifiers installed by Matco - $325 and I'll cover shipping in the statesSOLD 480 Muffler with down tube for UL Power 350 (welded…Continue


David J. Beaulieu's Page

Latest Activity

David J. Beaulieu posted a discussion

Bruce custom cover - Insulated engine cowl - $375

This was made for a UL350iS cowling but should work with most others cowlings as well.  Excellent condition.   See More
Nov 21, 2022
David J. Beaulieu posted a photo

Buh bye Turtle...

...Sky Turtle's last embrace before departing with her newest owner to Connecticut. Took 4 1/2 years to build and we logged 381.5 hrs together over a nearly 5 year span with wheels, floats and skis. During that time we also enjoyed a January field…
Aug 15, 2022
David J. Beaulieu posted a photo

Floats leaving the hangar...going South

Time for someone else to enjoy these well crafted and proofed amphib floats. I got three short seasons on them with Sky Turtle and they are going to CT to be mounted on a Legend Cub Would have kept them if they would have worked with the new project.
Aug 6, 2022
David J. Beaulieu posted a discussion

Bruce's Custom Cover for 750

Extended, over the top style lightweight travel cover. New, unused except for fit check. Lists new at $495. Asking $365...may negotiate along with shipping costs?See More
Jul 1, 2022
David J. Beaulieu posted a discussion

Datum Ski set for sale

Datum 2000 Lite main ski set with wheels/tires and Nose ski 1000 with dedicated wheel/tire/front fork and extension setup.  Asking $6K USD  These are rigged with proper cable lengths, bungees, etc.  I can also provide insight and required brackets for installng on 750 fuselage for cable attach points as well as electrical switch panel/hardware for operation. This is as close to plug and play for a retractable ski install on a  750 airframe as you will find.  The set includes the two main gear…See More
Jun 8, 2022
David J. Beaulieu posted a discussion

FYI...Throttle Position Sensor (TPS)

For those of us with older engines and black box ECUs...The TPS is a mechanical rheostat style unit which outputs a voltage signal to the ECU corresponding to throttle position.  It seems that over time the mechanism can develop wear in certain positions (likely from frequent range of use or vibration related to throttle cable routing and attachment to throttle body.)  This can result in a bit of stumble or hesitation in the engine with throttle movement depending on "where" the wear has…See More
Jan 14, 2022
David J. Beaulieu posted a photo

Winter on the way?

Got the snowblower out of the hangar, winterized the floats and put the insulated cowl cover and heater to Sky Turtle. Still feels more like late October weather - just barely below freezing at night and 40s -50s during the day. We better get some…
Nov 16, 2021
David J. Beaulieu posted a photo


Quick overnight from Bangor to Caribou to visit my brother. Usually about a 3 1/2 hr drive. Flying direct got me there in 1.7 hrs
Nov 12, 2021
David J. Beaulieu posted a photo

Floats off

Sky Turtle transitioned back to conventional landing gear last Friday. Feels like a flying rocketship with 50 degree weather, half tanks of gas and no amphibs hanging underneath. Sadly, only a temporary sensation ;)
Oct 24, 2021
A photo by David J. Beaulieu was featured

Fall colors are here...

Fall colors are here...and a lot of glassy water!
Oct 13, 2021
David J. Beaulieu posted a status
"Finally went over 300 hrs on the Hobbs!"
Oct 13, 2021
David J. Beaulieu posted a photo

Sky Turtle flying again

Got the replacement cylinder head installed on Monday and accomplished engine run and test flight on Tuesday. Just in time for some Fall foliage flights on floats...yahoo!
Oct 6, 2021
Bob Widmer left a comment for David J. Beaulieu
"Morning David I'm just finalizing my order to Advanced Flight Systems (thought I'd use them as it will speed up installation of the Dynon package considerably). I believe I read somewhere that you have a "red box" i.e. a fuel…"
Sep 21, 2021
David J. Beaulieu posted a discussion

Cylinder head woe!!

Submitted for you reading pleasure...Been having gradually increasing CHT on my #4 cylinder over the past two weeks.  Last flight resulted in a immediate return to the airport at minimum throttle to maintain CHT below max limit* (just barely and in a slight descent while setting up for landing.)  *Downside of ECU is that we have no mixture to cool things down with.All this was after trying to isolate/resolve the issue by verifying/troubleshooting probes and a new injector with no improvements…See More
Sep 12, 2021
David J. Beaulieu posted a discussion

Ray Allen POS-12 wiring

I have the POS-12 laying around so thought I would fabricate mount and linkage to have the position sensor give my Dynon setup a signal for flap position.  The POS-12 is simply a 0-5K resistor pot.  I have 5V and ground wires from the Dynon EMS as well as the general purpose input pin/wire ready to wire to the POS-12.  The POS-12 has three wires; white/blue, white/orange, and white/green.  Th white/green is the signal wire.I cannot find which leads of the POS-12 accept the positive and ground…See More
Aug 17, 2021
David J. Beaulieu posted videos
Jul 29, 2021

Profile Information

Aircraft Model
Project Status
Building From
Engine installed (or plan to install)
UL Power
Building Experience
Have already built an airplane
Flying Experience
Commercial / CFI
Building and Flying Info / Your Profession / Other Background Info
Retired Military Pilot / Engineer by Education / Retired Commercial Pilot

Loving the "Great North Woods" of Maine
Home Airport (ie. KMYJ)
KOLD (Old Town, ME)

David J. Beaulieu's Blog

A Zenith Builder in Ghana

Posted on March 24, 2018 at 9:30pm 3 Comments

Interesting clip regarding a couple of people mentioned within our forum previously...inspiring!


David J. Beaulieu's Photos

  • Add Photos
  • View All

David J. Beaulieu's Videos

  • Add Videos
  • View All

Comment Wall (15 comments)

You need to be a member of Zenith Aircraft Builders and Flyers to add comments!

Join Zenith Aircraft Builders and Flyers

At 9:07am on February 15, 2023, Jack schnurr said…

David, I built my 750 STOL and completed it seven years ago. I live in alaska and some of the legs I fly are 3 hrs long. I am 82 yrs old and get tired. I need an autopilot. I saw a set of brackets on line that you made, Is it possible to buy the brackets and/or kit from you so I can install an auto pilot?  I really appreciate any help that you can give me. Thank you so much. 

At 12:10pm on September 21, 2021, Bob Widmer said…

Morning David

I'm just finalizing my order to Advanced Flight Systems (thought I'd use them as it will speed up installation of the Dynon package considerably).

I believe I read somewhere that you have a "red box" i.e. a fuel flow transducer in your UL engine/Dynon system - as I understand it you need 2 transducers, 1 to the engine and 1 calculating the return flow so the Dynon calculates actual usage.

Anyway, if I install 2 transducers do I need to, or do I want to, install Zenith's fuel gauges in the tanks?



At 6:34pm on June 2, 2021, Bobby Allen Pepper said…

David, very impressed with and very interested in purchasing a set of brackets for Dynon auto pilot for my Zenith 750. Already have all except brackets. Please email Allen at apepper72@gmail.com. Thanks.


At 8:31am on October 6, 2020, Nelson Orta said…

Hi David,

Thanks for wanting to share your knowledge with me.

I’m in your same time zone, anytime that is good for you to call me works for me.



(305) 525-7803

At 7:17am on July 5, 2020, Daniel Booker said…


sorry about delay, not good on this Zenith site!  Looking to get a set of Zenair plans to install my floats. Do you have a set I could purchase/copy?  Thanks,


At 3:28pm on December 22, 2018, Wayne Woloshin said…

Hi David, I am curious about your UL Engine , what was the problem that you have to change the #3 Cylinder . And how many hours on your Engine. Tks Wayne 

At 6:01pm on January 10, 2018, Thomas Jackson said…

David, I saw that you are interested in Datum skis. I have been flying with the skis for 4 years and am very satisfied with them. If you have any questions forward them to me and I will be gald to answer the best as possible.


At 5:45pm on November 28, 2017, Danal Estes said…


You asked what we were seeing with the bad injector.  The above is typical.  #3 cylinder just was "not tracking" with the others. 

Digging a little deeper, it is a bit hotter than others at idle (lean, where everything should be very rich), gets even hotter if the power is up only a tiny bit (even leaner), and actually "goes cold" when the power is advanced anywhere above about 1500 RPM, because it gets so lean it is not burning. Too lean for the plugs to ignite. 

And... we thought this was a bad injector for a long time.  After chasing down similar problems several times, we came to the conclusion the injectors were fine... that the ECU had an inadequate ground.  


First, check that all EGTs and CHTs "Track" each other in ALL conditions before first flight. 

Second, check for very, very, very good grounds in an airplane that is so dependant on electronics. DO NOT count on the frame.  Strap and/or "Star" (i.e. home run wires) everything. 

Feel free to ask questions. 

P.S. Graphs produced from Dynon logs via custom software that I wrote.  Feel free to send me a log file if you want it graphed. 

danal (dot) estes (at) gmail (dot) com

At 11:23pm on August 5, 2016, Kurt Satter said…


You can reach me about the charger at ksatter@Verizon.net ...  I can get it off to you by Monday.

At 9:24pm on May 16, 2016, Doug Malloy said…

Hi David. Hey, need to ask you about your experience with the Skytek tank. I talked to Keith at Skytek and watched the Rotax videos and am impressed with the product. Not impressed with the price and not sure about the 1 gal capacity. They say 7 and half minutes at full power for a Rotax engine if you are down to just the header. Assume then for a UL it would be about half that. I plan on a UL350is. I have seen the pics on your installation but do you still think this tank is the way to go?


New from Zenith:

Zenith Planes For Sale 

Classified listing for buying or selling your Zenith building or flying related stuff...

Custom Instrument Panels
for your Zenith

Custom instrument panels are now available directly from Zenith Aircraft Company exclusively for Zenith builders and owners. Pre-cut panel, Dynon and Garmin avionics, and more.

Zenith Homecoming Tee:

Zenair Floats

Flying On Your Own Wings:
A Complete Guide to Understanding Light Airplane Design, by Chris Heintz

Builder & Pilot Supplies:

Aircraft Insurance:


West Coast USA:

Pro Builder Assistance:


Transition training:

Lavion Aero

K&S Aviation Services

Aircraft Spruce & Specialty for all your building and pilot supplies!

How to videos from HomebuiltHELP.com

Developed specifically for Zenith builders (by a builder) these videos on DVD are a great help in building your own kit plane by providing practical hands-on construction information. Visit HomebuiltHelp.com for the latest DVD titles.

© 2024   Created by Zenith.Aero.   Powered by

Badges  |  Report an Issue  |  Terms of Service