Q- HOW IS THE STRONG ELECTRIC PITCH TRIM ATTACHED TO THE ELEVATOR ?.
A- THE STRONG ELECTRIC PITCH TRIM IS NOT DIRECTLY ATTACHED TO THE ELEVATOR. SEE DIAGRAM.
Q- CAN I ATTACH THE STRONG ELECTRIC PITCH TRIM TO THE PLANS PITCH TRIM BELLCRANK ?
A- THE STRONG ELECTRIC PITCH TRIM IS 20' LONG INSTALLED. THERE IS INSUFFICIENT ROOM BETWEEN THE EXISTING PITCH TRIM BELLCRANK AND THE FWD. FACE OF THE INSTRUMENT PANEL.ONE OF THE REASONS I DESIGNED THE ELECTRIC PITCH TRIM WAS TO FREE THE CENTER OF THE INSTRUMENT PANEL SO I CAN MOUNT THE AVIONICS STACK IN THE PANEL CENTER AND BE ABLE TO REACH ALL ITS DIALS WITHOUT HAVING TO LEAN FORWARD.
Q- IF I LOSE ELECTRICAL POWER, WILL I STILL HAVE PITCH CONTROL ?.
A- YES! YOU RETAIN CONTROL EVEN WITHOUT ELECTRICAL POWER. YOU SIMPLY PUSH OR PULL ON THE CONTROL STICK TO OVER RIDE THE SETTING AND MAKE YOUR CONTROLLED LANDING.
Q- WILL THE TRIM SETTING CHANGE UNDER LOAD,AS IN SLOW FLIGHT WITH A HEAVY FRONT SEAT LOAD AND DURING HIGH SPEEDS ?.
A- THE STRONG ELECTRIC PITCH TRIM USES A STEEL LEAD SCREW ACTUATOR AND WILL HOLD THE SET TRIM UNDER ALL CONDITIONS.
Q- IS YOUR PITCH TRIM DESIGNED FOR COZYS ONLY?.
A- NO! I HAVE INSTALLATIONS IN VERI-EZ, LONG-EZ, COZY- III, MKIV, BERKUT,E-RACER and DRAGONFLY.
Q- DO YOU HAVE A MANUAL TRIM IN CASE OF AN ELECTRICAL OR MECHANICAL MALFUNCTION ?.
A-NO!, EXHAUSTIVE TEST FLIGHTS HAVE BEEN MADE TAKING OFF
AND OR LANDING WITH THE PITCH TRIM SET AT MAX. NOSE UP AND NOSE DOWN POSITION.
THE AIRCRAFT A COZY III WAS FULLY CONTROLABLE.IN THE EVENT OF AN ELECTRICAL
FAILURE, A LANDING MUST BE MADE.IF THE CAUSE WAS DETERMIND TO BE THE PITCH TRIM
A COLLECT PHONE CALL(760)-254-3692 WILL BRING YOU A REPLACEMENT UNIT OVER
NIGHT.
REF.PILOT REPORT;COZY NEWS LETTER #59
News letter # 59 We had one of the first installation of Alex Strong's Electric
Pitch Trim, which
we were evaluating for builders. It worked fine in Arizona in the spring, but
when we were
flying across the northern states from Washington to Oshkosh at high altitude
where it was
cold, it stalled out on us and we could not adjust it to cruise after climbing
to altitude. We
called Alex and told him about this, and he offered to fly to Oshkosh to
replace the unit with
one that had a finer thread on the lead screw. We told him it wasn't necessary,
just send it to
us and we would replace it. He did, but we decided to wait until we got
home. In the
meantime, Alex found a more powerful motor, which he sent to us at no cost, so
we installed
the new motor in the new unit and it has worked just fine since then. We
were very
impressed with Alex's design and support, and highly recommend his unit.
(There were 20
units already purchased at this time, all were upgraded at no cost to the
buyer…Alex) *** We
are now listed as an authorized vendor by Nat Puffer
"http://www.cozyaircraft.com/" MKIV N
,SPT# 003
Q- What type of Switch do you recommend to control your Pitch Trim ?
A- I recommend the "Hat" switch if you have it mounted on your control stick. If
your control stick does not come with a "Hat" switch then I recommend the
Sub-mini rocker (on) off (on) from Radio Shack which I have on my COZY III. It
is
a special order P/N RSU 11336567. Some Pitch Trim users have mounted a
toggle switch on the panel where the plans Pitch Trim lever was mounted, this
however is a compromise as when you try to trim the airplane in any kind of
turbulence it is next to impossible to make a small trim setting since your hand
is unsupported, while the stick mounted switch allows you to make small
precise trim adjustments that this device is capable of making by using your
thumb.
See photo Right control stick;
When Dave Nelson contacted me about installing a Strong Electric Pitch Trim on his Velocity STD-RG I sent him a COZYIV unit so he could find a location for mounting.
The COZYIV unit is 20” long from the motor mount to the rod end at the end of a square piston rod. Dave`s VELOCITY STD-RG has a single control stick mounted on a center console.
He wanted to install the Pitch Trim rod end to the bottom of the control stick and the motor aft of the stick, How ever the speed brake servo is just 19 ½” aft of the stick so that was not an option and the NG mechanism took up most of the room fwd of the stick.
I then redesigned the over ride assembly by removing the piston and piston rod and replacing them with a shuttle which attaches to the bottom of the control stick between 2 springs. In so doing we reduced the mounting length from 20” to 14 ½”
The redesign caused the over ride assy. to extend 4 ¾” forward of the control stick and could contact the side of the keel when using the ailerons hence, it was important to mount the over ride assy. as close to the bottom of the control stick.
Power is supplied by a 12VDC motor through a planetary gearbox with an output of 115 RPM and adjustable to a max of 44 inch pounds of torque.
Rotary motion is translated to linear action by a 5/16”-24 lead screw press fitted to the motor shaft and secured with a roll pin. The lead screw is threaded in to an MSD(lubricant) filled nylon nut which is pressed into the over ride tube.
An MSD nylon shuttle is located between matched springs within the tube. The other end of the tube is sealed with a nylon plug. Both ends of the tube are rolled for security bolted and safety wired..
A control stick adapter is fitted to the shuttle and bolted in place.A common bolt secures the Pitch Trim to the control stick and the elevator torque tube.
In flight after you set the trim you can over ride the set trim by simply pushing or pulling the control stick. When you release the control stick the set trim will be restored.
An elevator trim indicator was thought to be neccessary when I designed the original Pitch Trim for the EZs. However since the elevator is visible from the cockpit and you only have to set the Trim for take off, then you only trim to remove pressure from the control stick the idea was not incorporated.
Price $280.00 check or money order post paid within the USA
Check to; Alex Strong
P.O.Box 1316
Yermo,Ca.92398
