Wednesday, June 13, 2018


We have received our latest prices for Taylorcraft Hydraulic Brake Kit from Grove Aircraft and our other suppliers.  Call us today to order yours.

Thursday, May 11, 2017

C85 Stroker - Which Prop Can I Use?

This issue has been a source of dilemma or misunderstanding for some.   I get a lot of questions on this.

Legally you must use the same propeller as a C85 and adhere to the same RPM limits as a stock C85 because the C85 stroker STC does not change the Certified engine rating.  

On paper, it is still a C85.  

I am not aware of any FAA approved power curve for the STC modified stroker configuration. When requesting such from Don's Dream Machines or Aircraft Specialties (the STC holders) I have been turned away but was told that "this engine is much more powerful than a stock C85".  I've even been told just how much power the engine produces on the dyno. 

Of course we all understand that because of the physics of engine performance regarding displacement theory (RPM/bore/stroke) more power will be produced. Don't get me wrong.  I love the guys at DDM and ASSI, but I must ask: What good is it to know the engine makes 108 hp on the test stand if you have no legal authority to operate it that way?  My issue as a DER is that without a certified power chart, there is no legal avenue to approve any propeller that might maximize the performance of this engine configuration. The approved data to go there has never been developed as far as I can tell. 

In my opinion, the FAA and STC Applicants did us all a dis-service by not requiring an official engine calibration test to re-rate the modified configuration. I am sure the reason this wasn't done is because doing so would have required the STC applicant to run 150 hour endurance test followed by 150 hour durability test to prove all parts out to the higher rating. I get that this is a money issue. But the flying public deserves to at least understand the realities they face. 

So we (the industry) are left with 2 choices. 

1.  Legally run the same propeller as a stock C85, not knowing exactly how much power you have, but at least assured you have equal or better performance than the stock C85 and have the comfort of staying legal. 

- or- 

2. Illegally running another propeller that optimizes the capability of the engine. Climb and cruise fast not having (Approved) assurance that the engine parts are going to survive to TBO. Be mindful that if you choose to operate this way, the STC holders, prop makers, and engine overhaulers are not likely to warranty an engine or propeller with apparent fatigue issues. Beyond this, I know that insurance companies and defense attorneys use expert witnesses who can tell when they see evidence of over-stressed and prematurely fatigued engine parts. All I am saying is... choose wisely. 

I believe there are many folks out there running illegal configurations, without knowing it... or without an understanding of the issues. I hope this article helps some of you out. 

Do I think the stroker engine is a good thing?  Well I do. It seems to be a most efficient engine. I would just appreciate having the legal avenue to use it to its full potential. The saving grace here is that these little 4-banger Continentals seem to be made of long-lasting bulletproof parts. And generally they're used on small-very forgiving airplanes affectionately thought of by many as just "barely" capable of killing you. 

Final thought:  Do you think Continental Motors never thought of this configuration?

Saturday, July 2, 2016

FAA-TSO Power Socket Receptacle Box


Certified Aeronautical Products, LLC is proud to announce that we have completed the development of our new  Power Socket Dual-Receptacle Box.  Available in 12VDC or 28 VDC with FAA-TSO approved parts or Experimental parts.

  • Two separate receptacles per box - power for up to two (2) devices
  • Mates with standard cigarette lighter style adapter plug.
  • Overall dimensions 2.5" x 2.7" x 5.8" 
  • Durable Box construction from 2024-T3 Aluminum Sheet 0.040 thick.  
  • Pre-wired with 14 ga. aircraft wire MIL-W-22759-14-9.  (24 inch wire pigtail leads)
  • Recommended for use with two 15 Amp Circuit Breakers
  • Overall Weight: 9.5 ounces (including wire leads) 

This power socket dual-receptacle box is perfect for portable GPS systems, Cell Phone Chargers, Laptop Power Supplies, or anything you would plug into your car during a road trip.
  • Power Sockets by Lone Star Aviation Corp.  -  FAA-TSO-C71 Approved
  • Box assembly drawing FAA-DER approved for major alteration
  • Box assembly parts fabrication/quality subject to acceptance as Owner Produced Parts 
  • Box assembly parts PMA pending   

Ideal for General Aviation, Vintage aircraft, and Home-builts.
  • May be permanently mounted (customer must supply fasteners)  -   or  -  
  • May be temporarily mounted using hook and loop fabric fasteners (Velcro).

Standard Prices:

FAA-TSO Approved p/n 1161-45:   $  325.00
EXPERIMENTAL p/n 1161-45X:   $  199.00

plus shipping

specify 12 or 28 V

Introductory Sale Prices:

FAA-TSO Approved p/n 1161-45:   $  279.00
EXPERIMENTAL p/n 1161-45X:   $  169.00

plus shipping

specify 12 or 28 V

Until August 15, 2016

TO ORDER: CALL (254) 715-4773


DOCUMENTATION: click here for Lone Star Data

Thursday, June 23, 2016

VINTAGE WHEELS - How long will they last?

On April 23, 2016, My beloved Taylorcraft turned 70 years old.  Looking at the log books, It has accumulated 4,335 hours total time since new. For its entire life, the airplane has resided with various owners in Central Texas.  I have known of the airplane since the mid 1970's.  And so I am aware that most of the years since, it has been continually hangared.... about half that time in an insulated hangar, about 20% of that time tied down outside on an airport tarmac, and the other 30% of the time in a sheltered open air T-hangar.

I am not absolutely certain that the Shinn wheels are the original ones on my plane, but I have no reason to believe that the wheels on this airplane have ever been changed.... until last annual.  I have no idea how many landings they have had over all these years, but it must be a lot.  And hard landings.... groundloops.... well I am responsible for quite a few since this is the airplane in which I first learned tailwheel flying as a teenager.

So how old are your wheels? Do you know their history?  How many hours or, more importantly, how  many landings have they had?  How close have you been looking at them on your annual inspections?  Or, does your I.A. look at them closely?  How about the wheel bearings?  Have you ever found them worn or with signs they've been chattering or grinding?  And when you replaced those hardened steel bearing races, how did you get them out of their aluminum (or magnesium) boss?  Thinking back, I went a lot of years as a rather inexperienced mechanic in training and it is entirely possible, although I don't recall for sure, that I might have used screwdrivers, hammers, and other less-than-proper tools for the job.

What I am getting at is this.  Our old vintage wheels have likely had a pretty rough life.  If it weren't bad enough that they have probably been subject to poor and corrosive environmental conditions, hard landings, blown tires, side loads (groundloops), numerous cycles of bearing spin-up loads; it is entirely possible that they've been abused by green-mechanics or well-meaning owners.  And that's not to mention they're all subject the natural process of Age-Hardening that occurs over time to cause aluminum (or magnesium) to become brittle with age.

I heard about a Luscombe awhile back that rolled up due to a wheel problem.  Also an Aeronca owned by one of my friends had a wheel let go.  I don't know the cause of the Luscombe issue, but my friend says his wheel had some casting flaws (voids) from which cracks propagated until the eventual failure which occurred on the runway (on landing roll-out I think).  He's had plenty of damage occur and he's lucky he was not hurt himself.

The following are photos of the Left wheel from my Taylorcraft.  Upon removal to re-pack the bearings at my last owner-assisted annual, my good friend and I.A. called me over to take a look.  Lo and behold!!!! He'd found a crack.  The photos show the story.


So to get my plane back into the air, another Taylorcraft owner (My good Friend Greg House) came to my rescue with a used Shinn wheel that he had bought at a fly/flea market or ebay or somewhere.  I received it in the "as removed" condition with absolutely no record of what it came off of, let alone how many hours/landings it had.

So I cleaned 'er up via media blast and set out to inspect, alodine treat, and zinc chromate primer paint the two halves.   Once I got to inspecting it, guess what!?!?!  Well it had some imperfections of its own.  I am unsure whether I am seeing corrosion or casting anomalies.  I am more leaning toward declaring it casting voids.  But either way, these imperfections are cause for concern.  Let us know what you think.

 Have you inspected your Vintage Wheels lately?

Finally - It needs to be said.... This is not just a Taylorcraft / Shinn Wheel issue.  It goes for Aeroncas, Luscombes, Wacos, and all.  Here is a photo recently shared on the Luscombe Facebook page.  The submitter says it is a Cleveland DMB wheel, which is found on many light airplanes.  Don't wait for an AD.  We highly recommend you check your wheels with increasing frequency as time goes on.

Be safe!!! 

And...... Keep the Antiques Flying!

Tuesday, June 7, 2016


Certified Aeronautical Products, LLC is proud to announce the availability of New FAA-TSO Approved Wheels & Hydraulic Disc Brake System parts with FAA-DER Approved Installation Drawings.

In collaboration with Grove Aircraft Landing Gear Systems, Inc, we have developed the ideal wheels and hydraulic brakes to replace the Taylorcraft's 70+ year-old mechanical Shinn brakes. This kit has everything you will need to retrofit your Taylorcraft B-Series or F-Series aircraft.

Standard List Price (updated 06/18)
$  4980.36



Because: Simplicity We have taken care of all the fittings and hardware details and we've hunted down the best available TSO Hoses.  We have completed the exhaustive task of substantiating this installation to the applicable FAA / CAA regulations for Taylorcraft airplanes.  This includes analyses and testing to assure compliance with all requirements. We cover all the paperwork.

Because: FAA Approved  No STC Required.  No Field Approval.  Simply have your I.A. execute a standard FAA form 337 referencing our FAA Approved Data.  This is known as a Major Alteration (337) with DER support.

Because: All New Parts - Every piece of this system is brand new.  The old Shinn wheels and brakes have served our beloved Taylorcrafts for all these years.  Some folks hate them. Others have learned that with the right tinkering and adjusting every so often, they work great. But have you inspected yours lately?  Those 70+ year-old castings aren't going to last forever.  On my 2012 annual inspection, I actually found a cracked wheel.  I am glad I found it before it broke.  That would have ruined my day/week/year or even worse.  In my case I was able to find a used spare wheel.  Here's how it looked.  Lord only knows how many hard landings and hours this thing has had in its lifetime.  Oh, how I was wishing new parts were available then.


Because: Reliability - Hydraulic Disc Brakes are the international standard braking system throughout the aviation industry for new aircraft of all shapes and sizes.  Virtually every FBO, every mechanic, every repair station understands hydraulic disc brakes.  Maintenance is simple...  generally just keep the reservoir topped off and take a good look every annual inspection, and you're good to go.  Perhaps you may need replacement o-rings or brake pads every so often.  But thats about the worst case scenario. And if so, parts are stocked on the shelf at Grove Aircraft Landing Gear Systems, Inc. and many other supply houses.  Piece of cake.  And, with Grove, you know they've proven themselves.

Because: Engineering -  We at CAP teamed up with Grove to properly size the hydraulic cylinders specifically for the Taylorcraft B-Series airplanes. They're just right with the perfect pedal pressure.  And... Yes.... you keep your original heel brake pedals.  Many have concerns about hydraulic brakes causing tail draggers to flip over on their back.  It can happen, no doubt.  But it happens with mechanical brakes too.  We've worked hard and tested this system to ensure they are right.  You'd really have to stomp on those heel pedals at a fast rate of speed to have trouble.  Face it.  Tail wheel airplanes require a proper skills and proper attention.  This system is no more demanding than any other vintage 2-place light planes.  Yet they are rugged to withstand all demands, from tundra flying to everyday training.

Because: They're just right!  In fact, they are so perfectly matched and neatly installed that many probably won't detect any differences upon first look at the airplane.  Sure, a really trained eye will notice those calipers down on the wheels.  But they look like they belong.  Inside the airplane, you cannot see anything different.  Everything is neatly tucked away under the floor.  And when you fly with these wheels and brakes, we are pretty sure you will hardly notice a difference, other than solid / predictable / reliable performance.  Press the pedal and they are there when you need 'em.  Not too much. Always there.

Some Assembly Required - Owner Produced Parts (OPP).  While all of the major components of this kit are either FAA-TSO approved or standard hardware items, there are just a handfull of the minor parts that are provided without fabrication/quality approval. Our DER provides FAA approval of the design data.  CAP supplies the parts as unfinished parts.  Fabrication and quality verification is to be completed as Owner Produced Parts.  This means that the owner must take part in the final quality acceptance and verification that the parts are fabricated in accordance with the FAA approved design data. The owner must make a logbook entry to close the loop.  Here is a list of the OPP required parts.

Brake cable assembly, 2 ea.
Pulley bracket assembly, 1 ea.
Cylinder bracket assembly, 2 ea.

Pulley / Cylinder Brackets (See OPP Notes)

CALL TODAY to place your order.  (254) 715-4773


EMAIL your Taylorcraft serial number to

Tuesday, May 17, 2016

Larry and Ilse Harmacinski's DH.60 Gipsy Moth

We at CAP are continually amazed by the gorgeous work being done by our customers.  Larry and Ilse Harmacinski just recently got their beautiful Gipsy Moth back in the air after some major refurbishment.

We love to hear from our customers, especially when they pass on testimonials:  Larry wrote,

"Terry,  thanks again for saving the day and helping us get the Moth back in the air in time for summer. We would have missed the season without all your extra efforts.Below is a short summary of our Moth, and Moths in general, use or discard as you see fit. My most favorite photo is of Ilse as we head into the sunrise.  Lucky shot!
Catch you around the patch sometime.
Cheers,  Larry & Ilse"

We enjoyed helping with FAA approval of the following alterations.
  • Hydraulic Disk Brakes and wheels by Grove Aircraft Landing Gear Systems, Inc. 

  •  Replacement Propeller under FAA rules for Owner Produced Parts.  Prop fabrication by Hercules Propellers.

  •  Gascolator by Steve's Aircraft.
 Larry also added, "The past 18 months Ilse and I dedicated ourselves to improving our example of The Moth, and upgraded the aging bladder brakes with Grove products, and replaced the low confidence vintage bale gascolator with one from Steve’s Gascolator. New windscreens, fresh mahogany panels, and some new paint were other added details, but of course some of these items need blessings from the FAA, and as most FSDO’s run in the opposite direction when seeking support with your antique biplane, after several false starts, my good friend said that I should call Terry Bowden at CAP. This was the best call I ever made, and as fast as I could accomplish the work and supply the supporting evidence, Terry came thru and I am very indebted to CAP for getting us airworthy in time for summer flying. While I have no plans at this time to fly the Moth to Australia, I do intend to share this delightful little ship with anyone interested, as it provides a glimpse into the past with all the sights and sounds of those interesting years when aviation was truly in it’s Golden Age. "
Maintain Airspeed, 
Larry Harmacinski

 They sent some more photos too...

For some reason, none of the photos show Larry doing any of the work!!  Whats up, Larry? Just kidding!  Ilse certainly does seem enthusiastic.  You guys make a great team!

What a beautiful job they've done!!