Hollmann HA-2M Sportster

[ironcowboy]

Here are photos of the bell cranks on a mock up shaft. These bell cranks are part of the interface between the control sticks and the pushrods that operate the rotor head. They mount under the pilot and passenger seats and the pushrods run up behind the firewall outside the cabin enclosure. The real shaft will be about 21.75 inches long, and then it gets welded. I have about two more mornings worth cutting pipe and will be ready for welding… Yes! 109F this afternoon in the shop, its beer o’clock!

 

[ironcowboy]

 

[ironcowboy]

 

[ironcowboy]

 

[Caribean_gyro]

suggestion on the tubes that will be hidden from inspection or by a pod. I sued LP3 corrosion block. I use a bit of acetone or mineral spirit to dilute it. fill part of the alum or chrome molly tube. plug one side and shake the lp3 oli around. . This will give you a crrosion block inside the tubes we never check.

Now if you are going to chrome or anodize anything, do this process after the chrome. the plating shop will get a contamined tank when they clean strip the parts prior plating.

Once it dries it feels hard and dry. looks as a varnish coat.

chuckp

 

[okikuma]

Looking good Cort!

The gentleman you mentioned that posseses the Ken Brock tooling I believe is Rodger Farnes. Somewhere, I have a picture of that two stroke 6 cylinder radial engine with Mac cylinders that Rodger brought to display at El Mirage one year. As soon as I find it, I'll download it to this forum.

Wayne

 

[ironcowboy]

Anyone know where to get corrosion block LP-3? I was using straight linseed oil to coat the inside of all steel pipes, but I was not too sure about the residual ability of that oil. Linseed oil is what Mr Holloman used, but well…corrosion inhibitors have come a long way since 1975. IS LP-3 a trade name? Is it a grease, oil, spray? Thanks for any info about it.

On a positive note, my aluminum bar stock has arrived, so I can begin cabin enclosure/windshield framing… Hea!

 

[Caribean_gyro]

aircrfat spruce

aircrfat spruce

aircraft spruce hast it. remember lp3 is corrosion block and dry hard as varnish. LP2 is a lubricant that wont dry out.

some person use Corrosion X as lubricant . But I use it in a Yak55 engine and it seems is conductive. Becasue I lost all the spark. I had to wash the engine again with mineral spirit and let it dry.

 

[ironcowboy]

Thank you CG,

Good to know that Corrosion X is conductive… that seems counterproductive to corrosion control… Corrosion requires an agent to act as an electrolyte or conductor, such as but not limited to: sea salt spray, road salt agents and good old fashioned water and dirt or grime. If a “corrosion preventative” facilitates the movement of metal ions, that is not ideal. Especially where the electrolytic material is in a continuous layer over different types of metal, as this can aggravate dissimilar metal corrosion, uniform etch and pitting.

I will get me so lp3.

Thanks for the advise

 

[ironcowboy]

Well today I finished the last fabrication required before welding of the pilot and passenger control stick system, or the steel parts anyway… I need to bend and heli-arch a couple of aluminum parts.

I will begin work on the cabin enclosure this week, and this is something that I can take photos of…

 

[ironcowboy]

Aft cabin roof support is installed.

 

[ironcowboy]

The stringers that comprise the cabin windshield are 2024 structural aluminum. 1.25 x 0.65

The plans have a 1/1 drawing of the correct radius bend to make at all enclosure points. The radius is the same at all points. I took a piece of ¾ plywood and traced out the radius and cut it out, to give me a good usable gauge as I formed my bends in the stringers.

 

[ironcowboy]

Using a Costco radius forming machine (foot stool with 1/2" dia pipe knee guard seen below) I have in my shop, I slowly began to bend the radius and constantly checked against my wood template and 1/1 drawing.

 

[ironcowboy]

At last, my radius were correct and the holes marked, drilled and secured into position. The aft cabin roof is a 3 part assembly, as you can tell. the center angle, and left and right formed stringers All the remaining horizontal stringers are 1 part assembles

 

[ironcowboy]

The technique for forming the one part assembly is similar; however, the trick is to know exactly where to begin your second bend so as to have a perfectly symmetrical product once finished that is the exact correct lenght and width.

I measured the exact width of the cabin, and then took a long stringer and formed one end to the correct radius. I placed this on my bench and traced it onto the wood stopping at ½ of the width I needed. I flipped my stringer over and traced the other ½ onto the table, and wholla…

 

[ironcowboy]

The top two stringers are now installed…

Tomorrow, I hope to form and install the remaining horizontal stringers

The original design for these stringers was to use Plexiglas as the windshield. I will NOT be using plexy glass, but instead using Lexan, in one large sheet slowly and lovingly formed, cut and clamped into place. Lexan is FAR superior to plexy glass, and I should be able to smack a goose with no real damage. I may cut out small spacer tabs 0.65 or 0.13 thick as required, to shim as needed between the stringers and the windshield at bolt locations. I’ll play this by ear as I begin to lay the Lexan into position, probably next month.

I would like to use graphite composite in place of all fiber glass fairings, MUCH lighter… does anyone know a good book for learning composite building?

 

[scottessex]

Cortland, nice progress.
were you ever at Pope AFB?
I was a C-130 crew chief at Hickam HI 85-87
And Pope NC from 87-91.

 

[Gyro_Kai]

Looking great. You are progressing fast. Now you can just recognize the characteristic shape.

Kai

 

[PalmPilot]

Hey Cort, "Awesome job"!... Kinda reminds me of a Hiller UH12B model, nice!... BTW, I have a costco machine too, works great as a balancer also...

Mike

 

[ironcowboy]

As you can see, the cabin enclosure is starting to come together.

Yes, now it’s looking like a real HA-2M Hamster

Palm Pilot, I like your signature line… I combined Cyclic and Joystick… I call my control mechanism a cycostick. It’s pronounced as psycho-stick…

Sorry Scott, I was not in the C-130 world until just after 9-11 and only went to POPE to throw men out the back of my airplane. You know when I was a kid my dad would back-hand in the seat for tossing trash out the window of the car as we whizzed down the interstate… Then when I joined the USAF C-130 world, the government paid me to toss stuff out the back of a moving airplane.

I gotta tell you this story real quick. The C-130 and the maintenance man are like a marriage. The mechanic lovingly cares for her, and puts so much time an effort into keeping her in tip-top shape. He is dedicated to her, and spends countless hours with her getting her just right. She is beautiful and he is dedicated and faithful.

Then, at sun down, we aircrew boys show up, swipe the logbook, check her out real close, and we really like what we see… man is she smooth! We stuff her so full of cargo, she wants to bust open at the seams. We take her for a ride, a looooong ride. We bang, jostle and pound the holly hell out of her all night long. We make her perform like she was made to perform, and push her right to her limits, actually a little over her limits… to the point we break something down there on her insides. She limps back home with us, and we dump her hot tired broken chassis on the driveway. We give each other high-5’s, and laugh and go huah huah huah, and chest bumps as we re-live last nights grand adventures. We point out ALL of her flaws to the poor maintenance man.

As we walk away, I look over my shoulder, and I think I see a tear drop on his cheek in the morning sun light. Oh never mind him, look at my C-130, she is gorgeous, really hot! I blow her a kiss, and I whisper a thank you to her, and tell her how much fun I had last night. See you again tomorrow night my love I say… The mechanic takes a few hours to forgive her; but then, once again he begins his nurturing and loving, cleaning her up, and fixing her wounds and bruises. He really really cares for her… but I’ll be back tomorrow night, and she will leave him once again to party all night long with the boys.

This is why USAF mechanics hate pilots and aircrew… He really loves his C-130, and can’t understand why she always seems to stray… The C-130 is a really bad girl, and us aircrew boys know it