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Old 11-28-2020, 02:26 AM
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I just had a couple of .125" band saw blades get hung up somewhere, I'm still watching for your package, Thanks

That battery you see there was real wimpy and only lasted about a year, it's now one of the handiest tools I have.

Pete, I side mounted the FA 30, that's why the little throttle servo I showed works so well. Since the throttle barrel doesn't move in and out the straight line approach works even better.
Yep, tyres and colours are spelled differently down your way.

PS Gary is a great packer.


Last edited by Hobbsy; 11-28-2020 at 02:34 AM. Reason: Add picture
Old 11-28-2020, 04:51 AM
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The beige and blue colour scheme would be used for it's "retro" look, well suited for a knock off of a retro plane With alll these years of Brit cars and motorcycles , words like "colour, tyres, petrol, bonnet, boot, bangers, spug bubble, gudgeon pin, spanner" etc become second nature. Living 15 miles north of the Canada border you get plenty of exposure as well.
Hope you don't mind Dave but I also slipped a Chinese "rev counter" (tachometer) in the box

Beige and blue "retro" color scheme. Toledo Special.
Old 11-28-2020, 06:03 AM
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I'll have to check my blues, I think they are darker and metallic looking. I always like to see and try new things, new to me anyway. Thanks
Old 11-28-2020, 08:32 AM
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I have about 80 or more of those batteries. They are great for working on planes. Some are loose, others are in cases that hold 10 each. When laminating large parts, lay them on wax or parchment and place the case on top. Comes out nice and flat. Worked great on the Rascal. The main spars are laminated 3 piece with epoxy, and took three cases to weigh them all down.

They also work great as ballast in the winter for my 2WD truck.
Old 11-28-2020, 11:32 AM
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Default Muffler

This is my first attempt at machining and building my own design muffler. I know there are some great machinist in this forum that have skills and knowledge way beyond what I have so I am very interested in any comments.

A little background. I’m a retired electrical engineer. After a couple of years of retirement, I realized I need more to do than RC modeling and ham radio. I got a part time job at a machine shop working a day and a half a week. This is great for me because I’m always learning new things. All of this is new to me. One day I approached the owner asking about where I could buy a used bench top lathe. His reply was “why would you want to do that when you have all this equipment here to use”. So, after doing some rough CAD drawings I came up with a simple muffler I wanted to try to make in this shop.

All of the machining except for the tapping was done on a MAZAK 10M CNC lathe. Even the wrench flats on the muffler were done on the lathe. I had help doing all this but it was a great learning experience. I had to do it around the existing live tools in the lathe not to disturb real production set up in the lathe. The programing to do the wrench flats and the holes for the exhaust were a bit of a challenge.

It took me an entire day to make the parts for 6 mufflers. All the main parts are aluminum. I bought all the aluminum stock from Amazon.

The part that screws onto the manifold was drilled and then bored to 11mm so I could tap it with a M12X1.0 tap. If I was to do it again, I would have cut the internal threads on the lathe. All of the side holes for the screws were drilled on the lathe but I tapped them by hand with a 4-40 tap. I also tapped the pressure nipple hole in the body of the muffler with a 10-32 tap.

The pressure nipple: Looking at the Tower site Dubro pressure nipples were about $4 each. I found similar nipples on eBay from a dental supply that were 10 for $3.88. I liked the price of those much better but I have no idea what a dental supply was selling them to be used for.

I wanted to have a small baffle inside the muffler. I used a washer for that on a long 4-40 screw.

My muffler weighs a little over an ounce more than the cast muffler that comes with the FA-91.

I tested the engine on the stand to get some same day numbers with the original muffler and my muffler. Mine is a little quieter with a deeper or lower tone. I wish I had something to measure the sound level. I consistently got 150 to 170 more RPM at the top end with my muffler on a FA-91. The low end was the same but that “poit poit” sound seemed to be more exaggerated with my muffler.

I am going to drill two of the manifold end parts larger. One will be tapped M14X1.0 and one tapped M15X1.0. When I build these two mufflers, I plan not to use the washer baffle on them. I need to buy the drills and the taps for that project.

I would appreciate any comments on what I could have done different. I have access to a shop that has 8 CNC lathes and one large CNC mill. The owner of the shop likes to tinker with different projects. Maybe I can talk him into producing FS mufflers.

Thanks for reading all of my ramblings.

Pedro
















Old 11-28-2020, 01:58 PM
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So are you taking orders yet?
Old 11-28-2020, 02:09 PM
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Once the machine is set up I can just keep feeding in stock and make parts. How many can I put you down for?
Old 11-28-2020, 05:57 PM
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Cool looking piece Pedro. Sweeeet
Old 11-28-2020, 06:34 PM
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Thanks Lonnie
Old 11-28-2020, 07:49 PM
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Nice job Pedro, A nice variation on the big block fire nozzle muffler style. I like the "poit-poit" burble sound too.
Old 11-28-2020, 08:11 PM
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Thanks Gary
By the way, 10 meters was open today to South America and I did hear a lot coming from Europe on 15 meters.
Old 11-29-2020, 03:05 AM
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Originally Posted by modeltronics
Thanks Lonnie
Good job on that muffler, I have one started and got side tracked with the Robin Hood 25. I have one each of the vehicles just inside you garage.

Gary, I found some of that soft blue colour at MacGregor's in the UK, so far I can't find the Off White. Horizon is getting a shipment of Ultracote in a few days.
.
Old 11-29-2020, 06:52 AM
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Thanks Dave
Old 11-29-2020, 10:01 AM
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As soon as I finish these last 10 or so sheets for the laser, I will get back to making the exhaust for the Corsair. First I need to align the 120R3 to the firewall. Supposed to have a 3/16" offset, so have to make some minor adjustments, shims for correct side thrust, and hope it all lines up so the cowl fits properly without any cutting, then I can go ahead and layout the pipes and get them made, as well as the nuts to secure them now that I have the die and stock for them. Somewhere I have a pipe bending tool, I just don't know where I put it.
Old 11-29-2020, 06:32 PM
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I hope my Saito Club friends had a warm and happy Thanksgiving.

although my family did not come together for the day because of the c-19 our spirits were high.

Jim
Old 11-29-2020, 08:13 PM
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Originally Posted by modeltronics
Thanks Gary
By the way, 10 meters was open today to South America and I did hear a lot coming from Europe on 15 meters.
Yes, heard South Africa on 15m 59. Been working TX, CA, Washington State, AZ daily on 20m. I often check in to the Salvation Army Net; 14.265 USB iirc.
DE KG8LB
Old 11-29-2020, 08:14 PM
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Thank you and back at you Jim! I have a son, a paramedic, who is in quarantine. He caught COVID from a patient. He is pretty sick but we are hoping he will recover soon.
Old 11-30-2020, 07:18 AM
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Mike, my prayers have already acsended for you and yours.

All, I hope you all had a wonderful Turkey Day. Much to give thanks for even in these times of trouble.

I have flying withdrawals. Between work and weather.....nothing for 3 weeks. I hate to mothball my planes this early, I'll keep a couple on the ready in case things shape up. Those that I need to hit with a speed gun anyway. I wish APC made a 14x9 and a 15x9, would be perfect for a lot of the faster 60 size WWII warbirds running Saitos.
Old 11-30-2020, 07:29 AM
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Originally Posted by Jesse Open
The beige and blue colour scheme would be used for it's "retro" look, well suited................clipped..............
Hope you don't mind Dave but I also slipped a Chinese "rev counter" (tachometer) in the box

Beige and blue "retro" color scheme. Toledo Special.
Good looking plane. Cowl still not painted? I have a few wooden "Round TUITs" I could send you.

Re chinese tachs. I love those things, makes tuning gasser engines much easier due to the wait time after each adjustment. There is one permanently mounted in my STM with the FG21.
Old 11-30-2020, 08:31 AM
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I know what you mean I'm chopping at the bit to get back on the Pink N Poke but the wife has been helping decorate for Christmas and straightening up after the holiday. I still need to clean the smoker before the next ice storm hits. My daughter in-law requested I smoke ribs so for her I did a rack and sent the leftovers home with her.
Old 11-30-2020, 08:36 AM
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Yeah, the brisket made a mess of mine too, but if my next use is just smoking, I can leave it since it is just like the commercial smokers, it has the nice gooey caramelization on the racks. I would have to crank it to 400 for 30 minutes to burn it off.
Old 11-30-2020, 08:37 AM
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I tried smoking a turkey once but couldn't figure out which end to light.
Old 11-30-2020, 08:39 AM
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Well, smoking that brisket kept me very busy keeping it lit.
Old 11-30-2020, 09:07 AM
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Originally Posted by Glowgeek
Good looking plane. Cowl still not painted? I have a few wooden "Round TUITs" I could send you.

Re chinese tachs. I love those things, makes tuning gasser engines much easier due to the wait time after each adjustment. There is one permanently mounted in my STM with the FG21.
Thanks Lonnie,

No intention to paint the cowl It was pieced together four times from three separate, busted up cowls. Not painting may save another repair.

I wasnt knocking el cheapo tachs from the land that manufactures deadly viral infections.
I tossed in a Brit term for "Tachometer" as we were bantering about such things at the time.
They do give numbers after all,

Last edited by Jesse Open; 11-30-2020 at 09:24 AM.
Old 11-30-2020, 09:46 AM
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As long as precision isn't needed, the chinacrap stuff works ok. That reminds me, now that Century Jet retracts are Kaputtin, I need to figure out how to make my own controller. The one for my Corsair is made up of parts from china. Never know when I might need a new one.

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