RE: ASP FS400AR Radial Engine  
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RE: ASP FS400AR Radial Engine - 6/10/2008 9:48:59 PM   
Broken Wings



Posts: 464
Joined: 1/15/2003
From: Spaceport, FL, USA
Status: online 		Kmot, I've got some AerMet® 100 Alloy and a CNC Lathe. I could help you with the replacement pins.

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Regards,
John

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       Post #: 76

RE: ASP FS400AR Radial Engine - 6/10/2008 10:04:54 PM   
Kmot



Posts: 7710
Joined: 6/11/2003
From: Northridge, CA, USA
Status: offline 		yo, loser!

Here is what I did with my radial:

http://www.rcuniverse.com/forum/m_6767296/anchors_6767296/mpage_1/key_ASP%252CFS400AR%252Cradial/anchor/tm.htm#6767296

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Ahhh......screw it!

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       Post #: 77

RE: ASP FS400AR Radial Engine - 6/10/2008 10:12:53 PM   
Broken Wings



Posts: 464
Joined: 1/15/2003
From: Spaceport, FL, USA
Status: online 		Well Now, Don't I feel like an

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Regards,
John

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       Post #: 78

RE: ASP FS400AR Radial Engine - 6/10/2008 10:14:36 PM   
Kmot



Posts: 7710
Joined: 6/11/2003
From: Northridge, CA, USA
Status: offline 		LOL!!

Post #75, his user name is loser.

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Ahhh......screw it!

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       Post #: 79

RE: ASP FS400AR Radial Engine - 6/16/2008 10:46:04 PM   
Broken Wings



Posts: 464
Joined: 1/15/2003
From: Spaceport, FL, USA
Status: online 		I got the "Pin" in the mail today. I'll check it out on the scope and try and figure out whats up with it. I'm going to test the hardness as well.

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Regards,
John

(in reply to Kmot)
       Post #: 80

RE: ASP FS400AR Radial Engine - 6/17/2008 12:55:19 AM   
Lou Crane


 

Posts: 241
Joined: 5/11/2006
From: Sierra Vista, AZ, USA
Status: offline 		KMot,

I noticed you checking RPM at several stages. What RPM range did you see?

Noticed some oil (probably in the exhaust) on the lower crossbar of that MONGO test bench, and figured you were keeping things rich for initial running-in. Seemed confirmed when you wound it up just prior to shut-down - blew a lot of juice out the stacks, no?

Fascinating sound, and the camera mike was close enough to hear a lot of the mechanical sounds as well. Looked like it was rock-solid smooth, too.

Thanks for the sessions! Luck in the air with this wonder...

_____________________________

\BEST\LOU
Lou Crane, Sierra Vista, AZ

(in reply to Kmot)
       Post #: 81

RE: ASP FS400AR Radial Engine - 6/17/2008 2:24:23 AM   
Kmot



Posts: 7710
Joined: 6/11/2003
From: Northridge, CA, USA
Status: offline 		John, thanks for checking it out.

Lou, I was indeed running it rich. The RPM range during this testing was a low idle of 1600 and a high rev of 7400 on the Master Aiscrew 18x10 prop.

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       Post #: 82

RE: ASP FS400AR Radial Engine - 6/17/2008 7:47:23 PM   
Broken Wings



Posts: 464
Joined: 1/15/2003
From: Spaceport, FL, USA
Status: online 		I checked the hardness of the original pin and it measured 61 Rockwell “C” on one end and 64 Rockwell “C” on the broken/chipped end. Obviously the pins were too hard and didn’t have the necessary fracture strength required to put up with the side load.
To give you an idea of how hard they were Zirconia Ceramic measures 75 Rockwell “C”
Aermet 100 in its annealed state measures about 38 Rockwell “C” and when heat treated comes up to about 58.

As far as tool steels go Aermet is in a league of its own, it possesses a high hardness and strength combined with exceptional ductility and toughness. It is designed for components requiring high strength, high fracture toughness and exceptional resistance to stress, corrosion, cracking and fatigue.
You should be set…..

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Regards,
John

(in reply to Kmot)
       Post #: 83

RE: ASP FS400AR Radial Engine - 6/17/2008 10:02:25 PM   
Kmot



Posts: 7710
Joined: 6/11/2003
From: Northridge, CA, USA
Status: offline 		Rockwell 58, got it.

Thank you John!

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Ahhh......screw it!

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       Post #: 84

RE: ASP FS400AR Radial Engine - 6/17/2008 10:07:34 PM   
rdouglas


 

Posts: 15
Joined: 5/16/2008
From: Hanford, CA, USA
Status: offline 		I'm very impressed with this thread. Your level of detail is something I probably will only strive to achieve. One question tho, why is there one solid piston rod?

Thanks,

Randy D.

(in reply to Kmot)
       Post #: 85

RE: ASP FS400AR Radial Engine - 6/17/2008 10:32:23 PM   
Broken Wings



Posts: 464
Joined: 1/15/2003
From: Spaceport, FL, USA
Status: online
quote:

ORIGINAL: rdouglas

I'm very impressed with this thread. Your level of detail is something I probably will only strive to achieve. One question tho, why is there one solid piston rod?

Thanks,

Randy D.


That's the master rod. We can make those to.....

I run some old OS Max-H 80 size engines and they use a needle bearing in the big end of the connecting rod. I made a new one for one of my engines. You can see in the picture that the tool marks are different on one of the rods.
I added an additional piston ring groove so it has two piston rings. It sucks fuel so well now that it doesn't need muffler preassure to run. (in any attitude)

I use a CAM program called Mastercam, it generates the necessary machine code for the mill to cut out the parts. I "reverse engineer" the part (copy it) on Mastercam then pick out the tools I need to machine it. Make a tool list and load those tools into the machine. Set the part/block of material in the vice and mash the button........Out comes a part.
I made the rod from 7075 aluminum and used 544 leaded phosphor bronze for the bushing in the small end.

In a production "anything" the amount of detail/quality is limited. Kmot "blueprinted" his radial by disassembling everything and checking/making it correct. That's why it runs so great.

Boy, did I screw those pictures up....

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< Message edited by Broken Wings -- 6/17/2008 10:54:56 PM >

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John

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       Post #: 86

RE: ASP FS400AR Radial Engine - 6/18/2008 2:09:03 AM   
Kmot



Posts: 7710
Joined: 6/11/2003
From: Northridge, CA, USA
Status: offline 		That's why it "will run so great".

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Ahhh......screw it!

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       Post #: 87

RE: ASP FS400AR Radial Engine - 6/18/2008 2:27:42 AM   
Broken Wings



Posts: 464
Joined: 1/15/2003
From: Spaceport, FL, USA
Status: online 		It's a cool engine.

A little more compression, a cam with less lift, more duration for better cylinder fill. Heavy valve springs, gear driven fuel pump off the crank in the rear…..

A YS five cylinder radial....

Now that you've polished all the rocker covers, mount, etc. are you going to run one of those killer SOLO propellers?.... http://www.soloprops.com/


Dude....making a "Hot" cam for this thing would be soooooooooo easy......Smiles

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< Message edited by Broken Wings -- 6/18/2008 2:34:19 AM >

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Regards,
John

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       Post #: 88

RE: ASP FS400AR Radial Engine - 6/21/2008 7:47:40 PM   
Kmot



Posts: 7710
Joined: 6/11/2003
From: Northridge, CA, USA
Status: offline 		Look at these killer CNC linkpins Broken Wings made for my ASP FS400AR radial engine!

Thank you John!

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Ahhh......screw it!

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