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Thread: A Working Sperry SP-50
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07-10-2007, 11:28 AM #1
A Working Sperry SP-50
I just finished buttoning it up on the bench. I double and tripple checked every circuit connection before re-installing the chassis cover.
I was able to drill a 3/4" hole in the back of the chassis so the harness had a way out, and with the convoluted black wire tubing it fits very nicely.
24VDC power is applied here, and all of the electro-magnetically and solenoid operated switches are engaged. The disconnect will be controlled from the Boeing yoke using the switch for this purpose.
I was unable to get the pitch & roll control micro switches working. The circuit logic is too difficult to figure out and I didn't want to start snipping the original wiring off of them. I used a SPDT detector switch that I installed for the pitch control, and I'm not bothering with the roll control since I fly it in manual mode anyway and use the Heading Select function and turn it with the HSI bug.
I'm a happy camper today!
Boeing Skunk Works
Remember...140, 250, and REALLY FAST!
We don't need no stinkin' ETOPS!
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07-10-2007, 11:47 AM #2
Looks fantastic
One of these I'll have travel down to see this personally....
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07-10-2007, 12:13 PM #3
Hi Matt!
Yep, one of these days when I get all of this together. I have the SP-50 to install, finish the LCD display for the Sandel HSI, finish wiring all of the indicators for the MIP, on and on. You know how it goes.
I have so many things going on at once it doesn't seem like I'll finish any of them, but it slowly comes together a piece at a time.Boeing Skunk Works
Remember...140, 250, and REALLY FAST!
We don't need no stinkin' ETOPS!
Powered by FS9 & BOEING
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07-10-2007, 12:18 PM #4
- Join Date
- Oct 2005
- Location
- Holley, New York U.S.A.
- Posts
- 1,776
Yup.. You just keep swinging away at it and a little at a time it all comes to gether. I was in the middle of a flight the other night when it dawned on me.. Hey this thing really flies!! in a sim sort of way!
Bob Reed
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07-10-2007, 12:30 PM #5
I still haven't even re-installed the glareshield trim and the lighting from when I used the truck bed spray liner!
Something always seems to come up, but at least I'm glad I finished the SP-50 modifications.Boeing Skunk Works
Remember...140, 250, and REALLY FAST!
We don't need no stinkin' ETOPS!
Powered by FS9 & BOEING
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10-21-2015, 09:22 PM #6
- Join Date
- Jan 2012
- Location
- VA USA
- Posts
- 5
Re: A Working Sperry SP-50
I realize this is a very old thread but can anybody tell me where to connect the 24V for the solenoids to work?
Thank You
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10-23-2015, 01:05 AM #7
- Join Date
- Oct 2015
- Location
- Southern Ilinois
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- 3
Re: A Working Sperry SP-50
I am the OP of this thread. I haven't been here in a LONG time. My SP50 head is still installed in the center control stand and is wired. It's a PITA to pull because of the wiring so I can't tell you. Experimenting with a 24VDC power supply on the solenoid contacts will not damage anything.
I'll see if i can dig up some photos. STBY.
The new 727 after moving to my new home...
Still looking for the SP50 photos.
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10-23-2015, 01:20 AM #8
- Join Date
- Oct 2015
- Location
- Southern Ilinois
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- 3
Re: A Working Sperry SP-50
Boy are you in luck...sorry thay are not very clear or detailed, but they will get you started.
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10-23-2015, 01:29 AM #9
Re: A Working Sperry SP-50
I didn't realize what my user name was anymore until I saw this post. You can delete the Boeing Skunk works account if you like. I took a guess at my password because I use it for forum sites.
Boeing Skunk Works
Remember...140, 250, and REALLY FAST!
We don't need no stinkin' ETOPS!
Powered by FS9 & BOEING
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10-31-2015, 04:49 PM #10
- Join Date
- Jan 2012
- Location
- VA USA
- Posts
- 5
Re: A Working Sperry SP-50
Thanks
removed every wire and starting from scratch
studied the manual so I understand what solenoid (s) should trip under certain circumstances and the logic behind the switch sequence
drawing the schematic as I "plot" along
awaiting my arduino Teensy board and a opto-coupler relay board
Marc
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