$25 via Paypal - Need a Tail Strobe PS Picture

[testwest]

Hi everyone

I need pictures of the installation of a Hoskins single power supply for the tail strobe of a later model M20J....this would be one with the swept wing tips but no trailing edge wing tip white lights. The more detailed and hi-definition the better. I think the supply mounts on or near an aft tail inspection panel. I'll send $25 via Paypal to the first person that can email me enough photos so I can duplicate the install on our 1977 M20J.

Please, no shots of a Whelen A413 or HDACF in the avionics/battery bay, or pictures of your strobe on the rudder, thanks!

[201er]

[testwest]

No $25 for you!! But I'll buy a round somewhere just 'cause you made me laugh.

Anyone else? $25 is 1/4 of an aviation cheezboyger.........

[testwest]

Bumping this, any takers out there???

[FlyDave]

Norman,

I have a 1982 M20J so I'm not sure if this is the "later model" you're looking for. I does meet all the criteria you listed.

I'll take a couple of pictures today and post them. I believe it's on the left side tail inspection cover.

 

[testwest]

Outstanding!!! If you feel like taking off that cover and showing the install details too that would be AWESOME!

Right now it looks like we will have Whelen power supplies flashing Hoskins tubes in the wings, and a Hoskins supply running a Whelen strobe in the tail. Definitely not a purebred dog here.

[FlyDave]

Norman,

I just emailed 10 pictures to you: panel it's mounted to in place and panel removed and with PS exposed.

Let me know if they provide what you're looking for.

P.S. Don't send any money. Just post pics of your airplane.

[FlyDave]

Norman,

I just realized that the PS I sent pictures of is a BF Goodrich - not Hoskins. Not sure if this makes a difference (do you already have the hoskins and is a different format?)

[testwest]

Dave, got those pictures, you are the BOMB!!!!!

I can now duplicate the tail strobe install used for Mooneys from s/n 764 thru 942 or so, the electrical information is on the wiring diagrams in the Service Manual and the pictures will allow a physical duplication of the installation. Thanks! Drinks on me when we meet, I'll be at Edwards AFB in a couple weeks, you are at El Monte, right?

BTW, the BFG and Hoskins are identical, looks like Goodrich took over the manufacturing from Hoskins/Symbolic Displays for awhile there.

[jetdriven]

Norn, what is it you are doing? It sounds like a good idea, I can pay you the 12.50$ for half the idea?

 

[FlyDave]

Quote: testwest

Dave, got those pictures, you are the BOMB!!!!!

I can now duplicate the tail strobe install used for Mooneys from s/n 764 thru 942 or so, the electrical information is on the wiring diagrams in the Service Manual and the pictures will allow a physical duplication of the installation. Thanks! Drinks on me when we meet, I'll be at Edwards AFB in a couple weeks, you are at El Monte, right?

BTW, the BFG and Hoskins are identical, looks like Goodrich took over the manufacturing from Hoskins/Symbolic Displays for awhile there.

[testwest]

So, for jetdriven, ya can't give me anything for this, it is my pleasure to share the information!!!!

We have a very early M20J, s/n 24-0042 to be exact. We have been upgrading this airplane extensively to reflect later improvements and gain efficiency. One of the upgrades was the retrofit of the streamlined wingtips found on M20s after s/n 764...these have the nav and strobes in the tip, but they do not have the forward recognition light (they are pretty problematic, search this forum and you will find lots of info). They also do not have the trailing position light in the tip, either.

These tips duplicate the factory install exactly, that also involves changing the outboard aileron rib, the counterweight and the outboard wing skin.

Once this is done, however, the spherical coverage of the wing tip strobes no longer meets the FAA requirement for anti-collision lighting in the aft quadrant, since the strobes are buried in the tips under plexiglass. Therefore, the tail light in the rudder must be upgraded to a tail/strobe.

Here is where it gets interesting. Many M20Js have upgraded some components of their strobe lights. The original Hoskins power supplies for the wing tip strobes are also mounted in the wings, near the tip on an inspection plate. I am pretty sure those supplies are not easily or economically repairable. Whelen makes a replacement power supply, but the wires have to be changed in the connector going to the Hoskins flash tube. Approved data here: http://www.whelen.com/install/137/13706.pdf

So this is what we have on 201JX. One of the Hoskins power supplies failed back around 1990 or so. Both wing power supplies were changed for Whelen double-flash A490s. I know this because the wingtip light is a Hoskins (the fairing between the nav light and the strobe light has a little bump for the flash tube base, and on a Whelen light the fairing is smooth)...but the strobes go FLASHflash, which indicates a Whelen DF power supply. AFAIK, no Hoskins power supplies have multiple flashing capability. Of course it would have been nice to simply read this in the logbook, but........

We have a good Hoskins power supply...and we have a good Whelen A500 tail position/strobe to replace the Grimes position light on the rudder. I knew later configurations of the J had the Hoskins tail power supply mounted somewhere, this information came from looking at the wiring diagrams. But the actual physical mounting was not well documented on paper, which is why I needed the pictures!

BTW, the same 7.5 amp switch/circuit breaker is used for both the two and three power supply configurations. One additional 18 gauge wire goes from the switch to the lower fuselage wiring connector, pin 16 to be exact. Then, an 18 gauge shielded wire (with the shield open at the forward end and grounded back near the supply at the tail) goes to the power supply. If we had 3 Hoskins supplies, I would also hook all three yellow synch wires up and have synched strobes. But, we will have the two wings going FLASHflash, each on his own drummer, and the tail going flash-flash-flash, at some other frequency.

It will provide anti collision protection, for sure. No one with a sense of rhythm will want to be anywhere close.

 

[jetdriven]

Norm,

thats about what we have, although you are having me start to doubt if it is a Hoskins nav unit on the left wing.  We have a Whelen A640 light on the right wingtip and a comet flash (3x) strobe power supply.  The left wing has a ?? hoskins single flash.   It's annoying.  Not 600$ to change it annoying, but annoying.

 

Does the belly strobe light satisfy the regs for anti-collision protection?  Or did you do like Cirrus and not have one?

 

picture of mystery left strobe/nav. Is this a Hoskins?  Can I upgrade both power supplies to Whelen's with the sync wire?

[testwest]

Most definitely a Hoskins strobe there. The two screws and the "bumpy" fairing around the strobe tube base are the giveaway. A Whelen tip assembly looks like the attached picture. Note there is only one screw holding the fairing in place, in the center.

Unfortunately, the A490 Whelen power supply that replaces the Hoskins power supply can't be synchronized with another.

Not true, Normy! The Whelen A490ATSC power supply has a synchronization capability.

See here. http://www.whelen.com/_AVIATION/catalog/Power%20Supplies.pdf

These are about $298 from Aircraft Spruce. Watch your power loading, though, these are 4 amps each, you put three of them on the stock 7.5 switch/cb and it will break (as in un-make) the connection.

If you have a J earlier than 24-0764, you do not have the synch wire install and would have to fish a wire thru the wings to match the wiring diagram #800330 E2, which applied to s/n 764-900.

We don't have a rotating beacon, only the tip strobes...and the tail strobe is being installed.

[jetdriven]

OK I got one of each then.  Kinda screwy, but hey, they can't see both wingtips at the same time, usually.