Bob Williams e-mail is [email protected]

This IS the Bob Williams that has the Lycoming engine conversion STC's, I have been speaking back and forth with him over the last few weeks, and recently purchased the O-360 conversion STC from him for my C175, he charges $1250 + shipping + bank fees for the STC paperwork package.

Brady wrote:Could someone provide me Williams email please? On here or via PM.

MBPilot88, Which STC did you buy for $1250?

I'm seeking out an STC for 180hp upgrade, and tailwheel conversion for C172H.

Happy flying!

Brady

I believe he charges $1250 for all of his STC's, I got SA807CE for the O-360 install on my 1956 172. I also inquired about his tailwheel conversion STC which is also $1250.

That's interesting, he quoted me like 4500 for the paper and mount, spinner and nose bowl. We'll see if he get around to me.

He told me he does not provide parts anymore, but that could just be because he doesn’t have them for my airframe. (Cessna 175). I just needed the paperwork, I have the parts.

I finally received my paperwork package from Mr. Williams today. It took exactly 60 days to receive after making the wire transfer.

I'm not posting this to complain, he did inform me from the start that it would not be a quick turn around.

I'm just putting the information out there so anyone else looking to purchase knows what to expect.

That is great to hear! I am still waiting for mine, Bob said I should have it within the next week or two, if that holds up it would have been 1 month turn time, pretty good compared to some others experience.

Fantastic! Thanks for the info.

It looks like I've successfully purchased two STCs from Bob too. Tailwheel and Engine STCs. Just awaiting confirmation right now.

Brady

I have the Avcon conversion in my P172D. My IA has had to deal with various issues with it over the last 15 years, so he's become somewhat of an expert at its nuances. He's slower than molasses in January at getting things done, but he's very knowledgeable. One point that he's made to me is that the STCs are specific to the different airframes by type certificate. In other words, the STC for my P172D, which is on the type certificate for the 175, T41A and B, 172XP, is not the same STC for a 172 or a 170.

One other thing: Williams didn't do any spin testing, so that although it probably makes no difference functionally, an aircraft modified with the Avcon conversion is prohibited from intentional spins. I'm not aware of any other changes from the stock limitations, however.

I've been pretty happy with my airplane with the conversion. I've flown other 172s with the same basic conversion, also, along with a plethora of stock 172s. It does improve performance significantly over stock, largely in short field and climb performance, with a tiny boost in cruise speed. For us lazy folks, the other benefit of a CS prop of being able to set rpm and just leave it there much of the time is nice, too.

Cary

MBpilot88A wrote:I finally received my paperwork package from Mr. Williams today. It took exactly 60 days to receive after making the wire transfer.

I'm not posting this to complain, he did inform me from the start that it would not be a quick turn around.

I'm just putting the information out there so anyone else looking to purchase knows what to expect.

Can I inquire if your package came with a parts list and instructions? Or just the STC paperwork? Also did it have the STC permission slip the FAA says you should have? I know this piece of paper doesn’t always come with STC’s (but should)...
Thanks,
Greg V

SquareHead wrote:

MBpilot88A wrote:I finally received my paperwork package from Mr. Williams today. It took exactly 60 days to receive after making the wire transfer.

I'm not posting this to complain, he did inform me from the start that it would not be a quick turn around.

I'm just putting the information out there so anyone else looking to purchase knows what to expect.

Can I inquire if your package came with a parts list and instructions? Or just the STC paperwork? Also did it have the STC permission slip the FAA says you should have? I know this piece of paper doesn’t always come with STC’s (but should)...
Thanks,
Greg V

Same as above, parts list and permission slip? How good are the plans?

I got the parts list, basic installation instructions, and blueprints.

As far as permission slip, all I got was a copy of the STC that is is stamped and assigned to my registration and serial number and signed by Bob. That is all I got from airglas and Del air for STC's purchased in the past couple months as well. I know some ASI's want a permission slip and I'm sure Bob would provide one if requested.

There are a lot of things in the prints that are very vague, for instance the fuel system modification blueprint is just a schematic and leaves much to the imagination. Luckily there is another a/c on the field that has an Avcon conversion and was done years ago with the full kit.

MBpilot88A wrote:I got the parts list, basic installation instructions, and blueprints.

As far as permission slip, all I got was a copy of the STC that is is stamped and assigned to my registration and serial number and signed by Bob. That is all I got from airglas and Del air for STC's purchased in the past couple months as well. I know some ASI's want a permission slip and I'm sure Bob would provide one if requested.

There are a lot of things in the prints that are very vague, for instance the fuel system modification blueprint is just a schematic and leaves much to the imagination. Luckily there is another a/c on the field that has an Avcon conversion and was done years ago with the full kit.

Good luck Matt, looking forward to seeing it when its done.

Kurt

MBpilot88A wrote:I got the parts list, basic installation instructions, and blueprints.

As far as permission slip, all I got was a copy of the STC that is is stamped and assigned to my registration and serial number and signed by Bob. That is all I got from airglas and Del air for STC's purchased in the past couple months as well. I know some ASI's want a permission slip and I'm sure Bob would provide one if requested.

There are a lot of things in the prints that are very vague, for instance the fuel system modification blueprint is just a schematic and leaves much to the imagination. Luckily there is another a/c on the field that has an Avcon conversion and was done years ago with the full kit.

A signed STC cover sheet with reg# is as good as a permission slip to me....that’s all a lot of STC holders provide. I’m thinking the FAA is good with it too.
I’m on the fence on which STC I am gonna go with....the cost of the Williams STC is inviting, but worried about how much sweat labor & headache vs. buying a complete kit from Del-Air. Doing all the math in my head (scary, I know) I’m coming up with a pretty close push either way....
Would like to hear more on the obstacles and clarity of prints/instructions....please share more
GV

SquareHead wrote:

MBpilot88A wrote:Would like to hear more on the obstacles and clarity of prints/instructions....please share more
GV

By far using the Williams STC is going to be the lowest cost route. My finished conversion cost me almolst exactly $20k, that’s including the overhauled O-360A1A (bought a run out core for a song and overhauled it myself) and some “upgrades” like a CGR-30P. I used a fixed pitch prop to keep costs down and got a few thousand bucks for my run out GO-300 to help offset the expense of the conversion. I finished the conversion about 2 months ago using copies of the drawings while waiting for my package to arrive from Bob to make it legitimate, still waiting but told it will be here any day........not holding my breath.

The obstacles were all pretty easily navigated with a little ingenuity and common sense, obviously keep a copy of 43.13 handy. You are not going to get some parts that are called out in the parts list, things like some of the sheet metal and rotable parts are no longer produced or available. Use acceptable alternates (think fuel pump, voltage regulator) or make the parts (baffling/sheet metal) in this case. For me the only “must source” part was the engine mount, which I got off a previously converted plane that was being parted out. I got the air box from that aircraft as well but ended up with a basically new one as it needed a lot of repairs, while making the repairs I tweaked it a little bit to fit the cowl opening perfectly. The exhaust hole relocation was a bit of a challenge as if I followed the dimensions and directions on the drawings it would have been a bit off, so I installed the exhaust, then used a PLS laser level to locate the hole on the compound curve of the cowling perfectly.

Doing the math with any other STC that I have found I was coming up with almolst $40k minimum, and again that is doing 100% of the labor myself so if you can find a mount and have an IA willing to use common sense the Williams STC can be done for literally half the cost.

That's exactly what I'm trying to do... Get the work done while Im waiting. I need the 150/150 conversion for this guy.

So I was able to track down one so far with the williams/bush stc.... Here it is. He has the dynafocal mount thogh so the plans won't be right for my application. Can you guys help me find more of these examples? I swear it might as well be a unicorn!

I've tried the phone number and get a voice mail message. Also emailed the address he gave on the voice mail. This was last Monday. I called again yesterday. Have not heard from him

I have been unable to talk to Bob Williams. All I need for my C-175 with a Lycoming Avcon conversion, is a part number for a support bracket or clamp or whatever that supports the constant speed prop control cable

Can you provide a part # or a photo for the part my C-175 Avcon conversion is missing? It's a bracket or sleeve or clamp or something like that that supports the constant speed control cable see photo