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Author Topic: I need the mounting bolt pattern for an OS .40/.46VF...HELP!  (Read 655 times)

Offline Steve Helmick

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I need the mounting bolt pattern for an OS .40/.46VF...HELP!
« on: January 04, 2023, 05:53:37 PM »
I bought a used VF case with butchered mounting holes. I'm about to get them welded shut, and will file flat, glass bead the case, and then drill the mounting lugs to the correct location on a Bridgeport mill.

Have recently seen a drawing posted on SH that was an official OS data sheet. Can't recall which OS engine it was for, but pretty sure it wasn't a VF. I went to the OS factory website, but can't find any way to get to anything about the VF engines. Can somebody please help?   ??? Steve
"The United States has become a place where professional athletes and entertainers are mistaken for people of importance." - Robert Heinlein

In 1944 18-20 year old's stormed beaches, and parachuted behind enemy lines to almost certain death.  In 2015 18-20 year old's need safe zones so people don't hurt their feelings.

Offline Howard Rush

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Re: I need the mounting bolt pattern for an OS .40/.46VF...HELP!
« Reply #1 on: January 04, 2023, 06:18:26 PM »
I could take a VF to next week’s club meeting for your measurement pleasure.
The Jive Combat Team
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Offline Air Ministry .

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Re: I need the mounting bolt pattern for an OS .40/.46VF...HELP!
« Reply #2 on: January 04, 2023, 06:23:43 PM »
Same a a SF I think ! .  VD~

this'd be same or bigger . http://sceptreflight.com/Model%20Engine%20Tests/OS%20Max%2050%20FSR-H.html



17.5 x 44 . the VFR M has to be the SAME ! .  http://sceptreflight.com/Model%20Engine%20Tests/OS%20Max%2046%20VRM.html



#@!*^ pitchers ! All the elicoptor ones were std elicopter ones , like enya , ST , OS , Webra , by 1980 ?

So theres a degree of standardiseation , across one range , at least . the VF is the 16 mm shaft & maybe bigger'n a FSR 40/45 , so
if a print of the 50 gets the 17.5 x 44 for the holes , the case width should match too .  >:(


Offline Air Ministry .

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Re: I need the mounting bolt pattern for an OS .40/.46VF...HELP!
« Reply #3 on: January 04, 2023, 06:32:39 PM »
Bloody Communists .



they nhavnt shot this guy yet . From the tasackstan ,



gotit in gog pic ' os max vf ' . wont put link .

O.S. The MAX-40VF and 46VF are high performance engines designed specifically for R/C models. They use a cordless scavenging and an exhaust port at the rear to make it easy to set up a muffler system, especially where the latter must be built into the fuselage. These engines have a specially designed ABC style piston/cylinder design. 16mm OD high strength alloy steel crankshaft to provide extra power and durability and equipped with OS type 4D carburetor specially designed for good throttle response.

State-of-the-art precision equipment and carefully selected high quality materials are used in the manufacture of this engine to ensure consistent performance and long service life.

 

RUNNING-IN

       Special design piston/cylinder type ABC, two ball bearings, connecting rod with bronze bushings, etc. Allows this engine to be operated after a shorter break-in period. The pre-launch on the bench can be omitted. However, for long life and maximum performance, please follow the following procedure: Install the engine in your model and run it with a rich needle valve setting to keep it running at a fast "4-stroke" for the first two or three flights. Then adjust the needle valve to a slightly less rich mixture (i.e. at a reduced "2-stroke" speed) for the next four to six flights.

Fuel

        Use good quality commercial fuel or one of the fuels listed in the table. "A" is suitable for general use. If higher performance is required, fuel containing 10 to 20% nitromexane; (e.g. "B") can be used after break-in.

Lubricants can be castor or synthetic, provided they are always of the highest quality.

Blend A

Methanol 77%
Castor oil 23%
Nitromethane 0%
Blend B

Methanol 57%
Castor oil 23%
Nitromethane 20%
Candle GLOW PLUG

Since glow plug and fuel compatibility can have a significant impact on performance and reliability, it is suggested that the user select the R/C type plug that has proven to be the most suitable after testing. Recommended O.S. glow plugs no. 8 and no. 9.

Air propeller

Proposed propellers for flight according to the scheme are shown in the table. The suitability of the support depends on the size and weight of the model and the type of flight. Determine the optimum size and temperature after starting the engine. Check the propeller balance before installing it on the engine. Unbalanced propellers cause vibration and loss of power.

Wooden screws should be preferred. Some nylon propellers are not strong enough to handle the high power output of this motor and the throwing blade can be very dangerous.

MUFFLER

Because this engine was designed primarily for use with a tuned muffler system, a conventional muffler is not supplied. Any of the tuned mufflers currently available for 6.5cc engines. cm, can be used by inserting with silicone tube short length 17~18mm. aluminum tube between exhaust adapter (supplied with engine) and tuned muffler. The length of the intermediate pipe must first be determined according to the muffler setting instructions and then, if necessary, adjusted according to the support and fuel used after test flights. Generally speaking, the length of this intermediate tube should be between 6 cm (2.4") and 10 cm (4").

 


Offline Gordon Tarbell

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Re: I need the mounting bolt pattern for an OS .40/.46VF...HELP!
« Reply #4 on: January 04, 2023, 07:21:10 PM »
'That was not it oops!
Gordon Tarbell AMA 15019

Offline Gordon Tarbell

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Re: I need the mounting bolt pattern for an OS .40/.46VF...HELP!
« Reply #5 on: January 04, 2023, 07:36:34 PM »
For now  front to back 3.7mm dia. on 17.5mm centers ,   Left to right 44mm on center. Hope this helps until Eliott  can add the photo I sent him of my factory template.
Gordon Tarbell AMA 15019

Offline Gordon Tarbell

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Re: I need the mounting bolt pattern for an OS .40/.46VF...HELP!
« Reply #6 on: January 04, 2023, 07:40:00 PM »
I can send this to another cell phone but not smart enough to get it to stick on this forum. Send me a PM and I will give it a go.
Gordon Tarbell AMA 15019

Offline Steve Helmick

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Re: I need the mounting bolt pattern for an OS .40/.46VF...HELP!
« Reply #7 on: January 04, 2023, 07:49:40 PM »
Howard, thanks for your kind offer, but I have a .40VF case (resembles a crime scene), but I can't recall if the holes are butchered or not. If they are, I didn't do it. Maybe I'll look at it. I have some engines to assemble anyway, if the lights don't go out with this windy weather today.  H^^

Thanks, guys, and epsceptually Mathew. I now just need to figure out where the holes are from the faying surface of the main block, where the front housing bolts up. Obliviously, that'll be my refrance against the fixed jaw. Cirrusly, thanks, Matt!  VD~ Steve
"The United States has become a place where professional athletes and entertainers are mistaken for people of importance." - Robert Heinlein

In 1944 18-20 year old's stormed beaches, and parachuted behind enemy lines to almost certain death.  In 2015 18-20 year old's need safe zones so people don't hurt their feelings.

Offline BYU

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Re: I need the mounting bolt pattern for an OS .40/.46VF...HELP!
« Reply #8 on: January 04, 2023, 08:05:54 PM »
I can send this to another cell phone but not smart enough to get it to stick on this forum. Send me a PM and I will give it a go.

Offline Peter in Fairfax, VA

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Re: I need the mounting bolt pattern for an OS .40/.46VF...HELP!
« Reply #9 on: January 05, 2023, 02:46:32 PM »
How about a whole engine hole DB, in spreadsheet, with hole dia, front-back and right-left for every popular engine?  Width excluding lugs and rear extension length would "round that out." 

A person can dream...

Offline Air Ministry .

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Re: I need the mounting bolt pattern for an OS .40/.46VF...HELP!
« Reply #10 on: January 05, 2023, 09:53:01 PM »
In some such circumstances , The Best Bet , is to use a piece of string . Metaphorically speaking ! .  VD~ S?P

Get a ball pen ( that goes  >:( )n and youre steel rule dept.

Put one steel rule under lug against case thing , vertical . Push in till teady & run the pen along .

then put two steel rules , and put a second pen line along !

And a third . Using a diffeant colour helps if youre going to end up with to many  ;D

Or just use a 4.5 m.m. piece of steel . 3/16 in. even .  44 - 39 = 9 , / 2 = 4.5 .  :o And SCRIBE with a New knife Blade , then put pen in the cut .  VD~

RIGHT . Lengthways , Sit it on a flat firm thing , and get a rectangular block , an half or something , thick . SCRIBE , flip the case over ( from Fr down to r down 0 and Repeat ,
Youve got two lines , zacty in the middles the centre line . IF youve hung the exhaust over the edge .

flipping thicker spacer blocks gets others .

BEING along the lugs you can find the two ( Equal No. Out ) at 44 m.m.
          across the lugs you can pick in or out or find center & go out . or all three .  VD~

asin , if you had six scribe lines up , case nose down , and six scribe lines , case nose up , across the lugs ,

A THING with ' 17.5 m.m. marked on it , With a LINE half way in between , is gunna get you there , to pick ON or BETWEEN which scribe lines to center Punch .

Can b b be a b b barst . . with little bits of hard & soft weld and case to drill without it kicking . So your welders best to go hell for leather . weld the snot out of it , and Dress Back Later .
Hopefully thered be a remenant of the underside flat surface .

A heavy steel bar that EXACTLY fits through the case bore , case heated , ( a foot long  ) would hold the case concentricity whilst he welded the snot outta the lugs .
Would be a good base for re aligning the underface . Engineers blue & lapping in a 36 mm slot in a piece of steel , would be the pommy way to finish reface .

Alan e did a set of trident bearings with a scraper from .020 under , to stock , in two days , with a scraper & blue . so yours is simple .  ;D  LL~  %^@

As In dont spin out . the edges , top & F & R are technically irrelevant . bar facing holes top square . for a start anyway . a Virneers gunna be usefull . and unhurriedness .

ONCE a square flate base is establised on the underside , its a datum if you pull the reast in .
A motorcycle Case Lug fixer would be used to fixing lugs . de Oiling can be the grouse .

A Broken pig metal car door lock latch i told the guy John was unweldable - and looked across at the rural bike shop - wandered over - He was welding a Ag gas tank - Put it on the bench at his elbow .
wandered back and picked it up - He never blinked an eye , almost . The Moral Being , someone somewhers got it ' down pat ' . likely not the appretice . But some have been known to . Tech Shop at school ? .

Offline Air Ministry .

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Re: I need the mounting bolt pattern for an OS .40/.46VF...HELP!
« Reply #11 on: January 05, 2023, 10:00:19 PM »
44 = 1.73228 in.

17.5 mm = 0.6889764 in


o.k. so half space of 17.5 is  8.75 m.m. = 0.3445 inch , for & aft of center .

Might go for 2 m.m. pilot on NEW DRILL , did something the other day , id acidently picked up a TUGSTEN one , $ 8.95 ARGGHH .
in a rare mood of decadance I bought it , Was for driling a snapped SF 40 allen head bolts heads off . No worries , worth the dosh .
a H S one mighta baulked .

SOMETHING LIKE THAT , Anyway .  H^^ preciate the manners .

Offline Steve Helmick

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Re: I need the mounting bolt pattern for an OS .40/.46VF...HELP!
« Reply #12 on: January 10, 2023, 05:41:59 PM »
Fugedaboudit, Matt! I've got an appointment to have the TIG done by Jerry Day, RAM Racecar builder and Sprint Car Champion. If I'd knocked the lugs off, I'd make some fancy plugs and such, but Jerry has this handled.

Jerry was a NW Skyraider for awhile, learned the full pattern (on a TF Tutor/McCoy .35RH), built a very nice Profile Cardinal (.46LA), got it flying very well, and hung it on the wall of his shop for a conversation piece. He broke his back in a Vintage Sprint Car race maybe 10 years ago, and is in pretty rough shape, but still welds like an artist. Besides racecars, he makes hardware and welds propellers for Unlimited Hydros. I gather that welding and fabrication pays better than Stunt. y1 Steve

PS: The case has been soaking in cider for a week, in a coffee mug...actually lacquer thinner. Changed the lacquer thinner for fresh, just this morning. The coffee mug is the wife's, so mum's the word. 
"The United States has become a place where professional athletes and entertainers are mistaken for people of importance." - Robert Heinlein

In 1944 18-20 year old's stormed beaches, and parachuted behind enemy lines to almost certain death.  In 2015 18-20 year old's need safe zones so people don't hurt their feelings.

Offline Steve Helmick

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Re: I need the mounting bolt pattern for an OS .40/.46VF...HELP!
« Reply #13 on: January 10, 2023, 05:59:11 PM »
How about a whole engine hole DB, in spreadsheet, with hole dia, front-back and right-left for every popular engine?  Width excluding lugs and rear extension length would "round that out." 

A person can dream...

That database deal was attempted about 20-25 years ago. I think it may have been on somebody's website, but I'm pretty certain it went away after awhile. Tulsa GD's, maybe? Plus, you have to trust the measurements, which isn't always a good thing. That's why I was wanting the factory drawing for the .40/.46VF. "Trust no one, but verify" applies for this stuff.  H^^ Steve
"The United States has become a place where professional athletes and entertainers are mistaken for people of importance." - Robert Heinlein

In 1944 18-20 year old's stormed beaches, and parachuted behind enemy lines to almost certain death.  In 2015 18-20 year old's need safe zones so people don't hurt their feelings.

Offline Air Ministry .

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Re: I need the mounting bolt pattern for an OS .40/.46VF...HELP!
« Reply #14 on: January 10, 2023, 08:45:59 PM »
Quote
I gather that welding and fabrication pays better than Stunt.

Who was it that came up with this ' PRO STUNT ' stuff ?    :(

Offline Steve Helmick

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Re: I need the mounting bolt pattern for an OS .40/.46VF...HELP!
« Reply #15 on: January 11, 2023, 11:09:37 AM »
Who was it that came up with this ' PRO STUNT ' stuff ?    :(

Winfred Urtnowski, from what I understand. Probably at least a decade before I came back to controline. Back when Windy did the PAMPA newsletter, and maybe before it was officially called PAMPA. There were secrets back then. :X Steve
"The United States has become a place where professional athletes and entertainers are mistaken for people of importance." - Robert Heinlein

In 1944 18-20 year old's stormed beaches, and parachuted behind enemy lines to almost certain death.  In 2015 18-20 year old's need safe zones so people don't hurt their feelings.


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