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  1. #26
    proptop's Avatar
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    RE: What is an OPS motor?

    Yep!
    < Wrongway Feldman's Kreider-Reisner KR-21...(on Gilligan's Island)

  2. #27

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    RE: What is an OPS motor?

    ORIGINAL: Julian537

    How does the Rossi 65-81 DF motor and the BB rossi 90 Aero DF motor compare, if they compare at all?
    So here are some Rossi speed and DF engines to complete the list. All are discontinued now.

    Rossi .15 speed
    This has been the very successful “prototype design” for many later 2.5 cc C/L speed engines from other manufacturers. Both pipe timed and non-pipe timed available at that time. A legend for over 30 years.
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  3. #28

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    RE: What is an OPS motor?

    Rossi .40 FAI pylon
    Not until as Mr. Ranjit Phelan has upgraded this Rossi (AAC + improved intake assembly + special head) in the 90s it eventually became a strong competitor to the Nelson .40 FAI and IR .40 FAI. This of course was the pre-MB .40 PROFI engine era.
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  4. #29

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    RE: What is an OPS motor?

    Rossi .53 fan
    Offers better ducted fan performance (with Turbax, Thorjet e.g.) than the long-time discontinued OS .46 VR-DF. But I personally would prefer the OS .46 VX-DF which features a great carb.
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  5. #30

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    RE: What is an OPS motor?

    Rossi .61 Speed
    This powerhouse should be as strong as the PICCO .60 speed engine. Compared to the 5 port OPS 60 VAE the ROSSI .61 or .65 (both 3 and 5 port) runs not as smooth and seems to be slightly inferior powerwise. Also hard to find nowadays in new condition.
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  6. #31

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    RE: What is an OPS motor?

    Rossi .81 Fan
    The Rossi .81 unfortunately is badly balanced. The crankshaft counterweight is too light to compensate for the relatively heavy .80 sized piston, because Rossi simply used their basic .65 crank layout for the 13 cc engine. For that the ROSSI .81 DF running characteristics are rather rough at about 20000 rpm.
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  7. #32

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    RE: What is an OPS motor?

    Rossi .90 DF (later 5-port version)
    See next posts
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  8. #33

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    RE: What is an OPS motor?

    ROSSI .105 DF
    I believe this “heavy block” engine is way overrated at factory claimed 28000 rpm. 21000 maximum are more realistic IMHO. This should be a nice “torquer”. Good for bigger fans (Hurricane e.g.) and ample static thrust. Though again a painful carb.
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  9. #34

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    RE: What is an OPS motor?

    ORIGINAL: proptop

    How does the BVM .91R compare (power and weight wise ) to the above engines? It's made by Nelson, right?
    OK, so let’s compare several .90 DF engines:


    BVM .91R
    The BVM .91, which was released in the mid 90s, is the newest .90 ducted fan design of all ever available. The BVM .91 and the BVM .96.engines by Nelson thus do feature several „internal goodies“ the OPS, PICCO and ROSSI engines are missing (including OS .91 VR-DF and K&B). So only the BVM .91R is capable of rpms over 25000 in flight.
    But: Directly compared to the other .90 sized ducted fan engines the BVM .91R by no means is „torquey“. It is more a pure „runner“.


    PICCO P90 DF
    Except for the mediocre Picco P90 R/C carb (which should be replaced by a good OS carb)
    the only severe downside of the PICCO P90 is the stock conrod being too weak to reliably last about 50 runs. For that people liked to purchase the super sturdy RPM rods (aftermarket) in the past. However this engine is exceptional strong. It pulls the Ramtec fan better than any other engine.


    ROSSI 90 DF
    The ROSSI .90 ducted fan was the second winner in the class 10 to 15 cc during the last German Speed Cup (2006) and was only 4 kph „slower“ than the first placed BVM .91. The ROSSI 90 carb is a pain compared to the OS 9B carb for example. Other than that the Rossi 90DF is a powerbrute as well. I would say slightly weaker than the PICCO P90.


    OS .91 VR-DF
    This engine is quite easy to handle. Super carb. Forgives a lean run or two. The only downside are the too small head screws and exhaust adapter screws. By exchanging these stock screws with high steel grade ones you can eliminate this problem. Very torquey engine.



    Engine weight in this .90 class generally is of no importance for straight line speed competition. Bad throttling carbs such like the ROSSI also are of less importance here since nobody intends to throttle. Important: A R/C mixture control for 90 sized DF engines is mandatory to avoid lean runs (busting the cylinder/piston assembly). At a given (maybe too) limited cooling area of housing and cylinder head these 15 cc engines run considerably hotter than 10 cc engines.


  10. #35
    proptop's Avatar
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    RE: What is an OPS motor?

    Fan-Tastic photographs and information!
    Thank you
    < Wrongway Feldman's Kreider-Reisner KR-21...(on Gilligan's Island)

  11. #36
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    RE: What is an OPS motor?

    ORIGINAL: I-Love-Jets
    Yes, PICCO made a bunch of aero speed and ducted fan engines in the 80s and the beginning of the 90s. After that era, these well made engines sadly discontinued.

    I’ve added only the high performance types, although Picco also made some FIRE and FISE sport (pattern) engines.
    I bought the .40 FISE sport engine when it first appeared - heck when was that, maybe mid 80's? The guy at the store told me "oh man, it's the strongest .40 I've ever seen, turns a 10-6 about 16 grand". Uh no, it did not turn a 10-6 that fast [I don't listen to sales people at LHS's anymore either]. But it was a reasonably strong motor and ran pretty well. Also, the muffler was pretty restictive and the welded joint between the muffler can and adapter was prone to failure. Still have it, though I must clean it up after digging it out of the dirt a while ago.. hey, that reminds me of another "that's not good" incidient..

    MJD
    Sorry I'm late dear, I had to help my uncle Jack off his horse.

    Revver Bro #231

  12. #37

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    RE: What is an OPS motor?

    Has anybody tried converting any of the current hot marine engines? some have crankcases that would allow turning the exhaust towards the back. a head would be a simple build, since watercooling might be a bit heavy, or you could fuel cool the thing. for limited runs.

    by the way Thanks much I love jets that was very informative!

  13. #38
    Rudeboy's Avatar
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    RE: What is an OPS motor?

    I have been thinking about the OPS .80 for a conversion... looks possible. Finding or making a decent integral spinner is probably the hard part...
    Revver Brother #33
    ...I think it needs more power...

  14. #39

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    RE: What is an OPS motor?

    Great Info ! I love Jets.
    Thank you for the pictures and your posts.

    once again Great info!

    Julian

  15. #40

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    RE: What is an OPS motor?

    In the case of a byron Mig 15, what engine would you recommend?
    P80
    YS.60 old but strong and it can scream.
    OS.90

    These I have.
    Or is there something else.?
    Dollars count but will not rule the situation,,,Power and RPM's make the MIG move.
    Thanks in advance for your input,
    Bob

  16. #41

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    RE: What is an OPS motor?

    The old OPS .40 was a good all around sport engine
    but mine got a boat sleeve ( 190 deg. ) and nitro pipe.
    I found out that it also needed an RPM rod.[]
    Ralph

  17. #42
    Crazy4Flight's Avatar
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    RE: What is an OPS motor?

    about the same proportion and location of a Quickie 500

  18. #43
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    RE: What is an OPS motor?

    ORIGINAL: mylamo

    The old OPS .40 was a good all around sport engine
    but mine got a boat sleeve ( 190 deg. ) and nitro pipe.
    I found out that it also needed an RPM rod.[]
    Ralph

    That's a hard way to find out... but it's the best way... You probably won't make that mistake twice...

    As for the Mig 15 three posts up: turbines are getting rather cheap these days: anything designed around a .90 size fan engine will do very well a on Wren 54 or even a 44 if you want scale flight performance.
    I love the sound of a high strung two stroke, but for a jet, it just doesn't work...
    Revver Brother #33
    ...I think it needs more power...

  19. #44

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    RE: What is an OPS motor?

    Thanks for the scoop on the wren 54-44 I'll check into it I am 0 knowledge onn turbines.

    For now I want to be nostalgic and build it with a two stroke just to do it right this time.
    what are your thoughts on appropriate two stroke..

  20. #45

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    RE: What is an OPS motor?

    Hi!
    The Nelson engine is a more modern engine and thus outperform all OPS and Picko engines.
    Jan Karlsson - Supplier MVVS Products

  21. #46
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    RE: What is an OPS motor?

    Did you all notice the size and location of the aileron on those things?
    Doesn't take much surface area to control a plane at 200+

  22. #47

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    RE: What is an OPS motor?

    .
    Hindsight is an exact science.

  23. #48

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    RE: What is an OPS motor?

    sorry to bring this one up, but since all the OPS related info is posted here, why start a new thread right?
    anyways,
    i'm looking into the purchase of the OPS .60 Super SPP VAE that is pictured below.
    i know it is timed for running pipe and small high pitched props, but for our purpose (Free Flight competition)..........does anyone know if it would be capable of turning 11.5" x 4" CF props at around 20,000rpm?
    AMA 70865
    Team Satellite

  24. #49

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    RE: What is an OPS motor?

    That engine is meant to turn at much higher RPM than 20K. These engines are inefficient for anything flying under 180 mph, even better used on a ship well over 200. An 11.5 X 4 prop, if it could turn where the engine makes power, would have it's tips supersonic. Very bad efficiency, noise and could shred even a carbon prop from centrifugal forces on a 11.4 diameter prop with a shallow pitch.

    Wrong tool (engine) for the job.
    Oooh eee oooh ah ah(the crowd) ting tang walla walla bing bang!(the plane crash)

  25. #50

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    RE: What is an OPS motor?

    ORIGINAL: freakingfast

    That engine is meant to turn at much higher RPM than 20K. These engines are inefficient for anything flying under 180 mph, even better used on a ship well over 200. An 11.4 X 4 prop, if it could turn where the engine makes power, would have it's tips supersonic. Very bad efficiency, noise and could shred even a carbon prop from centrifugal forces on a 11.4 diameter prop with a shallow pitch.

    Wrong tool (engine) for the job.
    hmmmm, i guess the whole Free Flight community should have you there....we run 40's with 10x4's at over 23,500...............duh so you really didn't answer the question at all.....just speculation..............[:-]
    a simple answer is all that is needed, but if you have no clue, then please leave speculation out of the subject....thx
    picture below was with older rossi .65 swinging 12x4 at 19,500............guess we didn't know better then too
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    AMA 70865
    Team Satellite


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