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  1. #5776

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    RE: Larger Revolver

    It's closer to 40oz if you compute it using the 22.5 lbs weight someone projected since GP is a bit conservative in their weight estimates. You would almost certainly hit that weight or higher if you need to add a canister muffler. By way of comparison the Extreme Flight Yak (88") has a wing loading of about 29oz and it is a highly capable 3D plane. The Revolver 90 will probably still float pretty well at that weight. It will still be more of a sport flyer like the R70.

  2. #5777

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    RE: Larger Revolver

    We are also dealing with scaling issues - wing loading is not constant across scale, but rather increases; a 40 size plane will have lighter wing loading than an otherwise identical 120 size plane. The metric that normalizes for scale is the cubic wing loading; i have a calculator, but have not yet plugged in the numbers. Having said that, by inspection, the R90 will have higher cubic wing loading than the 89" 3DHS or Eflight birds.

    And, i think most of us who may buy this plane will want at least a 60cc, and perhaps a 75cc up front, which will further increase the wing loading and cubic wing loading.

    But, as ahicks said, the R70 flies beautifully with 'robust' wing loading for her size, so it will be hard to predict the flight characteristics of the R90. Has anyone yet clicked 'buy'?

  3. #5778

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    RE: Larger Revolver

    OK Guys, here are the numbers

    R59 || R70 || R90
    Wt 7# || 9.5# || 21#
    Area 563 || 832 || 1303
    WS 59" || 70" || 90"

    WL 28 || 26.3 || 37.1 oz/sf
    CWL 14.5 || 10.9 || 12.3 oz/cubic ft
    Stall speed 26.5 || 25.4 || 30 mph

    [sorry about the poor table formating]

    Wing loading WL is high, but again this is a relatively big bird.
    Cubic wing loading CWL suggests flying feel between the R59 and R70. R90 is a bigger plane, higher stall speed, but not dramatically so.
    Obviously the numbers will be a bit different depending on how they build. My R70 is 9#11oz dry, so is a bit heavier than this table. I picked the heavy end of the wt range from the tower data. I think the CWL demonstrates why the R70 seems to be a little better behaved airframe than the R59.

    I dont think she will fly like a warbird at all. I may be wrong.

  4. #5779
    lopflyers's Avatar
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    RE: Larger Revolver

    Awesome comparison. See the stall speed od the R59 is higher than the R70. 
    Thats why is more difficult to land
    Hopefully the R90 isn't going to fly like a warbird. I try to stay away from those.
    Keep your wings level
    Club Saito Member #693

  5. #5780

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    RE: Larger Revolver

    wjc - I've put my hat in the R90 ring (it's in my shopping cart). Not saying I can afford to pull that trigger right now...

    btw - you made me Google "Cubic Wing Loading" and I found this thread here on RCU. It ain't so straight-forward - lots of discussion about the meaning and merit (ex - whether it is only a valid measure for planes of the same size and type). But certainly interesting.

    http://www.rcuniverse.com/forum/m_11...tm.htm#1176152

    And here's a wing cube load calculator: http://www.flyrc.com/tools/calculator.html

    The R90 produces a CWL of 11.8 (using 1,300 sq in and 320 oz (20 lbs).

  6. #5781

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    RE: Larger Revolver

    I just plugged in the Rev70 into the Wing Cube Loading calculator - ends up with an 11.5. Very close to the Rev 90.

    btw - has anyone else noticed that this thread POPS right up now?? Maybe RCU did a database cleanup \ disk defrag??

  7. #5782
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    RE: Larger Revolver

    Does anyone has a O.S.120AX 2 strokes in this plane? I just received my kit and I am considering either the 95AX or the 120AX. I am more inclined to install a 120 but I am wondering about modification. Will I need to modify anything in order to install the OS120AX? If yes, how about the 95AX?

    Thanks,

    Harry

    What\'\'s rudder?

  8. #5783

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    RE: Larger Revolver

    1.20AX is a great engine for this plane. My first R70 has that combo and it was spirited. No substantive mods needed.

  9. #5784

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    RE: Larger Revolver



    +1 on the 1.20ax
    I currently fly my Revolver with the 1.20ax, I used the muffler extension and it fits perfectly.


  10. #5785

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    RE: Larger Revolver

    1.20 AX guys - what prop are you using? Just saw that it puts out 3hp at 9,000 rpm - that's more hp than the DLE 20 (which is PLENTY for the Rev 70!). On my Rev 70 \ OS 120 4s I just moved from an APC 16x8 to an APC 15x10 and I like the added quickness.

    With the 1.20 AX can you get 9,000 RPM on a 15" prop?

  11. #5786

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    RE: Larger Revolver

    I started with a 16x6 now Im using a 15x8 and like it better.  I think you could go with the 15x10 or even a 15x12.  On the OS page they list the recommeded props as15x10-12 and 16x8-10.  I'd be interested in seeing how the 15x12 preforms, looks like its time to go visit the LHS......

  12. #5787

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    RE: Larger Revolver

    My view is that the RPM power band for the glow engines is quite a bit higher rpm than for the gasser. My AX 1.20 flew best on a 16x6, and seemed over loaded at 16x7 or 16x8, whereas the DLE20 turns the 17x6 and 16x8 pretty well.

    I have come to like high pitch props on the R70; might think of a 14x10, rather than 15x10, to allow the engine to rev a bit.

  13. #5788
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    RE: Larger Revolver

    15x10 gits it with authority i put on my 95ax an had lower my prop size  is could get the rpm  1.20 ax was built for this beast have a pits sulivent muffler an popped to hole in the top of the cowl to connect  an remove the muffler and it will balance perfect withthe battery just under the wing tuben i also put a screw on the top of the cowl  at the fire wall due to the vibration of the engine quiets the beast down  good luck
    CORSAIR BROTHERHOOD #85

  14. #5789

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    RE: Larger Revolver

    .

  15. #5790
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    RE: Larger Revolver

    microdon hope u dont have a problem an have only have good intentin withthe ***** comment
    how old are you 5??
    CORSAIR BROTHERHOOD #85

  16. #5791

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    RE: Larger Revolver

    Chandley - sorry, was being a wisenheimer. Comment deleted.

  17. #5792

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    RE: Larger Revolver

    Someone admitted they were wrong and apologized. I tip my hat to Microdon!!

  18. #5793

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    RE: Larger Revolver


    ORIGINAL: Slow and Steady

    Someone admitted they were wrong and apologized. I tip my hat to Microdon!!
    + a million! I will be one of many to admit the spelling and grammar bugs the you know what out of me sometimes!

  19. #5794

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    RE: Larger Revolver

    Flew my revolver again today. Very fun. THE Garmin GPS was onboard and it clocked max speed at 120 mph. I don't believe I should go to 14 x 12 prop. I was using the 15 x 10 prop today. It was coming in fast for landing and I damaged landing gear plate. It is now fixed. I was flying plane at a cotton field and tried to land plane on 8 foot wide runway for the cropduster
    AMA # 982277
    Dalton 300 ML DA 200, KS cans
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    Extreme Flight YAK 54 91" DA 70
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    GP Revolver 70 Saito FA1.25
    JETI is the only way!!!!

  20. #5795

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    RE: Larger Revolver

    Geez, 8'? Seems like a crop duster is several times the size of a Revolver. If he can make it ok ......

  21. #5796

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    RE: Larger Revolver

    Noticed the R90 on Advantage Hobby for $417 and free shipping.

    Neil

  22. #5797

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    RE: Larger Revolver

    It's only $380 on TowerHobbies if you are a super saver club member. I think shipping would only be $10-15.

  23. #5798

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    RE: Larger Revolver

    Orthobird - 120mph with an APC 15x10?? Sounds awesome - what engine? I flew this morning with my Rev 70 \ OS 120 \ APC 15x10. I'm liking the 15x10. Might have to test a 14x12.

    My newest move - nothing earth-shattering, but still fun - is a low, slow-as-possible inverted pass. 3-4 feet off the deck, on a high idle. This plane is SO stable, even inverted, at low speeds. Specially with a 7mph headwind.

  24. #5799

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    RE: Larger Revolver

    hi. i found it there for 430, and i am in that super saver club. where did you find it for 380?
    ORIGINAL: Sbach342Guy

    It's only $380 on TowerHobbies if you are a super saver club member. I think shipping would only be $10-15.
    AMA # 982277
    Dalton 300 ML DA 200, KS cans
    DALTON 260, 40%, DA 150, Pro Flow cans
    3DHS Extra 330 LX 120" DA 170
    Bill Hempel Yak 40% DA 170
    Great Planes Matt Chapman Eagle Cap DA 120
    Extreme Flight YAK 54 91" DA 70
    Hangar 9 Extra 260 DA50
    Extreme FLight Extra 300 78" DA35
    GP Revolver 70 Saito FA1.25
    JETI is the only way!!!!

  25. #5800

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    RE: Larger Revolver

    saito 125 4 stroke 15% nitro
    if you can do that, you are a great pilot. ive tried that before, but outcome was not good.
    ORIGINAL: microdon2

    Orthobird - 120mph with an APC 15x10?? Sounds awesome - what engine? I flew this morning with my Rev 70 \ OS 120 \ APC 15x10. I'm liking the 15x10. Might have to test a 14x12.

    My newest move - nothing earth-shattering, but still fun - is a low, slow-as-possible inverted pass. 3-4 feet off the deck, on a high idle. This plane is SO stable, even inverted, at low speeds. Specially with a 7mph headwind.
    AMA # 982277
    Dalton 300 ML DA 200, KS cans
    DALTON 260, 40%, DA 150, Pro Flow cans
    3DHS Extra 330 LX 120" DA 170
    Bill Hempel Yak 40% DA 170
    Great Planes Matt Chapman Eagle Cap DA 120
    Extreme Flight YAK 54 91" DA 70
    Hangar 9 Extra 260 DA50
    Extreme FLight Extra 300 78" DA35
    GP Revolver 70 Saito FA1.25
    JETI is the only way!!!!


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