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  1. #401
    AGR413's Avatar
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    RE: Its Bobcat nice

    I recommend using the rudders, I use them often on landing and are actually very effective for knife edge flight and four point rolls as well as the usual rudder uses like coordinated turns.
    If you are flying, life is good.

  2. #402
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    RE: Its Bobcat nice

    I was pleasantly surprised how well the rudders worked.

    Blessings, Terry
    Live simply. Love generously. Care deeply.
    Speak kindly. Leave the rest to God

  3. #403

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    RE: Its Bobcat nice

    So you all would say rudders are a must for the take off roll, nose wheel alone wouldn't be enough?

  4. #404
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    RE: Its Bobcat nice

    I would say you NEED the rudders.

    The nose wheel gets you aligned on the runway, but it becomes "light" quickly and then it is up to the rudders to keep the plane tracking straight.

    There is an art . . . to flying. The knack lies in learning how to throw yourself at the ground and miss.

  5. #405
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    RE: Its Bobcat nice

    The rudders are not needed....I have them on mine, but never used them. A
    friend had a new one at the field a couple weeks ago....he didn't even install
    the rudders. It flew fine.

    FBD.
    An engineer says.... "That will not work".
    A mechanic says..."Oh yeah, watch this".
    Old age and treachery will overcome youth and skill.
    Revver Bro #4.

  6. #406
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    RE: Its Bobcat nice

    I dunno. I use them a lot to keep the plane down the centerline.

    Once it starts getting light, the nose gear is somewhat worthless.

    There is an art . . . to flying. The knack lies in learning how to throw yourself at the ground and miss.

  7. #407

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    RE: Its Bobcat nice

    Guys,

    I will be receiving my Bobcat this week. After reading all the threads I could find I still have a couple of questions.

    First, I thought I saw a post where someone ran their exhaust down through the wing to the bottom. Is that possible and how is it accomplished? Does anyone make a muffler for pushers?
    I hate all the goo that assocoated with glow and I'm sure this plane gets coated with the exhaust blowing forward into the wind.

    Second, I see a lot of guys using the Tower 75 engine. Would the AX 75 produce more power? Would it be worth the extra $$$

    Thanks,
    mike

    Nrthwing

  8. #408
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    RE: Its Bobcat nice

    Mike....the AX will not make any more power for the money. []

    The biggest prop that fits on the Bobcat is a twelve incher.

    I would go for the Tower .75.

    FBD.
    An engineer says.... "That will not work".
    A mechanic says..."Oh yeah, watch this".
    Old age and treachery will overcome youth and skill.
    Revver Bro #4.

  9. #409
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    RE: Its Bobcat nice

    ORIGINAL: nrthwing

    Guys,

    I will be receiving my Bobcat this week. After reading all the threads I could find I still have a couple of questions.

    First, I thought I saw a post where someone ran their exhaust down through the wing to the bottom. Is that possible and how is it accomplished? Does anyone make a muffler for pushers?
    I hate all the goo that assocoated with glow and I'm sure this plane gets coated with the exhaust blowing forward into the wind.

    Second, I see a lot of guys using the Tower 75 engine. Would the AX 75 produce more power? Would it be worth the extra $$$

    Thanks,
    mike

    I'm using a GMS .76, although the Tower is rated slightly better...

    As far as the exhaust.



    Hint:

    Venom makes a set of exhaust deflectors that are slightly longer than most.

    My Dubro/Tower exhaust deflectors kept coming out, even though I had glued them in place with Canopy Glue...

    I then switched to the slightly longer Venom deflectors and I have had no problem since.

    They also make a smaller deflector for race cars, which I mounted on the bottom of my bobcat to further direct the exhaust down and back.

    This mates with the venom deflector, and I've affixed them together with canopy glue.

    There is an art . . . to flying. The knack lies in learning how to throw yourself at the ground and miss.

  10. #410

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    RE: Its Bobcat nice

    Has anyone measured the all up weight of a Bob Cat with a glow engine. I know what the manufacturer suggests but it comes from someone who leaves the prop nut off for pictures.

    Bill

  11. #411

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    RE: Its Bobcat nice

    ORIGINAL: Flyboy Dave

    Mike....the AX will not make any more power for the money. []

    The biggest prop that fits on the Bobcat is a twelve incher.

    I would go for the Tower .75.

    FBD.
    The thrust would be interesting to know if you have measured it.

    Bill

  12. #412

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    RE: Its Bobcat nice

    Greetings, My best friend and I have been flying the Bobcat's for a while now and we have ended up using YS 45's with tuned pipes. We are presently turning about 18,000 RPM's with 10-6 APC props. The 45 engine has been doing very well and the plane flies very good. Have had no major problems except when I flew it the first time. Had trouble getting it to rotate but figured that out pretty quickly. Had to set the elevator up trim a little more. It was trying to hold the nose down on takeoff. Overall I have enjoyed the plane very much. It is not the rocket that it looks like it would be but we are averaging a little over 100 MPH with the setups we have now. Very stable plane. Thinking about getting the 120 and see what I can do with it too.

  13. #413

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    RE: Its Bobcat nice

    Landing gear install help. I have looked over the pictures for installing the stock landing gear in the wings, huh? Can someone please explain the install. I cannot figure it out. The block of wood with the covering and slot in it for the wire does not look like it will fit and be flush with the wing surface. Also what keeps the wire gear from just falling over? Seems I must have to drill a hole in the block for the wire to go in but ???????? So I am not sure how to proceed. Thanks in advance........................

  14. #414

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    RE: Its Bobcat nice

    Figured the landing gear out, sometimes I am a real dummy.................

  15. #415
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    RE: Its Bobcat nice


    ORIGINAL: nrthwing

    Guys,

    I will be receiving my Bobcat this week. After reading all the threads I could find I still have a couple of questions.

    First, I thought I saw a post where someone ran their exhaust down through the wing to the bottom. Is that possible and how is it accomplished? Does anyone make a muffler for pushers?
    I hate all the goo that assocoated with glow and I'm sure this plane gets coated with the exhaust blowing forward into the wind.

    Second, I see a lot of guys using the Tower 75 engine. Would the AX 75 produce more power? Would it be worth the extra $$$

    Thanks,
    mike

    Here is the answer to your question

    O.S. .75 AX ABL Engine

    SPECS: Displacement: 0.75 cu in (12.3cc)
    Bore: 1.02" (25.8mm)
    Stroke: 0.93" (23.5mm)
    Practical RPM: 2,000-16,000 r.p.m.
    Power Output: 2.4ps/15,000 r.p.m.
    Weight: 20.39 onuces (578g) w/o muffler
    26.46 ounces (750g) w/ muffler
    Recommended Props: 14x6, 14x8, 15x7
    1 ps = 735.499 watts, 2.4px*735.499 = 1765.1976 watts output at 15,000rpm




    Tower Hobbies .75 Ball Bearing ABC Schnuerle & Muffler

    SPECS: Displacement: 12.21cc (.75 cu in)
    Bore: 26mm (1.02"
    Stoke: 23mm (.91"
    Horsepower: 2.2 BHP at 15,600 RPM
    Weight: 652g (23.0 oz) (with Muffler) (jl10/00)
    Weight: 535g (18.9 oz) (without Muffler)
    Recommended Props: Break In: 12x6 or 13x6
    1 BHP =745.7watts, 2.2BHP*745.7=1640.54 watts @ 15,600 rpm


    So if you look at pure watt per rpm efficiency the OS is 10.64% more efficient than the Tower motor.

    @ 13,000 rpm that is a difference of 162 watts. The OS will spin a larger propellor which may be where you will see the advantage of the 10% greater efficiency. Not to mention those large props won't fit between the booms of the Bobcat. In this case I seriously doubt you will see the benefit of your extra $100 bones by buying the OS, the OS is also heavier than the Tower motor which means you will need more nose weight and make wing loading that much higher.

    I would like to see what the Tower .75 would do with a tuned pipe on this plane.

    If you are flying, life is good.

  16. #416

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    RE: Its Bobcat nice

    who makes a tuned pipe for the tower 75
    Don\'t go where the path leads
    But go where there is no path
    and leave a trail

  17. #417
    AGR413's Avatar
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    RE: Its Bobcat nice

    Macs is easy....

    First you will need a header...

    http://www.macspro.com/headers_side.asp

    And then a Pipe.....

    http://www.macspro.com/tunedpipes.asp

    I have also heard very good things about the Jett Mufflers

    http://www.jettengineering.com/accy/jettstream.html

    I believe some have purchased rear exhaust mufflers for the Bobcat from Jett?
    If you are flying, life is good.

  18. #418

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    RE: Its Bobcat nice


    ORIGINAL: orstraycat

    Landing gear install help. I have looked over the pictures for installing the stock landing gear in the wings, huh? Can someone please explain the install. I cannot figure it out. The block of wood with the covering and slot in it for the wire does not look like it will fit and be flush with the wing surface. Also what keeps the wire gear from just falling over? Seems I must have to drill a hole in the block for the wire to go in but ???????? So I am not sure how to proceed. Thanks in advance........................
    I put a hole in both ends of the slot. The slot runs from front to back which seems incorrect. There does not seem to be a hardwood block to hold the gear in either end of the slot. With the wheels in the forward position the other end of the wire will stick through the top of the wing. Haven't decided how to resolve the issues which are design problems. Or lack of design.

    Bill

  19. #419
    AGR413's Avatar
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    RE: Its Bobcat nice

    ORIGINAL: BillS


    ORIGINAL: orstraycat

    Landing gear install help. I have looked over the pictures for installing the stock landing gear in the wings, huh? Can someone please explain the install. I cannot figure it out. The block of wood with the covering and slot in it for the wire does not look like it will fit and be flush with the wing surface. Also what keeps the wire gear from just falling over? Seems I must have to drill a hole in the block for the wire to go in but ???????? So I am not sure how to proceed. Thanks in advance........................
    I put a hole in both ends of the slot. The slot runs from front to back which seems incorrect. There does not seem to be a hardwood block to hold the gear in either end of the slot. With the wheels in the forward position the other end of the wire will stick through the top of the wing. Haven't decided how to resolve the issues which are design problems. Or lack of design.

    Bill
    Sounds like something is drastically wrong here! In mine and I assume everyone else's planes there was a hole in the end of the slot and the slot was in a block of well somewhat hardwood. And yes they run front to back, you use two nylon hold downs over the horizontal part of the wire on each landing gear.

    I loaded a picture of how the gear fit in the slots, this was a picture I took to show that they originally sent me two of the same landing gear so ignore that part.
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

Name:	Ca82701.jpg 
Views:	2 
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ID:	823950  
    If you are flying, life is good.

  20. #420

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    RE: Its Bobcat nice

    Yes my gear location looks like your picture.

    The front of the slot is 3 1/4" behind the CG and the rear of the slot will put the wheel CL 5 7/8" behind the CG. 10 1/4" CG. My experience with other types of airplanes indicates the airplane will not rotate. The airplane will need positive ground incidence and simply fly off the ground when it gets up to speed.

    I will rely on your experience and see what happens.

    Bill

  21. #421
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    RE: Its Bobcat nice

    I think he has the retract ready version and is trying to put in the fixed gear, which is why he is confused about the installation.

    There is an art . . . to flying. The knack lies in learning how to throw yourself at the ground and miss.

  22. #422

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    RE: Its Bobcat nice

    As far as I know, there is only a retract version on the 120 size. I have not seen a smaller size fitter for retracts. I did not use the wire gear but bought Fultz's new Scorpion gear (look at their website). It is a very solid and stable gear.

    R/C Foolish

  23. #423
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    RE: Its Bobcat nice


    ORIGINAL: R/C Foolish

    As far as I know, there is only a retract version on the 120 size. I have not seen a smaller size fitter for retracts. I did not use the wire gear but bought Fultz's new Scorpion gear (look at their website). It is a very solid and stable gear.

    R/C Foolish
    My Bobcat .50 came retract ready. ( it's an option on the NP web site... )

    I put in Robart 51x retracts which have worked well.


    There is an art . . . to flying. The knack lies in learning how to throw yourself at the ground and miss.

  24. #424

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    RE: Its Bobcat nice

    Well I am probably also confused, which is nothing new and wouldn't be the first time. What is the difference when retract ready? My airplane looks like it was made for fixed gear.

    Bill

  25. #425
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    RE: Its Bobcat nice

    The retract ready have the blocks and cutouts for the retracts.

    Hopefully you can see it in this picture



    What is confusing the poster is that the plane comes with a set of wooden blocks that get inserted into the retract area here...



    These get epoxied in place and hold the gear wires BELOW the surface of the wing. Then the supplied covers get put in to fill the hole in the wing area.

    FYI: the retract gear area really needs re-inforcement as it gets a LOT of abuse even on gentle landings.

    There is an art . . . to flying. The knack lies in learning how to throw yourself at the ground and miss.


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