Activity Stream

Activity Stream



  1. akflyer added a post in a topic skyraider super   

    I still stick by my opinion that if they can put a sticker on the dash of a 180 hp Carbon Cub and get away with the honor system of the pilot NOT going over XXXX RPM to limit the "hp rating" then I can use the same principle of a sticker on my dash saying to only adjust the prop on the ground via a switch mounted in the cockpit.   I have a hard time believing that even the feds honestly think that a guy in a 200k plus 180 HP CC is really going to not use the full RPM available to him in his new toy.  If that can pass the grin test then I have no problems putting a sticker on my panel as well....
     

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  2. akflyer added a post in a topic Model III Weight and Balance - Need 300 in-lbs fwd   

    I talked to Dean Wilson at length about the CG issues.  The original limits were established based off some one who had never flown before building the plane and learning to fly in it.  Dean said they did factory testing and it flew best with the CG around 18".  He did caution me to not stall the plane without full flaperons if the CG was behind 20" or 21", I don't remember off the top of my head.  I like mine at 18-19" and I have flown past that.  The plane never got too squirrely on me but I did have to use some flap input to keep the nose down.  I would not think twice about flying your plane where the CG is now. 
     

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  3. Altifly added a post in a topic Parachute installation   

    thanks, that's a good help
    I guess this is this one
    is kitfox very different around this area as controls need to be disconnected to fold? 

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  4. Dusty added a post in a topic Parachute installation   

    There is an kitfox (or possibly avid) on barnstormers with a photo of a brs behind the seat aiming through the turtledeck
    Found it. kitfox IV 1200 trigear nice plane but one of the wheels is in the wrong place!
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  5. EDMO added a post in a topic Model III Weight and Balance - Need 300 in-lbs fwd   

    Larry3400,  Yes, you are correct.
           I was pointing out the fact that there was no plastic leading edge extension when the manual for the Kitfox 3 was printed, and the leading edge was the front of the spar, and all figures were taken from that point. 
    The leading edge extension started with the model 4 with the Riblett ribs, and they never changed the wording that the datum was the leading edge, although the leading edge was extended, as was the tail dimensions, and the cg range was changed.
    EdMO
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  6. Altifly added a post in a topic Parachute installation   

    thanks you answer, but BRS is not giving special instructions for AVID , as there are many CG configurations according to situation ... mine is at workshop at the moment ,having a 462 rotax without electric starter , it is one of these one can consider to do this way..
    anyway, ist'n there any picture showing installation exemples? that would help in any case..
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  7. 1avidflyer added a post in a topic Parachute installation   

    I would suggest you contact BRS. They should have recommended mounting instructions for an Avid. Usually Avids are nose heavy, even with a light engine..... What is your flying CG? Jim Chuk
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  8. Altifly added a post in a topic Parachute installation   

    this is canister version ... 
    my Avid is already "light forward" .. was really considering all possibilities to put be in front
    I can convert it to soft pack if better, I know someone who makes custom cordura packs and repack them
     
    looks like this one

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  9. Av8r3400 added a post in a topic Model III Weight and Balance - Need 300 in-lbs fwd   

    Both of my model IV airframes use (as do all kitfoxes) the leading edge of the wing as the datum point.
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  10. TJay added a post in a topic Parachute installation   

    canister, VLS, or soft pack?
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  11. Altifly added a topic in Avidfoxflyers General Hangar   

    Parachute installation
    Hello,
     
    thank you for opening me acces to the forum ... I'm french avid owner, and at the moment my plane is having a fuselage revision, new covering soon
    I have a BRS 900 and wish to install it, but I can't find any installation picture exemple .. I want to be carefull about weight balance too, is there any possibility to install in front?
    thank you in advance for help
    • 56 replies
    • 6,064 views


  12. EDMO added a post in a topic Model III Weight and Balance - Need 300 in-lbs fwd   

    Jim
         I agree - as a practical measurement should be from front of wing -
        However his cg limits, as listed in the manual, are written as measured from the front of the spar, as are all dimensions for fuel, pilot, wheels, etc - if his manual is like some others I have read.
         I don't know if Larry measured or changed all the dimensions, or went by what was listed in the manual.
    The KF3 manual does not include any additions to leading edge or tail, as none were available at the time the manual was written.
         If you change the datum line location, you have to change all the other dimensions, and that is not "by-the-book".
    EdMO
         My plane is a Foxy Flapper, a different size wing, with no kit or manual, and I have to figure and write my own limits -
    but that is a whole different story.
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  13. LSaupe added a post in a topic Model III Weight and Balance - Need 300 in-lbs fwd   

    Ed, Yep, I would make it if I corrected back to the spar.  Ultimately it may bear down to if the cuff changed the center of pressure on the wing at all.  Pressure being more set by the local wing geometry vice the leading edge (just a guess).
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  14. 1avidflyer added a post in a topic Model III Weight and Balance - Need 300 in-lbs fwd   

    Ed, I think you are correct, my memory says it's the same for all Avids (A,B, C, MK IV). As far as measurments, I would think front of wing is front of wing. A leading edge extention would move the front of the wing forward, and so that is where I would measure from. Jim Chuk
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  15. EDMO added a post in a topic KF FLAPERON   

    Rick,
         Where are you located?   I have a left KF1 flaperon but don't want to crate and ship it - I am near St.Louis, Missouri.
    EdMO
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  16. EDMO added a post in a topic Model III Weight and Balance - Need 300 in-lbs fwd   

    Jim,
          I am probably the least knowledgeable about Avids, but I am almost certain that Leni said all Avid wings are the same cg range - maybe not counting the Airdale and Magnum - but I think my Magnum book lists about the same cg range as the other Avids - I checked on that, and the Magnum cg is 11.185 to 17.5 - guess because it's longer.
    The main thing that changes is the gross weights.
    LarryS,
          The Kitfox 3 W/B uses the front spar as the leading edge for all measurements - Would you be OK in aft cg using that measurement?   The plastic leading edge addition is a Kitfox 4 or 5 modification you made, and not by the manual, so you might get by with front spar measurements and be "by the book"? 
    EdMO
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  17. 1avidflyer added a post in a topic Model III Weight and Balance - Need 300 in-lbs fwd   

    I tried to edit my last post after I sent it. Second sentence should say "It's profile is nearly identical to the Kitfox 3 wing". Having trouble editing for some reason.... The heavy hauler wing uses thicker walled spars, more ribs, and shorter length, but the shape is very similar. Jim Chuk
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  18. rickpabon added a topic in For Sale and wanted, you got it, I want it   

    KF FLAPERON
    Hi guys,
    Needing to get a pilot side Flaperon for a KF2. John an Debra will be looking into manufacturing
    these again sometime in the winter. Brett at Airdale is not able to provide service at the
    moment. I understand some Avid Flaperons may also fit. A used one will suit me fine but if there
    is anyone that can build a new one, drop me a
    line.
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  19. 1avidflyer added a post in a topic Model III Weight and Balance - Need 300 in-lbs fwd   

    Avid W/B envelope is forward: 11.185", Aft. 16.5" That is with the MK IV Heavy Hauler wing. It is nearly identical to the Kitfox 3 wing. If you are really worried about the guy doing the check flight not wanting to do it, add just enough weight as far forward as you can to get it into the Kitfox limits for his flights, and you can remove it later if you like. Jim Chuk
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  20. LSaupe added a post in a topic Model III Weight and Balance - Need 300 in-lbs fwd   

    I hear ya.  I am not trying to beat a dead horse, but unfortunately the letters don't appear to apply to the Model III.  Add to the fact that I will not be doing the functional check flight (EAA Flight Advisor will be doing that for me).  Just looking for something a bit more concrete here that indicates this increase in aft CG is acceptable/reasonable to increase the comfort factor (or at least allow for an educated decision).  The only documentation I have, that covers the Model III, is the Model III build manual with regard to CG limits.
     
    The arguments sound very convincing, but unfortunately no paper trail appaers available until I do my own testing.  I have contacted Kitfox themselves to see if they can clarify the letter 30A applicability, so maybe that will be what I need here.
     
    By chance Is there anything on the Avid lmits with the under camber wing?
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  21. EDMO added a post in a topic Model III Weight and Balance - Need 300 in-lbs fwd   

    Tie a helium balloon to the tail and re-measure - I think you are too concerned about a fraction of an inch on an outdated W/B because of the smaller elevators on the early planes - Your plane will gain weight as time goes by anyway.   Keep the letter and references from Kitfox on file, and use that to verify larger cg range.  The inspector will not weigh your plane - and probably will not read your W/B sheets - just verify that you have them.
         Sounds like you need a heavier prop like a 3-blade Warp Drive that most use, then you could haul a bag in back.
    EdMO
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  22. LSaupe added a post in a topic Model III Weight and Balance - Need 300 in-lbs fwd   

    Interesting that the original Model IV aft CG is 1/2" further back than the Model I, II,III.
     
    Also that the leading edge forner is also 1/2".
     
    Maybe the Model IV this was standard (having the former) and they added that 1/2" in to the datum?
     
    "If" I can take credit for that 1/2" I am fine.
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  23. LSaupe added a post in a topic Model III Weight and Balance - Need 300 in-lbs fwd   

    Might be splitting hairs here, but one sensitive spot in the measurement is the tail wheel measurement.  Long arm with low weight.  Gonna check this with another scale. a 2 lb error would get me there, however, this could go either way right?  I have never seen anyone indicate an incertainty value with the measurement, so it might be warranted.  Though the seat of your pants is most likely the best measument.
     
    Also, the leading edge location.  Looks like the leading edge added former is an optional install.  Mine has these installed, which causes the reference point (leading edge) to be further forward than if it did not have these. So... what are the Kitfox limit numbers based on (with or without the forms on the leading edge)?  I have seen a few without them, but assume they used the same procedure to check CG?
     
    My numbers are as follows:
     
    Empty CG: 13.84"
    Most forward: 14.29"
    Most Aft:14.71"
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  24. EDMO added a post in a topic Model III Weight and Balance - Need 300 in-lbs fwd   

    Good Post Larry3400,
         He may learn something from reading the posts in Akflyer link.   I went back and read it too.
    Marshawk,
         What numbers did you finally come up with?
    EdMO
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  25. Av8r3400 added a post in a topic Model III Weight and Balance - Need 300 in-lbs fwd   

    Here's the lik to Leni's post on CG issues:  Link
     
    Summary:  The wing flies awesome at 16-18".  20" is workable but you may need the help of flaps to get the nose down in case of a stall.
     
    My friend Dave built his hybrid with an extended Avid C fuselage with late model Kitfox wings.  His empty CG is at 16-1/8".  The extended tail gives authority to control pitch with the aft cg, without issue.  My Mangy Fox, with the enlarged tail surfaces will be more aft than my stock yellow Kitfox.  I have no worries about loading my extended baggage area to an 18" CG.
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