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Juhl-EZ

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Posts posted by Juhl-EZ

    Useful Load Long EZ

    in Long-EZ

    Posted

    snip, snip, snip.... and I am trying to get a good cross-section in this thread of what people's planes ACTUALLY ...... snip, snip, snip..... I humbly request more data points for long EZ weight and engine data

    -Chris... end snip

    Based on data supplied by CSA I have done a small Long-Ez weight study, mainly to find the impact of the use of the popular O-320 engine option.

     

    So please find som digest data points.

     

    Based on data for 92 nos. O-235 powered vs. 107 nos O-320 powered versions of the Long I found that:

     

    • O-235 Long-Ez, average weight 896 lbs (Max. 1050 lbs/Min. 791 lbs)
    • O-320 Long-Ez, average weight 961 lbs (Max. 1084 lbs/Min. 845 lbs)

    I have done simple 'data wash' like removing what is (hopefylly) typos like a a 400 or 1400 lbs empty weight.

     

    Now go figure based on Marcs accurate numbers from the POH :confused: and you will conclude that most LE are flown significantly over gross.

     

    And its not simple to estimate what *real* resserve is hiden in Burts design. This would have to consider such 'simple issues' as structural strengt including buckling of structures with unknown imperfections (read builder competence, variances in dimensions and material properties among other) and structure/flow interaction (Flutter)

     

    Everyone are free to make up their own opinion on the subject (including that on MTOW) but beware that you will most likely only know the 'true' limit by means of the first NTSB report.

     

    I guess this is where the the 'Experimental' part comes in ;)

     

    Safe building,

    Henrik

    2008 OSH AirVenture Anyone?

    in Events, Fly-ins, and Trip Reports

    Posted

    Hi all,

     

    I have made a cunning plan :cool2: - and as a result, the family summer holidays will be spend in the US. So after the dear wife and my daughters return to Denmark I will spend 4 days at Wittman with permanent residence in Camp Scholler (Tuesday through Friday) :banana: :banana:

     

    Any particular location/time during the event to find fellow canardians:confused: Marcs forum on Thursday for sure - anywhere else?

     

    (Rutan followers: I guess it's no longer enough to turn your cap around the wrong way to indicate you inclination...)

     

    Juhl-Ez

    Pre building an Open-Ez (90% complete... Workshop nearly done, procuring materials)

    Rutan fiberglass specs

    in Materials

    Posted

    Is this confirmed?

    If it is, then this is great news. Every foreign builder needs to be made aware of this information.

    Over here in Europe those Interglas numbers are used extensively to describe glass cloth. This also means that Europeans can get the glass for cheap locally without having to order it from the US, 92125 and 92145 are easily available from every fiberglass supplier.

     

    For what it is worth, all Longs and Cozies build in Denmark have AFAIK been build using those Interglass cloths. AFAIK these where the ones originallay used by BR.

     

    Comparisons of Hexcel and Interglass types along eith and conlusions would be most welcome.

     

    I have attached an (old) Interglass datasheet showing the properties for both.

    Interglass.pdf

     

    Regards,

    Henrik Juhl

    Cruise Deck Angle

    in Other Modifications

    Posted

    There is an article in the one of the CSA newsletters on it - some guy took a smartlevel on board and went flying. I'll look up the reference tonight.

     

    Ever since I wrote that, I have been trying to find out just where I did read about this - and tonight, I quite by accident stumbled across it again. (The reason I could not find it was that the title of the write-up was different from what I thought it should be).

     

    I'ts an very thorough article by Tom Staggs presented in CSA newsletter issue 73 page 25 (i.e January 2004) 'Wing Fence Effects'. His measuremenmts show a deck angle of 1.8º at 150 KIAS increasing to 4.1º at 110 KIAS. 3º is found at app. 130 KIAS - so you could be right depending on your cruise speed..

     

    Hope this helps - I myself have bookmarked the CSA for doing main gear fairings...

     

    Regards

    Henrik

    External rudder conduit.

    in Long-EZ

    Posted

    ....and the bolt hole in the aluminum is unlikely to be the weak point in the system.

    Just my 2 cents... I may be wrong, but it would seem to me that both landing 'impact' (Sorry I'm not familiar with your landing style...;) ) and braking would tend to excert upward fores on the rear bracket - i.e. the failure mode is not likely to be tearing of bolt upwards through the (too) short edge distance...

     

    Henrik

    What else would you include?

    in Open-EZ

    Posted

    In my book you need:

    • Moldless Composite Homebuilt Sandwich Aircraft Construction (3rd Ed) (TERF CD)
    • Long-EZ plans (TERF CD)
    • Enhanced Performance Rudder (TERF CD)
    • Roncz canard construction (TERF CD - minus templates)
    • Internal rudder bellhorn (TERF CD)
    • Varieze Landing/Speed brake plans (TERF CD)
    • Owners manual (2nd Ed) (TERF CD)
    • O-235 Engine Installation (TERF CD - Good reference even if not installing 235)
    • Open-Ez drawings templates (A1-A14) (Open-Ez Rev. 5)
    • Canard Pusher Newsletter #24 through #83 (TERF CD)
    • Central States Association Newsletters 1990 to present (Terry Schubert)

    So first of, go buy the TERF CDs. Do not copy part of this to anyone - give Matt the business - he bought the 'right' to material from Burt. And it is very good value for money! (There is even rumours that Burt is getting royalty - guess its only rumours...)

     

    So in fact all you are missing is the full scale templates for the Roncz canard - I'm currently check-ing if it is a viable solution to scale up the template page of the TERF CD and if it's accurate.

     

    In UK the PFA has collected a data sheet (TADS 074A) of what they deem to be checked for a long – you may find that usefull, as it sort of collects many of the known shortcomings (referred or remedied in the CP newsletters). It can be found here: TADS 074A

     

    Most other documents can be considered 'background material' - useful but not required. Get the above and start building - the rest will follow.

     

    Hope this is useful to you :)

     

    Best wishes

    Henrik

    Cruise Deck Angle

    in Other Modifications

    Posted

    I have read many times that the Long-Ez cruises with about a 3 deg nose up attitude

    I on the contary have read that the cruise AOA (measured against upper longeron) is in the range of 1.5º to 2.0º... :confused:

     

    There is an article in the one of the CSA newsletters on it - some guy took a smartlevel on board and went flying. I'll look up the reference tonight.

     

    Regards,

    Henrik

    TERF Cd.

    in Coffee House

    Posted

    Alright.. now this is a really dumb question, I didnt see it on their website... but.. is the TERF CD a single disc, two or a 3 disc set? I am asking because I found a 3-CD 'rutan encyclopedia, volume 1, 2 & 3' for sale locally, for 50 bucks less. :envy:

    AFAIK they are the same thing - mine is a 3 CD collection name encyclopedia. However I do not know if different versions have been avialable through time...

    Introducing the Open-EZ Tandem, a 2-place tandem canard

    in Open-EZ

    Posted

    To whom it may concern... (or should that be "To those who have concerns...")

     

    I too have now had the template drawings A1 through A14 printed - and if value to anybody - I can confirm what others have found i.e. if the drawings are printed unscaled they come out as they are supposed to, and aligns perfectly with the corrected check measurements given below:

     

    A2: printed tick marks say: 23" x 17", actual: 23" x 16"

    A7: printed tick marks say: 18 1/8" x 23 1/2", actual: 17 1/8" x 22 1/2"

    A10: printed tick marks say: 22" x 17", actual: 21" x 17"

    Personally I found it very reassuring to se the full scale prints match up so nicely. So do not let this issue put you off the idea of becoming en 'EZ-opener'...

     

    Regards,

    Henrik

    Special performance canard (Roncz) - Template measurements

    in Open-EZ

    Posted

    Is anybody willing to/capable of finding their 'original' full scale Long-EZ drawings/templates and measuring the the two dimensions A and B of the 'G' template as shown in figure below... (For the sake of 'absolute precission' lets say measure from the OUTSIDE of lines at both ends)

     

    This would allow somebody... (including owners of the TERF CDs) to scale their page C-3 including all the templates for roncz canard to something more ... eh... usefull..... for educational purposes that is;)

     

    post-3931-141090159219_thumb.jpg

     

    Regards,

    Henrik

    Long Speed Brake Plans

    in Open-EZ

    Posted

    The Long-EZ plans (original) have a copy of the Vari-Eze landing brake plans. That's what you will be looking for on the Terf CD

    Right on TMann :banana: Thanks!

    Does indeed seem that the Long refers to Section VI of the Varieze plans. On the TERF CD this file is located in the Varieze folder as VEZVI.PDF.

     

    BTW: LPC #35 changes the dimension from 16" by 16" to 17½" by 17½".

     

    Thanks for your help.

     

    Henrik

    Long Speed Brake Plans

    in Open-EZ

    Posted

    Now that RAF is entirely out of the homebuilt buissness - how would one go about getting an educational look at the 14$ (RAF) speed brake plans for the Long-ez:confused:

     

    They are not in the Open-Ez package, nor are they included on the TERF CD. I do not suppose they contain any templates so scaling is not a concern...

     

    Regards,

    Henrik

    LMGA Assembly

    in Long-EZ

    Posted

    I'm having an issue with the full scale drawings of the 2 X 2 aluminum extrusions on page 9-3.....

    Bruce,

     

    I don't have the answer to your question - just seems this is the right point in time to ask you if you have considered the "Desired - strongly recommended but not requiring grounding of the aircraft" modification of the extrusion found in Canard Pusher #27 - which sounds:

     

    "Move the 3/8" holes in all four extrusions up 0.4". Also modify outlines to maintain original edge distances around the 3/8" hole. This moves the entire main gear up 0.4", resulting in an improved gear-fuselage juncture reducing aerodynamic drag."

     

    Henrik

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