I completed the weight and balance on my RV-7 today . . . . .
So it appears I built a bit of a pudgy sucker.
Tom.
Moves the entire engine 2? forward. Lots of nice space between engine and FW easy to work on. You need a 320 mount and 360 cowls. Have to graft 2? to the rear of the cowls is only issue. Vans should tell people they are going to have rear cog problems with parallel valve 360 engine and light prop and give them the option of a longer untrimmed 360 cowl and 320 mount. Alternatively some people have added spaces between 360 mount and FW to push it forward during build, my thought was might as well use the longer mount and fix the problem from the get go. Limited to composite CS options and might be difficult for me to ever mount a angle valve engine and Hartzel BA later without moving some weight back but that?s easier than the other way round and unlikely to ever happen.
Moves the entire engine 2” forward. Lots of nice space between engine and FW easy to work on. You need a 320 mount and 360 cowls. Have to graft 2” to the rear of the cowls is only issue. Vans should tell people they are going to have rear cog problems with parallel valve 360 engine and light prop and give them the option of a longer untrimmed 360 cowl and 320 mount. Alternatively some people have added spaces between 360 mount and FW to push it forward during build, my thought was might as well use the longer mount and fix the problem from the get go. Limited to composite CS options and might be difficult for me to ever mount a angle valve engine and Hartzel BA later without moving some weight back but that’s easier than the other way round and unlikely to ever happen.
RV-7 Slider
IO-360M1B/ Hartzell BA Prop.
VFR single screen G3X touch, 1 comm
Basic interior, Vans seats, lightweight carpets
Painted
FlyLeds full lighting
R 511
L 511
TW 59
1081lb CG 79.07
This is in the envelope for all possible scenarios. In the aerobatic envelope with 2 up and about 3hrs of gas. I'm super happy. Now to keep it this way!
Using 68.45 for main gear and 249.19 for tail wheel arm, per the manual.
I'm doing my own W&B calculations right now and thought I would double check myself by using my spreadsheet on some posted numbers. I get a different CG using the same numbers (using the calculations on page 14-6)
For these numbers 511, 511, and 59, I get 78.31, not 79.07.
Can anyone verify whether I am doing something wrong?
Using 68.45 for main gear and 249.19 for tail wheel arm, per the manual.
Thanks
Ivan
I would really recommend you measure those which is also per the manual. Mine were different from Van's.
Thanks, Jereme,
I saw that about measuring, but assumed (perhaps incorrectly) that measurements from Van's computer drafted plans would be more accurate than me with a plumb bob and a tape measure. I figured that things like the location of the landing gear was not subject to much error induced during the build.
What does anyone else think? Use van's moment-arm numbers or determine them your self?
=Ivan
Thanks, Jereme,
I saw that about measuring, but assumed (perhaps incorrectly) that measurements from Van's computer drafted plans would be more accurate than me with a plumb bob and a tape measure. I figured that things like the location of the landing gear was not subject to much error induced during the build.
What does anyone else think? Use van's moment-arm numbers or determine them your self?
=Ivan
Total empty weight 1113 lb. Empty CG location 80.12. That's heavier than I had hoped for (aren't they all?) but entirely workable. We can top off the tanks, put my wife and I and 100# of baggage in it and still be within both max gross and CG limits.
Now on to get it licensed and flying!