Model B. Measurement from spar web to splice

[augman40]

Looking at the prints and the measurement from the spar web to splice is 86.19, am I reading this correct? Tried loading picture but won't load.

[Redneckmech]

Yes it is assuming you are referring to main spar,

Pretty sure I measured it and double checked 6-7 times before I got the gumption to trim my webs.

Spar web to splice measurement is to end of web, and total length of spar (both webs together @ 172-3/4) is measured from the center of the attach bolt, so make sure to be careful of what you use for your datum.

Share pictures of your project when you can!

[augman40]

Probably a dumb question but how is 86.19 measured on a tape measure? That’s very precise for a tape measure?

[Chris In Milwaukee]

.19 = 3/16 (.1875)

[Redneckmech]

My recommendation would be to mark it out but leave the web long and use the attach hole as your datum. Trim it once you have your attach plates in place. I used the attach hole as my datum and once the attach plates were installed I trimmed the web to length using my router and a flush trim bit. Here are a couple of photos:

https://eaabuilderslog.org/?blprojentry&proj=7reiBV4ta&e=8Iw3EN33T&listcat=^r esearch&sid=

[geraldmorrissey]

Probably a dumb question but how is 86.19 measured on a tape measure? That’s very precise for a tape measure?

I used a measuring tape for long distances, but get a Stanley 12' Powerlock with decimals and fractions, model 33-272. Get used to working close, buy a 6", and a 12" engineering scale. On one side 1/32" and 1/64" graduations, on the other decimal graduations. Two decimal's is not particularly close but close enough for most general airframe work. Figure +/-.030. Also a 8" HF electronic digital caliper is essential. Always measure to the same datum. Avoid chain measurements. Good luck.