oil change and general inspection, 1000 hrs

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A2022
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Joined: Sat Mar 05, 2022 8:52 am
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oil change and general inspection, 1000 hrs

Post by A2022 »

some photos. the oil filter drain works well, no mess. carb heat mechanism looks good at 1000 hrs, pristine actually, all original. I cleaned the air filter in place and did not remove it. this is a simple machine. no complicated electronics.


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Steve Melton
RV9A, Superior O-320 (roller cams), WW 200RV prop, Dual impulse slick mags, CHT 330F, EGT 1300F, Oil pressure = 65 psi, B and C Alt, 1000+ hours
Freedom and Democracy are all that really matter.
https://www.rvplasticparts.com/

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A2022
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Joined: Sat Mar 05, 2022 8:52 am
Location: Cincinnati, OH
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airbox brace failure, 1000 hrs

Post by A2022 »

the airbox brace failed at 1000 hrs. I have the original thin airbox plate, so I originally braced it with alum 3/8-inch OD tube smashed on the ends. this is not an ideal mechanical design but rather quick and dirty. I was surprised it lasted so long. I decided to stay with the design and changed to SS tube and 1/2-inch OD. SS is a lot better for fatigue, so I believe this one will go to 3000 hrs. it only took 1 hr to fab since I had the original, so not too bad. what you want is the brace to be a nested fit with no stress (deflection) of the top plate when installed. in this way the assembled fit is in a stress-free condition. I believe the primary stress on this part occurs when you remove and install the cowl. this is the first structural part I have needed to replace. while not the optimum mechanical design (smashed and bent tube) it is compact, smooth, really stiffens the airbox and should allow for 3000 flt hrs.


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Steve Melton
RV9A, Superior O-320 (roller cams), WW 200RV prop, Dual impulse slick mags, CHT 330F, EGT 1300F, Oil pressure = 65 psi, B and C Alt, 1000+ hours
Freedom and Democracy are all that really matter.
https://www.rvplasticparts.com/

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bullojm1
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Re: oil change and general inspection, 1000 hrs

Post by bullojm1 »

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This is my solution and it seems to be holding up for about 500 hours now.
Mike Bullock
http://www.rvplane.com
RV-7 | Superior IO-360 | Whirlwind 200RV
Garmin GTN650 | GRT Dual Sport SX EFIS
Status: FLYING!

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A2022
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Posts: 452
Joined: Sat Mar 05, 2022 8:52 am
Location: Cincinnati, OH
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Re: oil change and general inspection, 1000 hrs

Post by A2022 »

the weird thing for me, I was hearing some unknown buzzing or unusual wind noise for the past 5 flights, something. could it have been the airbox brace had failed 5 flights before? maybe... after the brace replacement the unusual noise was gone. Mike's brace is easier to fit in a stress-free condition by drilling in place and then riveting, but mine is shiny-er. :)
Steve Melton
RV9A, Superior O-320 (roller cams), WW 200RV prop, Dual impulse slick mags, CHT 330F, EGT 1300F, Oil pressure = 65 psi, B and C Alt, 1000+ hours
Freedom and Democracy are all that really matter.
https://www.rvplasticparts.com/

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