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  #381  
Old 02-24-2016, 05:14 PM
sblack sblack is offline
 
Join Date: Dec 2009
Location: Montreal
Posts: 1,520
Default

Thanks for posting. I hope to get there 1 day....
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Old school simple VFR RV 4, O-320, wood prop, MGL iEfis Lite
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  #382  
Old 02-24-2016, 09:32 PM
simpkinsona simpkinsona is offline
 
Join Date: Dec 2010
Location: Vacaville, CA
Posts: 211
Default EGT

That PMAG problem explains your EGT fluctuations from another thread

-Andy
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RV-9a Subaru engine.
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  #383  
Old 02-26-2016, 09:07 AM
MK77 MK77 is offline
 
Join Date: Apr 2013
Location: Evanston, IL
Posts: 139
Default Google Photo

Totally unrelated question but how did you get the photos embedded from G Photo? I can never seem to figure it out now that they switched from Picassa.
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RV-7 Tip-up - Flying!
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  #384  
Old 03-06-2016, 01:34 PM
Billythekid Billythekid is offline
 
Join Date: Jan 2016
Location: South California
Posts: 244
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Why a fastback? Looks ? Or performance? I'm a newbie so I must ask.
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  #385  
Old 03-06-2016, 05:36 PM
sblack sblack is offline
 
Join Date: Dec 2009
Location: Montreal
Posts: 1,520
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There is a considerable drag reduction with a fast back. The airflow behind a stock canopy on a -4 or -8 is completely separated.

Looks are in the eye of the beholder.
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Old school simple VFR RV 4, O-320, wood prop, MGL iEfis Lite
VAF dues 2020
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  #386  
Old 03-06-2016, 06:19 PM
AX-O's Avatar
AX-O AX-O is offline
 
Join Date: Jun 2005
Location: SoCal
Posts: 2,545
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All, i am respectfully requesting no thread drift. This thread is to document my work and build so others can use it. I rather not discuss items on this thread that can be easily found on VAF using the search function. That being said, some answers below.

Quote:
Originally Posted by simpkinsona View Post
That PMAG problem explains your EGT fluctuations from another thread

-Andy
Unfortunately that is not the case. No change after receiving the fixed PMAG.

Quote:
Originally Posted by Billythekid View Post
Why a fastback? Looks ? Or performance? I'm a newbie so I must ask.
Billy, the short answer is both. I like the looks and in theory it does reduce drag. However, i wont know how much because this is the only configuration this aircraft will be in. Use the "search" function on VAF. This has been previously discussed. If you want more info, send me a PM with your phone number and i will give you a call. Good luck with you build.

Quote:
Originally Posted by sblack View Post
The airflow behind a stock canopy on a -4 or -8 is completely separated.
I am an Aero Eng and would not personally make this statement. "Completely" is not a true statement. There is 3D flow around the canopy. Meaning the flow around the sides of the canopy also affect the flow coming off the back. Without flow/drag measurement all we can say is that the fastback is more efficient based on aerodynamic theory. We can't say by how much unless we measure it.

It does however look cool!
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RV-4 fastback thread and Pics
VAF 2020 paid VAF 704
The information that I post is just that; information and my own personal experiences. You need to weigh out the pros and cons and make up your own mind/decisions. The pictures posted may not show the final stage or configuration. Build at your own risk. Further more, these are my opinions and not those of my employer.
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  #387  
Old 04-28-2016, 05:23 PM
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AX-O AX-O is offline
 
Join Date: Jun 2005
Location: SoCal
Posts: 2,545
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Folks have been asking how it is going lately.

I took my wife (and the plane) on the first trip outside our area. My wife absolutely loves the plane and told me she is attached to it already. She is really happy with the additional room that the rocket canopy/fastback offers.

A few people got to see Dilemma for the first time at the formation clinic. All the comments/feedback were positive. I learned that I don't like the pitot tube location because it complicates tie down. My other plane had the aluminum pitot line and had more clearance.

The plane flies nice. I slightly adjusted the auto pilot gain levels on this trip. It is faster than the previous plane by exactly 20kts. it also burns 1.3 gal less per hr. I love the auto pilot options to set air speed or ROD when climbing or starting to let down from high altitude. The engine temps are doing well but it is still cold outside. We will see what will happen once we start warming up again. I got a few tricks up my sleeve for cooling. I started work on a cowl flap like the one DanH made for his plane. I am not complete but some pics shown below.

Our first away from home picture


BBQ at our friends house


The all-up flight


And the nice thing about flying with your buds, nice pics.


A few of the cowl flap. It will get a trim motor later. Right now is set with two AN3 bolts. I still have to make the torque tube and a friend is trying to figure out how to take CHT/oil temp and automatically open/close the cowl flap. It is 9 inches wide so opening up the cowl flap one inch gives me 18 additional inch^2 to the exit. A 50% increase in exit area.




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Axel
RV-4 fastback thread and Pics
VAF 2020 paid VAF 704
The information that I post is just that; information and my own personal experiences. You need to weigh out the pros and cons and make up your own mind/decisions. The pictures posted may not show the final stage or configuration. Build at your own risk. Further more, these are my opinions and not those of my employer.
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  #388  
Old 04-29-2016, 01:59 AM
Gash's Avatar
Gash Gash is offline
 
Join Date: Aug 2009
Location: Goodyear, Arizona
Posts: 949
Default

Beautiful airplane Axel. Thanks for the update! Great seeing you at Madera and thanks for all the good work you did there!
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  #389  
Old 04-29-2016, 09:43 AM
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skylor skylor is offline
 
Join Date: Aug 2009
Location: Southern California
Posts: 1,023
Default Photo Bomber...

Hey, nice crop job on the fourth picture!

Skylor
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  #390  
Old 04-29-2016, 10:04 AM
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JoeBlank JoeBlank is offline
 
Join Date: Mar 2005
Location: Molalla, Oregon (KOL05)
Posts: 529
Default

Nice looking bird AC! I enjoyed looking over your work at Madera.

Of course checkerboarding the cowl flap will certainly increase the flow rate/volume too...
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