Cowling mod performance info

[Sabremech]

It's been a long time coming for me to get some performance numbers for my cowling mod. Today I flew a performance flight in my modified C and took my numbers. Previous data had my airplane at 148 KTAS. Today's numbers put me at 154 KTAS. I'm pleased with the initial numbers and I plan to fly several more flights and take the data again to verify with more than one flight.

With this and the decrease of CHT's by an average of 25-30 degrees Fahrenheit, I think I have a pretty good mod. The STC package is going together and I'm hoping to submit it in a couple of months and get the certification process going.

David

[Guitarmaster]

That's awesome!! How is the spinner search/mod going?

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[Sabremech]

Hi Matt, it's going slowly. That's the one big hang up from being able to get a handle on an estimate for a kit price. I will come up with a solution!

Thank you,

David

[Marauder]

David - thank you! I am, like Matt and many others, following your progress on the mod. In fact, I'm holding off on doing a paint job until I see if your mod will be available for an F.

I know you posted some pre-paint photos. If you do paint it, I would love to see what the new cowl will look like.

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[Sabremech]

Hi Marauder,

I did paint and stripe it as I know it will be a while before I paint the whole airplane. Here's a few photos if you missed it.

Thank you,

David

[Marauder]

Thanks David. Do you have a close up of how it attaches? Looks like you are re-using the lower side covers. Does it use the CamLoc attachments in the top in front of the wind screen?

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[gsxrpilot]

How do we get in line for one of these? Can I send you a deposit?

[Sabremech]

Hi Marauder,

I use all the original fasteners, although some are changed to a little longer lengths. I added 10 screws across the front to connect the upper and lower cowls. I retain much of the original cowling and structure.

Hi gsxrpilot, I'm not going to take deposits as the certification timeframe is a huge unknown. This can cause problems for people who have money out and nothing to show for it. I'll post updates as the STC progresses so anyone interested can keep track of progress.

Thank you,

David

[flyntgr1]

2 hours ago, Sabremech said:

It's been a long time coming for me to get some performance numbers for my cowling mod. Today I flew a performance flight in my modified C and took my numbers. Previous data had my airplane at 148 KTAS. Today's numbers put me at 154 KTAS. I'm pleased with the initial numbers and I plan to fly several more flights and take the data again to verify with more than one flight.

With this and the decrease of CHT's by an average of 25-30 degrees Fahrenheit, I think I have a pretty good mod. The STC package is going together and I'm hoping to submit it in a couple of months and get the certification process going.

David

If I remember correctly, you had the ARI cowl before you started the project.  Is your preliminary 6 knot increase the Delta from the ARI to your new cowl?  

[Sabremech]

Hi Flyntgr1, 

Yes, I had the ARI enclosure to start with, so you are correct. Bob Kromer told me I'd see a good number. I'm going to do several more of the same test flights in the next few weeks to verify today's result.

Thank you,

David

[Supercop0184]

Sabre - 1964 M20C model here - DEF want!

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[Raptor05121]

David, I might have missed it somewhere in this massive thread, but where did the air filter get relocated to?

Also, I'm wondering what kind of bone you can throw us as far as pricing? Over $1,000, under $3,000, etc?

[Sabremech]

Hi Raptor05121,

The air filter is relocated to the left cooling air inlet. That's the reason for needing the 201 style spinner and backplate. That gives the room needed to locate the air filter in the front baffling.

I'm hesitant to give a price estimate yet as there's still a few unknown costs for parts. When I have those costs known, then I can give an estimate.

Thank you,

David

[mike20papa]

The performance speed you give, would you share altitude, engine settings and fuel burn or EGT's

[mike_elliott]

David, thanks again for your efforts and for allowing the Mooney Summit to be your unveiling! This year, please fly down to the Summit and show this beauty off again!

 

[Sabremech]

Hi mike20papa,

 The performance flight was done at 6500 feet, 2500 rpm (using a prop tach), and full throttle. I don't have a fuel flow to measure the fuel burn and I didn't pay attention to EGT's on this flight.

 Hi Mike E, we have vacation on the calendar for the Summit and hope for good weather to fly!

 Thanks,

 David

[bonal]

Good one Daver

[Bob_Belville]

Just now, daver328 said:

Waiting for E, F and J owners to call you a liar ... Err ... Accuse you of Exaggerating your airspeed. It happens every time a C owner claims anything faster than 135. You had to have had a tailwind in all three/four directions!

Oh unfair. We're as anxious as you C owners are to get another 6 kts or more free speed. For my decrepit old E that would be about 164 kts.

[Sabremech]

2 hours ago, daver328 said:

Waiting for E, F and J owners to call you a liar ... Err ... Accuse you of Exaggerating your airspeed. It happens every time a C owner claims anything faster than 135. You had to have had a tailwind in all three/four directions!

So why can't my C be as fast as an E, F or J ?

[Ned Gravel]

Because its missing 20 ponies?

[Marauder]

19 hours ago, Sabremech said: It's been a long time coming for me to get some performance numbers for my cowling mod. Today I flew a performance flight in my modified C and took my numbers. Previous data had my airplane at 148 KTAS. Today's numbers put me at 154 KTAS. I'm pleased with the initial numbers and I plan to fly several more flights and take the data again to verify with more than one flight.

With this and the decrease of CHT's by an average of 25-30 degrees Fahrenheit, I think I have a pretty good mod. The STC package is going together and I'm hoping to submit it in a couple of months and get the certification process going.

David

Waiting for E, F and J owners to call you a liar ... Err ... Accuse you of Exaggerating your airspeed. It happens every time a C owner claims anything faster than 135. You had to have had a tailwind in all three/four directions!

Liar!!! Pants on fire!!! Feel better Dave?

[Sabremech]

1 hour ago, Ned Gravel said:

Because its missing 20 ponies?

I have a lot of that slippery go fast stuff on mine to make up for the missing ponies.

[gsxrpilot]

I flew the Bob Axiom Memorial Air Race yesterday in Taylor, TX. According to race officials, I averaged 154 kts. over the course. Some C's are slipperier than others.

[Raptor05121]

1 hour ago, Marauder said:

Liar!!! Pants on fire!!! Feel better Dave?

What kind of ASI is in the top left photo?

[Marauder]

1 hour ago, Marauder said: Liar!!! Pants on fire!!! Feel better Dave?

What kind of ASI is in the top left photo?

It is the original Mooney ASI. I sent it out to have it refaced a few years ago. Since my POH is in knots and MPH, I was able to have it refaced with the knots placed on the outside ring.