BeechTalk - BT

Username Protected · **Posted:** 16 May 2020, 10:31

Atmospheric conditions change, that Is what the “red”adjustment levers are for.

Robert brings up a good point, the GTISO520’s are designed to run at WOT Max power indefinitely. No restrictions

So why the green band?

Username Protected · **Posted:** 16 May 2020, 11:57

Username Protected wrote:

RAM Produces a really good recommended power settings chart. Just toss it in the cockpit. I used it all the time when we had a 421C

David, do you have a copy of this anywhere? I can’t seem to find it online. Thank you all for your responses. We have a flight to San Marcos tomorrow and it will be interesting to try out a few of these settings

Username Protected · **Posted:** 16 May 2020, 12:24

Attachment:

2013-11-14 09.17.26.jpg

Attachment:

2013-11-14 09.17.33.jpg

Username Protected · **Posted:** 16 May 2020, 17:23

Pic of temps in the climb at 35/1900, should be able to read the MVP's if you open the pic and zoom in.

The left engine has less than 5 hours on it...I'm surprised at how well matched the individual temps are so far.

Username Protected · **Posted:** 16 May 2020, 17:46

Username Protected wrote:

Attachment:

2013-11-14 09.17.26.jpg

Attachment:

2013-11-14 09.17.33.jpg

That Ram chart is old, if you have a good engine monitor and know how to use it ,you will discover how antiquated it is. It’s still better than nothing.

Username Protected · **Posted:** 16 May 2020, 18:16

Username Protected wrote:

Attachment:

2013-11-14 09.17.26.jpg

Attachment:

2013-11-14 09.17.33.jpg

That Ram chart is old, if you have a good engine monitor and know how to use it ,you will discover how antiquated it is. It’s still better than nothing.

Username Protected · **Posted:** 17 May 2020, 18:45

Username Protected wrote:

I have run one set of engines out to TBO and I am working on my second set of new engines.

Max power to 1,000 AGL with 45/46 gallons per side. TIT’s on TO should be 1500 or less.

Climb 32.5 and 1900 (top of the green ). FF should then be 31 to 32 GPH in the climb and all Cylinder head temps below 380 this is important. Mine run 285 to 350 in the climb. TIT’s in the climb should be 1400 to 1450.

For cruise my favorite power setting is 31/1700 and TIT’s 1500 to 1550 and 19.5 GPH per side. Standard day 15,000 that’s 61% power so I can run right at peak. This gives me about 207 KTS TAS.
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Jerry, what is peak for you? I hear this strategy from time to time but what is your peak based on? We’ve never peaked out the 421 or run it LOP. We don’t have the RAM engines so top of green is 32.5. We usually climb at 32.5/1900 but we don’t touch the mixtures. Should we be leaning in climb? Thanks all for the responses!

Username Protected · **Posted:** 17 May 2020, 19:15

Username Protected wrote:

“I strictly go by what RAM suggests, they are adamant against Lean of Peak, so far I am finding the sweet spot for 73.5% at 32MP/1900RPM/24GPH to keep the TIT in the mid 1500 ranges, I have been toying with 29MP/1800RPM/19GPH, Like the old saying goes, "Fuel is cheaper than Cylinders"

“
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Mr Wagner are you in cruise with those power settings?

If so that’s ok but it’s definitely not the sweet spot for TAS and efficiency. I would definitely not use that power setting in climb. It would be too lean.

At higher altitudes and GW sometimes a little more power will lower the angle of attack and give a few more miles per gallon.
Enjoy your 421C.

Username Protected · **Posted:** 17 May 2020, 23:59

Username Protected wrote:

“I strictly go by what RAM suggests, they are adamant against Lean of Peak, so far I am finding the sweet spot for 73.5% at 32MP/1900RPM/24GPH to keep the TIT in the mid 1500 ranges, I have been toying with 29MP/1800RPM/19GPH, Like the old saying goes, "Fuel is cheaper than Cylinders"

“
————————————————————————————————————————————-
Mr Wagner are you in cruise with those power settings?

If so that’s ok but it’s definitely not the sweet spot for TAS and efficiency. I would definitely not use that power setting in climb. It would be too lean.

At higher altitudes and GW sometimes a little more power will lower the angle of attack and give a few more miles per gallon.
Enjoy your 421C.

Username Protected · **Posted:** 18 May 2020, 00:08

Ok thanks for the reply. Enjoy your beautiful 421C

Username Protected · **Posted:** 18 May 2020, 10:14

Username Protected wrote:

RAM had some silly STC which repainted the MP gauge and magically “allowed” you to climb at 35”... I’ll give them credit for finding people dumb enough to pay them for the STC, but the airplane didn’t know it had a differently marked MP gauge.

Robert

Robert,

I demand an apology.

It certainly was a paperwork STC, but I knowingly bought it. I liked having the gauges in the green at 35", especially with the engine monitor.

Best,

Dan

Username Protected · **Posted:** 18 May 2020, 12:04

Username Protected wrote:

I demand an apology.

Heck Dan, I think you just proved my point. That's what happens when lawyers fly airplanes ;>

Robert

421C Power Settings