Norman: "that is a continuous limit, not a momentary limit."
care to share your perspective more? I can't help but disagree about it being a redline limit. I'm not willing to contest that a momentary overtemp will cause damage when routinely operated that way... but ... if 1650 is not your redline momentary... what is?

You think that is impressive Forrest - your plane was in Playboy!!

Really?

Which issue?

Was it a picture or just mentioned in an article?

:

American Hustle was shot at KOWD (Norwood). The falcon jet is a local charter. My plane was a blurry blob in the background. Does that mean I'm famous?

Is that your Aerostar in the background? I love trivia like that and would love to know the N# on that plane!

Turbomachinery continuous limits are normally 5 minutes. AFAIK there is no upper momentary limit published on TIT for my airplane. Therefore, passing above 1650 deg F for a few seconds while leaning for LOP operations is not any particular obstacle. John D and George have written extensively on this.

Just a random thought from another thread, but if TIT is limiting and CHTs have some margin - would this be an application for something like an electroair electronic ignition?

It seems that electroair users are seeing 20 - 30F increases in CHT, but that goes along with a reduction in EGT.

I would think so.

Tim

From my reading (and conversation with the folks at ElectroAir) about how their electronic ignition works, the performance increase comes from advancing the ignition timing at higher altitudes (lower MAP).

On a turbo charged aircraft MAP stays above the threshold for getting the advance, therefore folks with turbos won't see the performance increase the normally aspirated folks get.

Of course, a 600 Aerostar (with winglets) and a pilot willing to breath O2 ought to see a significant gain from electronic ignition.

For those who wondered about this....

After serious considered evaluation of the pictures (from the mid-90s), it appears my plane WAS used as background for a photo shoot of a young woman who appeared to have misplaced her clothes.


Unfortunately, I won't be able to post pictures (for obvious reasons), but if someone has a collection that goes back to 1994, they can verify the facts for themselves.

As I consider Electronic Ignition (EI) for my TN bird I am in complete agreement, there should be no real benefit >24" of M.P. That said, even TN installations are reporting a 20-30F rise in CHT - a very interesting result. The claims for EI are a 6-15% reduction in fuel burn under all conditions (and going up much higher at higher levels of advance). This can only be true if something beyond the timing is occurring.

Since I don't believe in pixie droppings and unicorn farts, but do believe what is being reported has some basis in fact, I am trying to understand the PFM which seems to be occurring. Does the much more energetic spark which occurs over ~20 degrees of crank travel (as opposed to ~5 degrees for a conventional mag) actually result in more complete combustion in the cylinder? Does the more accurate and repeatable timing make better use of the fuel? I bring all this up only because if you could get ~10% more power out of an Aerostar when running LOP, that would seem like a phenomenal result. I am certainly not saying that this would happen, but the specific limitation that has been described (High EGT, Low CHT) seems ideal from the anecdotal reports.

Hopefully we will get some better data when less expensive EI hits the market and it's use becomes more prevalent (I would do it today for $2K just to resolve all starting issues). In any event, I do not mean to distract from this Aerostar thread so I will bring back the focus with a question.

How effective is the air conditioning for the Aerostar? Why is there a need or desire to open the door when you are on the ground exposing you to the potential hazard of the propeller?

I have the electric AC and the old style duct.

It can drop the temp about 10-15 degrees from ambiant which helps but on a 95 degree day my Chevrolet pick up does a better job. The new style duct from AAC is supposed to improve AC performance.

IMO the open the door is one of the cool features of the Aerostar, sure the prop is out there and is invisible but there is no temptation to stick an arm out there (for me).

I don't have A/C and I've tried taxing with the door open but it scares the crap out of me

I've been meaning to create a small block of some form that you could use to keep the door open a few inches.

Glenn

Glen,

I'm not crazy about anything that could go out the door and into the prop.

I don't have A/C and I've tried taxing with the door open but it scares the crap out of me

I've been meaning to create a small block of some form that you could use to keep the door open a few inches.

Glenn