Earthstar Forums

Do not confuse efficiency vs amount
A turbo engine consumes less fuel per Hp than a non-turbo
Given that the 700E is 60 Hp and the turbo is 70 Hp, if you run both at, say, 50 Hp, then, the turbo will consume less fuel per hour than the 700
But if you run each at, say, 75% power, then, probably, the turbo will consume a little bit more fuel per hour than the 700
If you are travelling from point A to point B, and since at a 75% setting, you have more Hp on the turbo, and going a little bit faster, most probably you will consume about the same fuel on both, arriving at your destination before the non turbo.
I understand that only Mark has a turbo at this time, so you would have to ask him for the exact numbers
A turbo engine is expensive and will need extra care and maintenance
The turbo section is easily seized if you shock cool it in a quick descent or if you do not let it idle for a couple of minutes before shutting it down
My advice has always been to avoid them unless:

1.- You need that extra power for take offs on short strips or high altitude airstrips

2.- You fly regularly trips so long, that it makes sense to lose some time in climbing, to be able to cruise much faster at high altitudes ( must have oxygen ) and get there faster

Otherwise, a turbo is a great waste of money

Skot
I don't see why you wouldn't have enough power for all your instruments.
My understanding is that the Turbo is so quiet that you do not need a muffler. The turbo charger eats the normal exhaust noise before it exits. I also read that the HKS is a smoother running engine than the
60 hp model less vibration. That has to be a good thing.
Fred

Get it from the expert Call Mark B

Hi Jaime
I have never heard of this shock cooling being a problem with turbo itself. I have for the Cessna Ga engines.
Also the extra care and maintenance. Could you explain further I would like to know what would be involved and perhaps examples of where you heard of shock cooling of the turbo chargers. They seem to work well in cars.
Fred

Odyssey with HKS People:

I forgot to ask a very important question:

Do you fly this plane with your right hand or left hand while in the pilot seat?

This is an overlooked but very important consideration for me because my intent is to shoot photos out the left side.

Skot

Hi From Mark Beierle, Earthstar Aircraft.
I have done 14 tests to 17,500 feet with idle throttle and high speed
decent to landing at 2,000 feet. Have not experienced any problems with the
turbo being shock cooled. this would do it, I think. 2 of the descants were
with the engine shut off all together. The HKS is oil cooled so there is no
danger of shock cooling the cylinder heads as there is in GA engines.
Happy Flying,
Mark

In a message dated 1/14/2011 1:36:10 PM Pacific Standard Time,
SWeidemann@aol.com writes:


Odyssey with HKS People:

I forgot to ask a very important question:

Do you fly this plane with your right hand or left hand while in the pilot
seat?

This is an overlooked but very important consideration for me because my
intent is to shoot photos out the left side.

Skot




Hi Skot
You can fly with either hand. Or trim it out and fly only with your feet.
I take a lot of pictures. Not having struts in the way makes for better
pictures.
Happy Flying,
Mark

Mark:

I have to admit that I had a short circuit in my brain and wrote shock
cooling instead of coke formation, which is the usual type of failure on
turbos

The usual type of failure with cracked cylinder heads is shock cooling due
to quick descents

Sorry for my typo mistake

Amen to that. I was starting to worry that my HKS Turbo dream bubble had burst. Thanks Mark for clearing the air.
Fred
Is there any chance the price will come down as many are sold.(probably not)

A larger battery won't help u if the engine/rectifier
does not have enough steady state current output.

Chk with Mark about the rectifier output.

Your steady state current should be 50-75%
of the max current. 50% is best.

-Alan Cossitt

>From my iPhone. Please excuse typos and terseness.

Hi Jamie
Maybe your fuse is to big. :O)
The Mobile one oil helps to reduce the cokeing problem, it has a much
higher temperature tolerance than any of the other name brand oils.
Happy flying,
Mark


In a message dated 1/14/2011 4:26:32 P.M. Pacific Standard Time,
jaime.g.sada@gmail.com writes:




Mark:

I have to admit that I had a short circuit in my brain and wrote shock
cooling instead of coke formation, which is the usual type of failure on
turbo's

The usual type of failure with cracked cylinder heads is shock cooling due
to quick descents

Sorry for my typo mistake