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SuperStream

Re: SuperStream

The cruise power settings in section V of the Pilot's operating Handbook. Was trying to figure out how much horsepower as a % you were using. They have power charts for 2400rpm and 2200 rpm. At 2200 rpm the maximum MP listed is 34". Don't know if Commander doesn't want you to use more than 34" at 2200rpm, or they just didn't bother to list it.
 
Re: SuperStream

Allen,
Don't forget that those charts are for the factory installed two blade propeller which had numerous resticted ranges for our birds.

With the change to the three blade Top Prop, those restictions go away and the STC supplement only has low end restrictions. Besides the SB on the prop hub, (that goes away with the three blade), I wanted the flexibility to use the full range of power and rpm that are available. The UBG-16 reports the engine operating normally at these settingsand if I did the math right I'm at 90% power. I've been operating in this manner ever since the three blade was installed in 07.
 
Re: SuperStream

I'll have to try that power combo next time I'm out flying. How long did Jim take to smooth your tail feathers?
 
Re: SuperStream

Steve said:
Allen,
Don't forget that those charts are for the factory installed two blade propeller which had numerous resticted ranges for our birds.

With the change to the three blade Top Prop, those restictions go away and the STC supplement only has low end restrictions. Besides the SB on the prop hub, (that goes away with the three blade), I wanted the flexibility to use the full range of power and rpm that are available. The UBG-16 reports the engine operating normally at these settingsand if I did the math right I'm at 90% power. I've been operating in this manner ever since the three blade was installed in 07.
Click to expand...

Steve,

Are you saying that you lean @ 90% power? Regardless of prop, doesn't the manual restrict leaning when operating above 75% power? I know you're monitoring temps with your EDM. What I'd like to know is how much the SuperStream improved your cruise speed at "normal" power settings (i.e.; 65-75%).

My TAS is consistently 145 kts when I cruise at 34" and 2400 rpm around 12k, so I'd expect a smaller spread than 7-9 kts after the mod with my strong running engine (based on what Bob reported about improved speeds after his recent TO-360 overhaul).

Thanks,

Shane
 
Re: SuperStream

I'm looking at page 5-42 of the POH. cruise setting power chart for 10,000. at 2200RPM as you increase MP every two inches, %HP goes up 4%. Pretty linear. At 34/2200 at 10K, stnd day your getting 67% of rated HP. Add two inches and you add about 4%, so i'm figuring 71% HP. I'd be interested to see if you set 75% hp according to the charts what you'd get in terms of TAS. Depending on temp, you may be able to hit 155 TAS. That would be incredible!!!
 
Re: SuperStream

My TAS is consistently 145 kts when I cruise at 34" and 2400 rpm around 12k, so I'd expect a smaller spread than 7-9 kts after the mod with my strong running engine (based on what Bob reported about improved speeds after his recent TO-360 overhaul).

Thanks,

Shane[/QUOTE]

My TAS is identical to Shanes under the conditions he reported.
 
Re: SuperStream

Allen,
Your correct on the %. I did the calulations wrong. WRT time, It took Jim a little longer than usual as I also had the AD done at his shop and I was competing with the challenges to get the spars certified.

Also, I'll be honest, I wasn't monitoring the TAS 1000 the whole time at FL190 as I was busy with a little weather. On my flights between 6500 and 11.5, I've seen up to 151TAS. For my bird, that is a gain of 7 - 9 knots.

Suffice to say we will all see something different but for me it was well worth it.
 
Re: SuperStream

Steve: That's exactly what's advertised, and quite a difference. With this mod we're closing in on that Vaunted Mooney speed.
 
Re: SuperStream

To my way of thinking the Superstream mod is a very practical way of gaining good speed for a lower dollar outlay - knots return for dollar cost.
I would imagine it would lead to a kinder environment for our elevators also, maybe Jim might like to comment on that aspect.

It is testiment to Robin who went with this one all those years ago, and to Jim who has taken it to an STC,for all of us to benefit from one day.
 
Re: SuperStream

Hi jim and all interested in this thread

I have been wtching this with interest for a couple of years since jim first worked on it

Has anyone done this to a 112A non turbo charged

I consistently get 138 kts out of mine at 4500 ft in still air and have been told this is pretty quick for my bird

I am interesetd in doing this mod jim but would need the rigging done in perth australia so there would be a lot of phone calls etc

What is the process and estimated cost now being most of the posts I see are pre 2011

thanks mick

aircraft is a 112A with the larger fuel tanks

serial number 488
 
Re: SuperStream

Mick,
FWIW, I have the IO-390 so not a real apple to apple comparison to a stock 112. However, I picked up 5-6 knots with the Superstream mod.
Saw 140k IAS yesterday at 5,500 ft., -6*C temps, running 24 square, burning 10.4gph.
Obviously, your results may vary, but it is a nice mod.
 
Re: SuperStream

Hi Mick,

Thanks for your inquiry.

The SuperStream kit cost is USD 4,900. There are three SuperStream Commanders flying in eastern AUS, all installed by Pieter and Ivo Mole at SmartAir, Albury, NSW but I suppose that would be a bit of a hike for you. No problem, the kit can be installed by any good shop.

If it's convenient for you, we can continue our discussion by email. You may respond to me at jrichards@aerodyme.com.

Thanks,
Jim
 
Re: SuperStream

Jim-

I'm looking at getting 38J painted later this year. do you generally recommend doing the superstream first or paint first?
 
Re: SuperStream

Hi Tyler,

Sorry I missed your post at the time.

Generally, we can match all-white empennage quite well. Colors and/or stripes across the fairing area are more challenging, particularly if any metal flake paint is involved. Thus, when a whole airplane repaint is being contemplated, it is preferred to do any structural repairs/mods, such as SuperStream, before the paint job.

Jim
 
Re: SuperStream

I'm new to this forum and in the process of closing on a (new to my wife and I) 1996 114TC, and will be extremely interested in getting the StreamMod completed immediately. Why has this thread gone dormant for nearly two years? Jim are you guys still completing these mods? And if so has the price of the complete mod plus all rigging etc still around the $7,900 price tag?

Jim I believe you are the gentleman that I connected with on LinkedIn the other day, I'll send you an email about this as well.

I'm extremely excited about becoming a new 114TC Commander owner and also becoming a member of this awesome fraternity of Commander owners and COG.

I will be sure to post pictures and let everyone on here know the day it is officially mine, which should be within the next couple weeks or so.

Thanks to COG and all active members.
Todd
 
Re: SuperStream

Hi Todd,

Welcome.

Yes, we continue to offer the SuperStream mod for $7,900 turn-key at Aerodyme.
38 SuperStream Commanders are flying to date.

Jim
 
Re: SuperStream

Just a quick comment to clarify in my own mind: if there is a lot of twist to the elevators in level flight, the Superstream mod will be more beneficial. If there is minimal twist, the advantage of this mod will be less. Do I have this correct?
 
Re: SuperStream

The word "twist" is not the proper description for the issue. Deflection is more like it.

In flight, check to see the amount of deflection between the elevators and the horizontal stabilizer.

The larger the deflection the more you will gain from the superstream fix.

Jim R, correct me if I am wrong.
 
Re: SuperStream

Alex I'm not Jim but you're right - it's elevator deflection that's right.
The angular deflection Up or Down of the elevator relative to the horizontal stabilizer.
Twist in an aircraft sense would imply that the Left & Right parts of the horizontal stabilizer are at different angles of attack relative to the airplane's relative wind.

So yes if your airplane can be made to fly in cruise at your normal cg position with minimal elevator deflection your plane will have lower drag so the Superstream definitely paysoff..
 
Re: SuperStream

The effectiveness, or "need" for the Superstream is dependent on a myriad of different factors. It has very little, if anything, to do with a luck of the draw at the factory. It has more to do with how you typically fly the airplane, what power settings, what altitude, how many pax, baggage, how much fuel you typically carry, etc. It also has to do with the airframe, rigging, VGs, no VGs. There is a range for the correct flap setting, are they at the upper limit, lower limit? The biggest factor would be turbo vs no turbo. A turbocharged, or turbonormalized airplane has a relatively linear perfomance curve (kinda an oxymoron) so the payoff from the Superstream would tend to also be linear. With an NA airplane there is a sweet spot where power vs altitude/DA are best. Any adjustment to the elevator deflection would need to be targeted to that sweet spot. An NA airplane that sees an improvement in performance from the Superstream at low altitude, may see a decrease in performance at higher altitudes.

When Robin first started experimenting with correcting the elevator deflection he was flying a turbonormalized 112 from a 6000ft elevation airport. He, of course, saw a nice improvement in performance.
 
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