Just MT Propeller

[goobermax]

I have a quinti prop with warp drive blades that thus far (only 3.5 hr one my RV-6A) are not performing well. I may be able to get better performance after some tweeking but I doubt it. Is this prop for sale? How much?

[BloomerJohn]

I just changed from a Sterba 68x78 prop to a MT 72x68 prop. On the day of the swap, we did a complete set of thrust and flight test evaluations of both on the same plane, same day, at MGW.

Here are the findings:
......................................Sterba...... ....MT
Static thrust:...................360 lbs 2400...422 lbs 2350 rpm
Climb Perf (1500msl to 7000')..799 fpm.......776 fpm overall average
Cruise: 3000 msl...................177 TAS.......199!! TAS
..........6000 msl...................188 TAS......191 TAS
...........8000 msl..................181 TAS........179 TAS

Vibration is no difference...smooth on both.
The MT runs WOT at 2650 and is very resistant to overspeed. The Sterba ran 2700+ and you had to watch for over-speed.

I can not believe the increased IAS at low altitudes with the MT!!. It is easy to run in the yellow arc of airspeed with RPM never going over 2650.

The MT is much finer, more professional construction with a stainless steel leading edge and PU strip near the blade roots. Price of the MT is a bit less than a Sensenich.

Now for the questions:
My plane is a 1994 RV-6 with 160HP Lyc O-320. Viscous dampner is installed in front of flywheel.
1. Is there a 'preferred' index position reletive to TDC Cyl #1 on the flange?
2. Does anyone want to make me an offer for my Sterba 68x78 prop?

Thank you.
John Nielsen
e-mail: Nielsen(at)Bloomer.net

[RVjim]

MT Propeller has a new propeller blade tip color available. The blade tip can be ordered with a Red, White and Blue striped blade tip at the standard price.
On a Gloss White blade, the blade tip would consist of the standard 4? wide red strip, the 3/8? wide white strip and a 3/8? wide blue strip.

This new blade tip color has been added at the request of a F-1 Rocket builder in the USA. I thought it might be of interest to someone else in the USA.

MT Propeller has five standard colors available for the blades and spinner:
White, Red, Black, Yellow and Grey.

Typical combinations of these colors that work very well consist of the following:

White blade with Red tips. Pretty much a MT Propeller standard blade color.

Dull Grey blades with Gloss White tips. Recommended blade colors for aircraft planning to fly IFR. Rain will erode the Dull Grey top coat of paint over time. This exposes the Dull Grey primer color underneath. It?s an appearance thing.

Gloss Black blades with Gloss Yellow tips. This is the old CAA required blade color for all propeller blades for visibility of the propeller when it is turning.

Again, there is no extra cost to the customer when choosing from these standard colors.

Regards,
Jim Ayers
Less Drag Products, Inc. - Located in California (805) 795-5377
Custom Aircraft Propeller - Located in Florida (321) 441-3544

[RVjim]

If you even think you are going to be doing any aerobatics in your RV, give some serious consideration to getting a counterweighted blade propeller.

I say this because I really don't like selling counterweighted blade propellers to new customers after they have over-sped the existing propeller due to a momentary loss of engine oil pressure.

Over-speeding the engine and propeller is very expensive. It normally scraps the propeller and requires an engine tear down inspection.
For the engine tear down inspection and new propeller, we're talking about something like $20,000 on top of what was already spent for the original engine/propeller installation.

The extra expense of the counterweighted blade propeller is like buying an insurance policy that is always working for you.

The counterweighted blade propeller goes to course pitch when oil pressure is lost, so the engine RPM decreases. This is how the counterweighted blade propeller protects the engine and propeller in the event of oil pressure loss.

In the event of an engine failure with no oil pressure, the counterweighted blade propeller automatically goes to the course pitch. This reduces propeller drag by about 63% and increases the gliding distance of a CS propeller RV significantly.

Regards,
Jim Ayers

[RVjim]

This aircraft had an aluminum counterweighted 2 blade CS propeller.

The owner had one basic requirement for a new propeller.
His Lyc. 180 hp. powered aircraft was just a little faster than his sons Harmon Rocket 2. He wanted a new propeller, but he still had to be a little faster than his sons HR2.

The conventional opinion is that a 2 blade propeller is faster than a 3 blade propeller. But I proposed a 3 blade propeller because the customer had mentioned a concern about vibration at 2500 RPM and below.

There is no market for this particular 3 blade propeller. There is only one of these aircraft in existance. However, this is exactly why I named the sales office of Less Drag Products, Inc. - Custom Aircraft Propeller.

This propeller was sold at the standard list price for this type of propeller. Even though it was has custom designed blades.

The bottom line. This aircraft with the 3 blade MT Propeller is still a little bit faster than his sons HR2.

The aircraft. Pirahna.
A one of a kind prototype COIN fighter from the late 1960's.
So it's not an RV. Stall speed around 120 mph.

Regards,
Jim Ayers

[ratc]

Hi RVjim/Brian Vickers,
PM sent. Thanks in advance.