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Search: Posts Made By: lesdoud
Forum: Probable Cause Documents Discussed 10-14-2015, 11:17 AM
Replies: 20
Views: 36,743
Posted By lesdoud
We're looking into it.

The RV-8 accident NTSB Probable Cause Report involving a pitch change knob failure was brought to our attention two weeks after the report was released. Hartzell did not participate in the...
Forum: RV Ongoing Maintenance Issues 12-18-2013, 11:54 AM
Replies: 26
Views: 7,686
Posted By lesdoud
Blade Pre-Load

Based on the description of blade free-play, it sounds like a loose pre-load screw/plate. As mentioned already, the only way to correct the problem and rule out other more serious causes is to open...
Forum: Traditional Aircraft Engines 11-04-2013, 05:28 PM
Replies: 2
Views: 1,456
Posted By lesdoud
Check the prop TCDS

Check the propeller Type Certificate Data Sheet. In this case is is TCDS P-920. Just Google "FAA TCDS P-920" and you should be able to find it. Or go to the FAA "RGL" Regulatory and Guidance...
Forum: Electronic Ignition Systems 10-28-2013, 06:33 PM
Replies: 9
Views: 2,923
Posted By lesdoud
I forgot to answer the first question!

Yes, the resonant torsional frequencies are normally dictated by the basic crankshaft configuration. The most common modes on these engines are at frequencies of 6X, 8X, and 10X RPM. All the other...
Forum: Electronic Ignition Systems 10-28-2013, 06:23 PM
Replies: 9
Views: 2,923
Posted By lesdoud
We've tested some EI systems

This is a very complex question. It's not complex from a technical standpoint, it's complex due to the "web" of possible configurations and the reality that we cannot test them all. What engine? ...
Forum: California 10-23-2013, 08:40 PM
Replies: 24
Views: 4,467
Posted By lesdoud
Things have change since I was there but...

I worked for Northrop during the 1990s primarily at Edwards AFB and some at the Hawthorne plant. At the time we were living in Tehachapi and I commuted by car (ugh) and airplane sometimes. ...
Forum: RV-10 08-11-2013, 08:41 PM
Replies: 10
Views: 3,629
Posted By lesdoud
Prop Model?

Yes, the engine and prop are an approved combination assuming you are running stock pistons and magnetos.

What is your propeller model, HC-C2YR-1BFP/F8068D-2?

The advice on getting a spectrum is...
Forum: Propellers 09-19-2012, 12:10 PM
Replies: 13
Views: 3,556
Posted By lesdoud
Low Pitch Stop

Yes, setting the low pitch stop properly is the best way to prevent or minimize RPM overshoots during max power static/takeoff conditions. I normally set the low pitch stop for 25-50 RPM below rated...
Forum: RV-10 06-19-2012, 06:57 AM
Replies: 13
Views: 5,716
Posted By lesdoud
Hartzell Service Letter 277

Charlie,

Hartzell has written governor installation instructions that are provided in Hartzell Service Letter HC-SL-61-277. This is available on our website at...
Forum: RV General Discussion/News 06-02-2011, 09:57 AM
Replies: 8
Views: 2,974
Posted By lesdoud
Probably not

Paul,

Like others here have said, I don't believe you are experiencing a propeller blade resonance issue, especially with the 7497 blade. The only blade vibratory mode that is sometimes felt/heard...
Forum: RV General Discussion/News 04-29-2011, 01:01 PM
Replies: 4
Views: 3,683
Posted By lesdoud
7497 approved on IO-360-M1B

Steve,

Yes, the 7497 is approved on the stock IO-360-M1B without any restrictions. This is one of a few configurations that is not yet in Note 9 of TCDS P-920. We approved it with the LSE Plasma...
Forum: Propellers 01-28-2011, 11:52 AM
Replies: 3
Views: 3,096
Posted By lesdoud
Hartzell governor

Bob,

Yes, we have the S-1-32 governor that is smaller and lighter than our older models. The "S-1" series has been STC'd on Diamond DA-40s and Piper Malibu/Matrix as well as OEM aircraft with good...
Forum: Traditional Aircraft Engines 03-31-2010, 12:37 PM
Replies: 14
Views: 9,787
Posted By lesdoud
Hartzell installation instructions

Chris,

We provided Vans installation instructions for our governor that are dependent on the aircraft model. It sounds like you are missing those instructions?

Please e-mail me directly at...
Forum: Propellers 02-05-2010, 11:57 AM
Replies: 17
Views: 4,503
Posted By lesdoud
I'll ask

Guys,

I'm in San Bernardino at the moment. I'll ask our Vibration Engineer as soon as practical if we can publish this somehow? It may not be until next week when I return to Piqua. Since the...
Forum: Propellers 05-10-2009, 07:40 AM
Replies: 8
Views: 1,858
Posted By lesdoud
Bird strike testing

Bird strike testing on composite props has been a "special condition" for certification of composite props. I believe it is now baked-into the new amendment of Part 35. The concern is based on a...
Forum: Propellers 03-14-2009, 10:00 AM
Replies: 13
Views: 4,266
Posted By lesdoud
Call Hartzell Product Support

Brian,

Please call Hartzell Product Support at 1-800-942-7767 before you pull the prop on Monday. John or Rolf should be able to help. Also e-mail the pictures to them at...
Forum: Propellers 10-09-2007, 06:14 PM
Replies: 82
Views: 44,092
Posted By lesdoud
More opinions

I'll try to address a few questions people have asked me directly:

I can't speak for Lycoming regarding approval of specific prop/crank indexes, but I feel they should be consulted before anybody...
Forum: Propellers 09-10-2007, 05:46 PM
Replies: 82
Views: 44,092
Posted By lesdoud
First of all, thanks to Mike for doing a great...

First of all, thanks to Mike for doing a great job on collecting the data and correlating his subjective comments to real numbers; it is extremely valuable information to me. Cabin vibration is so...
Forum: Propellers 12-17-2006, 08:44 PM
Replies: 31
Views: 6,515
Posted By lesdoud
Prop servo oil pressure/leakage

All,

Here is my understanding of the problem as I've seen it before...

The props on your airplanes are what we call "single-acting." Oil pressure from the governor works in one direction; oil...
Forum: Propellers 11-27-2006, 08:13 PM
Replies: 12
Views: 3,039
Posted By lesdoud
Hartzell spinners

CJ,

Yes, we do have some spinners that have been sold to RV builders. However, our spinner diameters may not be identical to the RV fiberglass model. I can check our database tomorrow to find out...
Forum: Propellers 09-19-2006, 05:25 PM
Replies: 4
Views: 15,184
Posted By lesdoud
Please, don't shoot!

George et al,

I believe you are correct. The details are in the AD (available on the FAA website) and in our Service Bulletin HC-SB-61-269 (available from our website in the Resource Library,...
Forum: Propellers 09-11-2006, 03:07 PM
Replies: 2
Views: 1,796
Posted By lesdoud
A & B suffix hubs

Folks,

You can always call our Product Support (1-800-942-7767) and ask if you're unsure if this AD applies to you. There is also additional information on our website...
Forum: Propellers 09-07-2006, 11:12 AM
Replies: 2
Views: 2,784
Posted By lesdoud
TCDS P-920

Yes Dan, TCDS P-920 is what everyone should follow if the combination is not in the list I posted. The TCDS is correct. My list includes what we've either tested recently and is not yet in P-920,...
Forum: Propellers 09-06-2006, 09:03 PM
Replies: 2
Views: 2,784
Posted By lesdoud
Hartzell Propeller approval summary

I'm sorry folks, this list started as an easy-to-read MS Word table but it would not cut-n-paste into this message and I cannot attach a document, so I had to resort to a simple, sequential list. ...
Forum: Propellers 09-01-2006, 04:32 PM
Replies: 56
Views: 12,760
Posted By lesdoud
Which diameter?

This is another good question and in my opinion it probably comes down to personal preference after considering what Vans recommends. The larger diameter will generate slightly more thrust at lower...
Forum: Propellers 08-25-2006, 05:26 PM
Replies: 56
Views: 12,760
Posted By lesdoud
Prop Restrictions/Placards

Folks,

Its become obvious to me that I need to summarize our approvals and placards in some tabular, easy-to-read format that could supplement what Vans provides or help others make a purchasing...
Forum: Propellers 08-24-2006, 05:43 PM
Replies: 56
Views: 12,760
Posted By lesdoud
Some more history

The 7496 and 7497 are my designs so I may be able to add a little history to the discussion. First of all, I'm glad this forum is discussing the restrictions and/or placards, awareness of placards...
Forum: Propellers 08-23-2006, 05:02 PM
Replies: 56
Views: 12,760
Posted By lesdoud
You all make some great points

You all make some good points and ask some good questions.

Regarding why certify for experimentals? That is an excellent question. Like many things in life, there are pros and cons. I could make...
Forum: Propellers 08-18-2006, 10:55 PM
Replies: 56
Views: 12,760
Posted By lesdoud
My pleasure folks

I will get more from these forums than I could possibly give so it's my pleasure if I can contribute something.

I would love to say, "sure, 5 more knots, no problem..." but I can't. Analytically...
Forum: Propellers 08-17-2006, 08:51 PM
Replies: 56
Views: 12,760
Posted By lesdoud
Advanced Structural Composite II (ASCII) Blades from Hartzell

All,

Yes, Hartzell announced the new composite blades at Oshkosh this year.

The new composite blade was designed for a 3-blade assembly intended for 300 Hp applications, thus the new prop on the...
Forum: Propellers 08-15-2006, 11:48 AM
Replies: 56
Views: 12,760
Posted By lesdoud
Hartzell "BA" 7497 propeller

All,

I would like to clarify some info here. I offer this info as an engineer (I'm not a salesman) and I'm building an RV myself...

Dan is correct, the new "BA" 7497 prop is approved on the 200 Hp...
Forum: Propellers 07-21-2006, 07:37 PM
Replies: 4
Views: 2,537
Posted By lesdoud
Correction

Jim,

Please forgive me for the reply posted earlier. I had it backwards becasue I was thinking in the feathering/racing prop mode. For the pressure-to-increase pitch props we sell to Vans, the...
Showing results 1 to 32 of 32

 
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