If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
Building an experimental? Learn about torsional vibration issues!
Hi Group,
if you're building your own plane AND you're thinking of installing anything but a direct drive engine prop/engine system (i.e. a redrive, drive train, whatever), I urge you to read on: Donald P. Hessenaur - an engineer who worked at companies like Bede, RotorWay, Avian and others - wrote a paper about 'Propeller Drive Systems and Torsional Vibration'. This paper influenced my thinking about what engine/prop choices I have for my RJ.03 IBIS homebuilt aircraft project in a major way. After finding this information on the internet, I reckoned this document deserves a wider audience. I decided to brush up the formatting and take out numerous spelling errors, presumably caused by some OCR process. Other than that, I did _not_ edit the document in any other way. Go to my IBIS homebuilt aircraft project website - http://ibis.experimentals.de/ - go to the dowload section where you'll be able to download "Propeller Drive Systems and Torsional Vibration". Sorry, no direct download link here, due to some intermittent deep-linking issues with my ISP. Download it, read it, study it. Be informed! For my canard project, I've decided to go for a direct drive solution. cheers, Hans _____________________________ My homebuilt aircraft project http://ibis.experimentals.de/ |
#2
|
|||
|
|||
Building an experimental? Learn about torsional vibration issues!
"H_Zwakenberg" wrote go to the dowload section where you'll So, you fixed spelling errors, like you did in this line? I hope not! ;-) g -- Jim in NC |
#3
|
|||
|
|||
Building an experimental? Learn about torsional vibration issues!
H_Zwakenberg wrote: Hi Group, if you're building your own plane AND you're thinking of installing anything but a direct drive engine prop/engine system (i.e. a redrive, drive train, whatever), I urge you to read on: Donald P. Hessenaur - an engineer who worked at companies like Bede, RotorWay, Avian and others - wrote a paper about 'Propeller Drive Systems and Torsional Vibration'. This paper influenced my thinking about what engine/prop choices I have for my RJ.03 IBIS homebuilt aircraft project in a major way. snip Download it, read it, study it. Be informed! For my canard project, I've decided to go for a direct drive solution. If you want the "proven solution" buy a direct drive air cooled aircraft engine with its lawn tractor ignition and induction-attached to a production aluminum or tube-and-rag airframe. If you want to experiment, why experiment with unconventional airframe designs when airframes are way ahead of propulsion systems in this market? We have a conucopia of flying airframe designs to suit most all buyers but relatively few powerplant choices with any substantial demonstrated success rates. In another few years,European autoderivative and other diesels will kill the LyCon export business completely, and third parties will be undercutting Lycoming on parts so badly that Lycoming is probably going to die. The Europeans will probably continue the PFM tradition of not selling to homebuilders. As far as I am concerned there are only two possible powerplants for homebuilts, autoderivative engines with US-based parts support, and the P&WC PT-6 series of turboprops. The Allison 250 I tend to discount because the main versions available tend to be helo variants and making them work in a fixed wing aircraft requires what Soloy did-and Soloy is not in the homebuilt business either. The 331 Garrett and the J-69/Turbomeca centrifugal flow turbojet (Marbore??) are too loud to be allowed on civilian ramps as far as I am concerned. Make no mistake, I will shed no tears at the boarded up windows at 651 Oliver Street. |
#4
|
|||
|
|||
Building an experimental? Learn about torsional vibration issues!
"Bashir Salamati" wrote He was polite enough to post in your language. Shouldn't you use his when flaming him for spelling errors? Vielen Dank, Herr Zwakenberg. Herr Morgans ist ein Idiot, ignorieren ihn bitte. I figured someone wouldn't get it. Bashir, you need to chill, then read up on "emoticans." Notice, I put a wink, and a grin, double, just to make sure nobody missed it. Humor! Get it? If not, get a life! -- Jim in NC |
#5
|
|||
|
|||
Building an experimental? Learn about torsional vibration issues!
Bashir, you need to chill, then read up on "emoticans." sp? I think that is the right spelling; I think it is a made-up word, for e-mails, and such. They are the little smile faces:-) winks;-) and grinsg and surprise:-o and other ones I don't remember. -- Jim in NC |
#6
|
|||
|
|||
Building an experimental? Learn about torsional vibration issues!
"Morgans" wrote:
Bashir, you need to chill, then read up on "emoticans." sp? I think that is the right spelling; "emoticons", I believe. And it gets 5 million google hits versus 4 thousand for the spelling with "a", not that usage on the web is a very good indicator of good spelling! -- Alex -- Replace "nospam" with "mail" to reply by email. Checked infrequently. |
#7
|
|||
|
|||
Building an experimental? Learn about torsional vibration issues!
alexy wrote: "Morgans" wrote: Bashir, you need to chill, then read up on "emoticans." sp? I think that is the right spelling; "emoticons", I believe. And it gets 5 million google hits versus 4 thousand for the spelling with "a", not that usage on the web is a very good indicator of good spelling! -- Alex -- Replace "nospam" with "mail" to reply by email. Checked infrequently. Don't you guiys know that one is required to mispel at least one word in a spelling flame? -- FF |
#8
|
|||
|
|||
Building an experimental? Learn about torsional vibration issues!
"karel" wrote:
wrote in message roups.com... alexy wrote: "Morgans" wrote: Bashir, you need to chill, then read up on "emoticans." sp? I think that is the right spelling; "emoticons", I believe. And it gets 5 million google hits versus 4 thousand for the spelling with "a", not that usage on the web is a very good indicator of good spelling! -- Alex -- Replace "nospam" with "mail" to reply by email. Checked infrequently. Don't you guiys know that one is required to mispel at least one word in a spelling flame? Is that your reason for making 3 errors in a single phrase? }:-) KA I assumed sew. -- Alex -- Replace "nospam" with "mail" to reply by email. Checked infrequently. |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
light twins? | Bellsouth News Server | Home Built | 83 | August 12th 05 02:56 AM |
Homebuilt Aircraft Frequently Asked Questions (FAQ) | Ron Wanttaja | Home Built | 0 | October 2nd 03 03:07 AM |
Homebuilt Aircraft Frequently Asked Questions (FAQ) | Ron Wanttaja | Home Built | 4 | August 7th 03 05:12 AM |
Torsional Vibration Testing | B2431 | Home Built | 8 | July 25th 03 07:15 AM |
Homebuilt Aircraft Frequently-Asked Questions (FAQ) | Ron Wanttaja | Home Built | 0 | July 4th 03 04:50 PM |