X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from sccrmhc11.comcast.net ([204.127.202.55] verified) by logan.com (CommuniGate Pro SMTP 5.0.4) with ESMTP id 892114 for flyrotary@lancaironline.net; Wed, 21 Dec 2005 22:37:44 -0500 Received-SPF: none receiver=logan.com; client-ip=204.127.202.55; envelope-from=kenpowell@comcast.net Received: from smailcenter72.comcast.net ([204.127.205.172]) by comcast.net (sccrmhc11) with SMTP id <20051222033659011005hbq4e>; Thu, 22 Dec 2005 03:36:59 +0000 Received: from [68.51.59.7] by smailcenter72.comcast.net; Thu, 22 Dec 2005 03:36:57 +0000 From: kenpowell@comcast.net To: "Rotary motors in aircraft" Subject: [FlyRotary] Re: Prop program Date: Thu, 22 Dec 2005 03:36:57 +0000 Message-Id: <122220050336.17845.43AA1F59000A74C4000045B5220075043804040A99019F020A05@comcast.net> X-Mailer: AT&T Message Center Version 1 (Aug 4 2005) X-Authenticated-Sender: a2VucG93ZWxsQGNvbWNhc3QubmV0 MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="NextPart_Webmail_9m3u9jl4l_17845_1135222617_0" --NextPart_Webmail_9m3u9jl4l_17845_1135222617_0 Content-Type: multipart/alternative; boundary="NextPart_Webmail_9m3u9jl4l_17845_1135222617_1" --NextPart_Webmail_9m3u9jl4l_17845_1135222617_1 Content-Type: text/plain Content-Transfer-Encoding: 8bit Buly and Jarrett, Take a look at the attached prop program. Ken Powell Bryant, Arkansas 501-847-4721 C150 / RV-4 under construction -------------- Original message -------------- From: Jarrett & Heidi Johnson I'm wondering if there isn't a way to also figure in the forward speed into all of this? These formula's so far will show the tip speed at zero forward speed [ if I've been following this correctly]?? The addition of forward speed may not have a very large impact but it should have some effect shouldn't it? Jarrett Johnson ----- Original Message ----- From: Bulent Aliev To: Rotary motors in aircraft Sent: Wednesday, December 21, 2005 4:14 PM Subject: [FlyRotary] Re: Props Thanks George. my mistake was that i did not convert it to MPH. I was also given the formula for cruise speed: Pitch" x RPM x 60 = MPH 12 x 5280 Buly On Dec 21, 2005, at 4:39 PM, george lendich wrote: Buly, Looking at the formula given by members on this list, 2 out of 3 were spot on with Hoverhawk and the third was close. Examples: 1. Prop Dia x 3.1416x RPM/ 720 - Correct! 2. Prop RPM x Dia x .00436 - Correct ( 3.14/ 720 =.00436) 3. 3.14 x 64 {given prop dia} ( 5500/2.17 {given RPM})= 508346/707 - slightly incorrect ( as compared to the other 3 examples, which include Hoverhawk) i.e 3.14/ 707 = .004809 whereas all the others are 3.14/ 720 = .00436. Now that I have that sorted - can someone tell me how to calculate pitch, easily!! George ( down under) Thanks Perry. This makes me feel much better. Looks like the formulas given to me were not good. Buly On Dec 19, 2005, at 2:00 PM, Perry Casson wrote: I think your math is off a bit - Here's a online calculator http:// www.hoverhawk.com/propspd.html I think 6900 puts a 72" prop close to mach 0.9 but I've never ran mine above 6500 Perry Casson -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ Buly atlasyts@bellsouth.net -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ -- Homepage: http://www.flyrotary.com/ Archive and UnSub: http://mail.lancaironline.net/lists/flyrotary/ Bulent "Buly" Aliev http://home.bellsouth.net/p/s/community.dll?ep=16&ext=1&groupid=164323&ck= No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.1.371 / Virus Database: 267.14.2/208 - Release Date: 12/20/2005 --NextPart_Webmail_9m3u9jl4l_17845_1135222617_1 Content-Type: text/html Content-Transfer-Encoding: 8bit
Buly and Jarrett,
Take a look at the attached prop program.

Ken Powell
Bryant, Arkansas
501-847-4721
C150 / RV-4 under construction
 
-------------- Original message --------------
From: Jarrett & Heidi Johnson <hjjohnson@sasktel.net>
I'm wondering if there isn't a way to also figure in the forward speed into all of this? These formula's so far will show the tip speed at zero forward speed [ if I've been following this correctly]??  The addition of forward speed may not have a very large impact but it should have some effect shouldn't it?
 
Jarrett Johnson
----- Original Message -----
Sent: Wednesday, December 21, 2005 4:14 PM
Subject: [FlyRotary] Re: Props

Thanks George. my mistake was that i did not convert it to MPH.
I was also given the formula for cruise speed:

Pitch" x RPM x 60  = MPH
       12 x 5280

Buly
On Dec 21, 2005, at 4:39 PM, george lendich wrote:

Buly,
Looking at the formula given by members on this list, 2 out of 3 were spot
on with Hoverhawk and the third was close.

Examples:
1. Prop Dia x 3.1416x RPM/ 720 - Correct!

2. Prop RPM x Dia x .00436 - Correct ( 3.14/ 720 =.00436)

3. 3.14 x 64 {given prop dia} ( 5500/2.17 {given RPM})= 508346/707 -
slightly incorrect ( as compared to the other 3 examples, which include
Hoverhawk)

i.e 3.14/ 707 = .004809 whereas all the others are 3.14/ 720 = .00436.

Now that I have that sorted - can someone tell me how to calculate pitch,
easily!!
George ( down under)


Thanks Perry. This makes me feel much better. Looks like the formulas
given to me were not good.
Buly
On Dec 19, 2005, at 2:00 PM, Perry Casson wrote:

I think your math is off a bit - Here's a online calculator http://
www.hoverhawk.com/propspd.html

I think 6900 puts a 72" prop close to  mach 0.9 but I've never ran
mine above 6500

Perry Casson



--

Buly




--




--


No virus found in this incoming message.
Checked by AVG Free Edition.
Version: 7.1.371 / Virus Database: 267.14.2/208 - Release Date: 12/20/2005
--NextPart_Webmail_9m3u9jl4l_17845_1135222617_1-- --NextPart_Webmail_9m3u9jl4l_17845_1135222617_0 Content-Type: application/x-tar; name="ED-DOKUS.ZIP" Content-Transfer-Encoding: base64 UEsDBBQAAAAIAEs5dih8WGWg/Q8AAIgyAAAMAAAARUQtRE9LVVMuQkFTpVv/b9u4kv9dfwXr9iF2 G9sk9cVSen2FYtG2XhRJkeh0c4c94O22D7fA7i3Q7S8P2D/+ZkhKJGUnTfYMRKLImc8Mh9+GQyYI GCUXAadkW/VBSMmNeCDNbndFqmabS0EYvSSMBRElbVfWkszIuV/bNa2oKtGRQvTlviazIKYjBAMI GiRPQww4+y6/VelZsHkGh/ubBakVGiqh2fMgrh9GCEYtRqQwGPseiCg+lTXJV6Robo49gnALEmuQ 8PuaiDwnMYtCrhWJLEaqMeIRo+zJQ3Ps9CeYvak/Asdg4oCB6ZqaiK5rOrJvZEM4BX40jwbYHro3 c75ZvCczMbs6k7ufXZBO3JIi72406PuiOV5XopddeSMClp3Dqmfv9We8uPCqhlD9TdmSmFRlLXqS S9KKbtd0uSybug9AP1LuQOOKfCCoqDyImnAwvah6QTinAX5cC9FeDUYYKg/GaHa7V69eQU10ZUOg dppAme/qKfvPAuAhRXlL5Dymi0tS6Nd9p9/bQ9ONWVQnKv2606/2UI4JRRDwyCAehMx12Y1+GdDr MV8ezLszaNVu0KPbm4TUoLEG/aHIDcXDmJKVJknAek1RgCGh0lLcgyFVshgzC5t5N2beDZkB3wCC zizxRZ78XciuzCuybY7YGgGHxmuRLVyxiCUBz6Bl6/YIls+rqvlEoNGJLFtonb4n5GFdg/nfg/Jv glB3AkgC++xhRpBSf/x7pntEOPSIkNMAPwZi0c/GFtYfqiuEIZDxkaxuLBWkAygelBOqL9XNijQ7 cl3lhehXoJdOGSag5wP7JgZtd99WBPtf3uIUCHaQQtVvE/+NtM0n0a1mI2s0EZVXspTHQlxuu2PZ i0vAAnmQe6WsOhZP7b37FoQxJd2hgRqtKOVhSpYkWSViSVPyFhGmLZSXODPXfSkfLklfHff9enu8 LrcKK1GTPxnsMnkHoTMNswVhEU1nl2TGMckoJkOV5JiMFoQbghiTQBCE6QDgzwkv+UEFgtBO5onC VhI3KhljMlVJJTzDJGeYZFSlo5mWvmvKqg8iOkyVkZ3dGVQvMrCMq7TCZaFKK2AWYdogxyodzYKI 04n1ZnW+zRUC+eUP8scvv/3y6z+/km+/g6lxRn0Yu0Vke2AvKrGVWFdUksiGXAty7EWB/QJ0jtSk 3pN90x+vSZTQSxJt8JHiI4NHTPGBa3bM8RHiI8JHjA/kiJEjRo4YORJKgyimerAkDD4SOmigRoxq 7ytQm2JvY5hKcYqGRKEz01WmfmJJQ8y9LWvdMdMUP1P1waGoE/LY1QHoPJHA6BkJq8yKALAs8rCz 0GKzTWzB0xNw7oDHFh2ZXPzUx9fFRkBq8TMfn3vm4aN5VtSHT7PMt43+NsaJRnycVHx81zgW/5WL znzVXc0zi8xOkB3L8PhZ0E6LulaP+Ql2fEbrVeYZhVGvTRnlDnrioIcn6K7NnTb10RMf3TWLix5N 0Tlze4zVPvXglVwL7+jOUfKAHp+gR2f7ow/uDSTG3YHk9JXJUI28Fo1sX2S+2ZmvudukFnsySCOv RV3sp6B1Exjw2LH5ZJRGXouGsTOMQt/oHjxzm9TRfTJGI69Fw8d64xMNykfsZDI+I689+eax9vQb NHTB7cyYMEpuIXOOGEsEXZA1SYOEUzL1HdpDrjZbnSgu50uGq8W7dFGI/YoQeknkQ1tu80o5FEAa JCGu8oCNKr0DKW8NxqNe3bYRu125LUEgekRVuZNBEqFr2QJM1ezn+XU/n2M1lrpuqOxcV3rIWSyC JKbkupEej1s9fAFVQknNgAjh18gQJNgFmTLHRAaCWIwF+W9gDZIUaoiurLbzO+R9O9B6pI/UsOjy fZBg31GG+WDeb9GbXas9yVk75fW+EsifS5lvb/R2Jy/KvO6DjXZobxx/9sZzZzNGgw2bOoZlt+3y ncRGFMon3L4BqtHzPPZCOZggU9T7shbk0BLcSNX70a3Y8Anoob0k2tEEwMO4iZpUZsBrul4o/3Xw Pg8tQHoa3OY/rFCqKEjX3l4SjpVF37d62DbQAnvr+m6mXrZiGLWBr3PqXKBLTbpGqi1iXpG+FaK4 RHJAnOqiS3FfqR1zSfK6UAVAbzU5ccLLTsMaJ/y2PaDF7z2FLkaqaesDeQDyfEwUihsczbL7tu7F lsxTSi/NqFzgfqfX9bOERFMGm8Q6k9oxd2Mx8ehhGnexrfIazD7WcXTcN5P4CVvgPnwr83p/rPJO 72lnwSb1yTiQybwVHVhzIJmEUUIgEVVVthJrM1Clo0+dWp9aW0TVdFB0mLbQzldEMrXlTMf+2lb1 rru9QldXJ42/m6ILm6L3mmZAr7brOc6Wssc5oS3JW2zqBbwSekU6KFEEa8Jxw1vJHLM6+I6pNj0W ryZNuvsWpJFxh3Fwphhz0VO9azyzmVBxDVV93ARum7oHAqg/tKCZ0tON5feteuV3Glm26wNUU6Op sAj2EnZFLlAIRk2gAgoiSFOLn1l82ySDelrBIV9z40rxn6JrVkFGRxioqpH8gaxi8r3fxa7sekn2 R4Fb+In9MhNNzML/bxwii/SMooMQoHcMebGaUk3X+ECYmUhTKEr8Im6KMija+EWhLmKUQllq6j4v F7h8YNJEDxjFGGJ2Wo4ri2TkHZkzsoRWwl6nkh0SrUm3WLgQKOccRn/XKa55qbolLk98wggNU4sf JCkhDYZtbsU+V3VT65Lq8sCbIGnoRU9EPxsqGZuYCaMR0uEiXmlbG0mKPTbZOuIB0NsKH0rrMFW1 CpB0bBJmmoRRjBdVumoSmQYrQFHq6J/psJIEuzFvVuN2Vts2t+1RT/mkrHVEWPT9qxnGYW1Ij3tM JmqjAlE9+YADB8jZGVUxMttpTdF6el6AbLDdvcnHRpmzVZQkQHCv2gQbWlte1003FLBhXPxQar5c 1pYNpySPA6nBwjea1tp46BTK3GuSwp/yN5AJWBJq4oejiPmNUmBN+rKea+EKfEN16FERGqXejcxA kFIdcRwIqKbQ/iHDgC6GNlWpNgWo1PTzAWGBUW1oAE3BcF7Fuh0aePpdZq5xtOW8KurRghAmPvy5 Wn/+CsDQVMXTwMXjwF5Y6XOhEaGd7zTivLCVMdXGelc611hR5S5MYxnAz3frzx1A4TymoaozSEtS nCINCFIjRHYQYADX65VRRnopWoJRfz9Adi32ZQ2wt23f1Bc96Y6VAICEDpOler1T9YT8jSMktUK4 EpIaIVAGDT1Msfo9IGD4dUBQodWmuzsKtODdnKHJIqilkYn2t9wxVbYzq+yahACAITH0IIF/GAga EMpCU6b2Q4cWimIcnBgi3WHnVHzrgQYK9KS/I/9BVlmmp7VhudLvNdmZ2SwLESkxDH/HPSR7Dsfm sXaBsnRcyaSuvtQGy6zBIvq4yTHGOKx/0hhNI2DgcETAfnbojj3OkXNpTS6tyS33icmx74i6OOkv GDas1V56mJreDmIcC0fTbhnjmn0wc7ru4FrWlTqlUPl3fj4eWrjDZJhcMaSI5xiqrPB5CnlGBLA4 nRlDeuhPsGh6mudtlJbw03ulwQFmMR0ZtHs/uvtIvMRjh/v3ZKZ8fqBmJ9QmBD9SQwbQ74SQioFP GZQ5l+ZH1EYL6A+tog6n1F17u1y61JAB5PBU9NF4mhfHj6zsGKXRK3uMSzgGhOxBR6CKjcjxwKWs txVUqfhoDl2ssew+oP7dOQRx9NMZQGobYnDql84PSdvqDZ5Har3N+LOqTD1dxSIZcNg2UC76EAvH KDgiq0Yw4Regtg2gVrGl/yND9IO8Vdt3XFnBvhgjwcNSbI9Sbg+eN6U8nbdE5vVcLZbwid+MX4Dh Dlj5xJ6FK/YzQlU+SNIsSljEPSY8FPj65V9fvn7535+/fMZzgZ9+/efnL+Sn3799+/03ZLBnvWqb ckaK2t2gar4ke84+GnnCOHifU07bW8J1pGIYx94CICfjrkfoc9vuo2eXU4V1PnBVP/2hWGw3GgIx 2wefpUY1KQWevyGHiqfoXVPR4Ak4+ZQDe65hls1RfkTzd2+AlGmPv3NiL+ZjCL5o5zfF2d8Jl/jA Vdmr4FCbd/mtkKLryX0/2EYdXmJLoLwxOtK3+Va8mW/oAnK1T144ShQTHXBvy9k4kDe4EG6GLSin G/yMz2oH5bJ7IHndAFQ37q8/Kr3UGKxRsfisYuNeybWP+RqUk84mYYMTDIYUjCLkCU3MCP1o9LhB LTZntUi/Ex/TZ7hKdPZIC9XiE+mO9UdcEOYgEIMrqgNk5ySmekoae4WSAuzqzgBLmVP675NSTk8D Mpw69xH07RUputuyxsjYpdlfiwJNVDQ9xsREXQTY605uaODmDIMP1YsWOYxQVM9f5TA2MSV/epnD EMaE46l1Lk1PyJ9e6NLxKgneKrHMZ5ascc0a6Zml/96qhXGJ6vmLC4Yvqueschil0Kvc34m5t+JU 4dGlLnPa7eWrV+Y04/OXoSzhluuXbz//z3fXocxp/JctRJnTD164EmX2ctFfWIo4dTvR89YiTp2O 9LzFiFPbn8YOyTEIo9eVDV5ZopF3rSka7jWNIRlkCNSnd7WJTO82DfdZ0AkGemj9C/0db/AbWukC l6qy3pOuOcJbQK5xnDkGXvScpi0JYPfq809I6Sn/9evXq9evZ3jJaliUZX49jxc4mb5XaU4XOPqE +Yzw8374cAkTZggBjU3RDtKFq+7lo3AjpcJDSsDjepvyj2Gbktrpd6niyWrX8A+gDJ0NjSJFQ7No qs/AfuzRdjWIVFerSqdo1PaU9uEc7ViVq8DJfEoY7u5cAWOtH5OoGaA+8bhP4hgrcroeuhTeapVc EjwknZweDH6NjcoDq71HmXpMhJD/Yj/CE08DyfI5P4TLRrjsBI4jHB69nQSZ/5zhJT7qnX74vCHy mr3sGV7mX0H1eSPFqyMcw68o8Xbj9RGDjwjgXCHkJwCxFi7k9Ay1FR0yh/5dVJ85+VHFd6a80Ca3 eBqJ9xG5c/8zOgHYIEB7KMnJr9kNNxq5cwc3PkFIDQKd8A++rUJILILffRAhQ4T7r+T09+d4qxKj UgPC5rQv0R8RYaqCj+Bc6j3TG7E76mXkcQTb/9hpB2TYA/Wm7LkdOnRiPWOwxEwbkGWCp3iDQI/N K5zLcJbVaxQijGe+/ZV7qYuHeFuLh7F6Juq5Uc9UPfHKFo+oeirvM+LqGaqn4o1iCvh8PNrhGG0b 0yr2L5QyOIaXePn3XivXNse6wLXhpGoPY9V0iMfWa8SNLS4O5pfi6vDQGdzE4pql/KXIjyi8cYDV LOAC75pGLp+DrkNhZ+BTV28hcxe9EPtOiO8hD1F/6/2dEZNZMdd/Rcr1M4RgZHMQ0h7KF8swZxFP imCeCPpXZNDvCuFWyP1Xr7mFUNfRSS+2q6cFqZORM9ihi+3p/yJweh7dGbXaCXbwzZzyJLBzBOPO SiO+M3r1ZuKF+E78rPTCZ+XiUZmJ+scTDPReBMH/AVBLAQIUABQAAAAIAEs5dih8WGWg/Q8AAIgy AAAMAAAAAAAAAAEAIAAAAAAAAABFRC1ET0tVUy5CQVNQSwUGAAAAAAEAAQA6AAAAJxAAAAAA --NextPart_Webmail_9m3u9jl4l_17845_1135222617_0--