: -------------- Hi Guys... Just to add some data to the conversation. I run a Ivo prop and switch between two different blade designs. Both are 76" dia and both are set up for inflight adjustability. facts. my ignition has 4400 rpm chips in them. redrive ratio is 1.43-1. I usually run 4400 engine rpm on take off and climb. this gives a prop rpm of 3076 and at 50f temp that works out to tip speed of 695.5 and .922 mach. Prop pulls real strong at this rpm, anything over that and it starts to lay down. It appears my Ivo is pretty effecient till about .94 or so. I have not had the balls to pull the chips out and take it to 1.0 mach but... On this pass. http://www.youtube.com/watch?v=AOF6eT6FRmY the motor was just under the chip rpm or about 4350 or so. temp was 26f, prop rpm around 3000, close to mach .93. The plane pulls good and as you can hear the motor makes alot more noise then the prop does. I have several guys tell me no way that I can run the prop that fast but proof is hard to deny. Ben www.haaspowerair.com --NextPart_Webmail_9m3u9jl4l_3583_1255869095_0 Content-Type: multipart/related; boundary="NextPart_Webmail_9m3u9jl4l_3583_1255869095_1" --NextPart_Webmail_9m3u9jl4l_3583_1255869095_1 Content-Type: text/html; charset="utf-8" Content-Transfer-Encoding: quoted-printable

Stephen,

Impressive !!..................Love the V-8 sound..= .............I presume you have both

the "Ivo" 30 to 90 and 45 to 90 pitch blades..............With your hp= I would also

presume the 45 to 90 are needed to hold back all that hp..............= ...I also have the

electric "Ivo" (74", 30 to 90 pitch , 3 blades) for my estimated 180 h= p 13B that has

yet to be run................Several of the Rotary group are currently= flying both ahead

(and behind) the "Ivo" with varying blade lengths...............From y= our experience

with both pitch blades and with the ability to overpower them at will = with shear brute

hp do you think that I will need the higher pitch 45 to 90 blades for = my approx 180

hp 13B ??.................

Thanks,

--
Kelly Troyer
"Dyke Delta"_1= 3B ROTARY Engine
"RWS"_RD1C/EC2/EM2
"Mistral"_Backplate/Oil Manifol= d

-------------- Original message from stephen haas <admin@= haaspowerair.com>: --------------

Hi Guys... Just to add some data to the conversation.

I run a Ivo prop and switch between two different blade designs. = Both are 76" dia and both are set up for inflight adjustability.

facts.

my ignition has 4400 rpm chips in them. redrive ratio is 1.43-1. I usu= ally run 4400 engine rpm on take off and climb. this gives a prop rpm of 30= 76 and at 50f temp that works out to tip speed of 695.5 and .922 mach. Prop= pulls real strong at this rpm, anything over that and it starts to lay dow= n. It appears my Ivo is pretty effecient till about .94 or so. I have not h= ad the balls to pull the chips out and take it to 1.0 mach but...=

On this pass. http://www.youtube.com/watch?v=3DAOF6eT6FRmY

the motor was just under the chip rpm or about 4350 or so. temp was 26= f, prop rpm around 3000, close to mach .93. The plane pul= ls good and as you can hear the motor makes alot more noise then the prop d= oes. I have several guys tell me no way that I can run the prop that fast b= ut proof is hard to deny.

Ben

www.haaspowerair.com
<= BR>

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