Re: KRnet> 0200 Prop

2023-08-28 Thread Larry Flesner via KRnet
On 8/28/2023 6:37 PM, Phillip Matheson via KRnet wrote: Great photo. Thanks. It shows almost all of your temps and pressures as well. Phil. ++ My gauges are never that "on point".  That was blind luck.  I took the photo to r

Re: KRnet> 0200 Prop

2023-08-28 Thread Phillip Matheson via KRnet
Great photo. Thanks. It shows almost all of your temps and pressures as well. Phil. Sent from my iPhone > On 29 Aug 2023, at 08:40, Larry Flesner via KRnet > wrote: > >  > > > On 8/27/2023 10:28 PM, Phillip Matheson via KRnet wrote: >> I had the tach overhauled, ASI checks out >> I’m lo

Re: KRnet> 0200 Prop

2023-08-28 Thread Mark Wegmet
To throw some more math in: Your "actual speed" (120) vs. "theoretical speed" (132) would be 120/132=0.9090909 or 91% efficiency (over simplification): not too bad. Mark W N952MW (res) On 8/27/2023 10:28 PM, Phillip Matheson via KRnet wrote: I had the tach overhauled, ASI checks out I’m

Re: KRnet> 0200 Prop

2023-08-28 Thread John Gotschall via KRnet
> > I have taken to using GPS to measure speed. Direct read on a calm day, opposing passes on a day with wind. jg > -- KRnet mailing list KRnet@list.krnet.org https://list.krnet.org/mailman/listinfo/krnet

Re: KRnet> 0200 Prop

2023-08-28 Thread Phillip Matheson via KRnet
The tack was overhauled, cleaned and hour meter reset to 000. We have checked with a calibrated optical tach that count the RPM. it’s very close at high rpm. Sent from my iPhone > On 28 Aug 2023, at 13:29, Phillip Matheson > wrote: > > I had the tach overhauled, ASI checks out > I’m lookin

Re: KRnet> 0200 Prop

2023-08-27 Thread Phillip Matheson via KRnet
I had the tach overhauled, ASI checks out I’m looking at props and prices. The same male prop, 60 x 68 is around $2700 Aust Your saying 156 mph (135 kts) not a hope My 70 “ pitch gets 120 kts 2300 My prop 60 x 70 p 70 x 2300 x 60 / 12 /5280 = 152 mph. (132 kts) Phil. Sent from my iPhone >

Re: KRnet> 0200 Prop

2023-08-27 Thread MS
I've learned over time doing prop balances that most mechanical tachometers read low at the high end.  The Dynavibe reads out optical RPM and there have been quite a few plane owners surprised to find their engines are turning faster than their tachs have been reporting.  Mike StirewaltKSEE --

Re: KRnet> 0200 Prop

2023-08-27 Thread Larry Flesner via KRnet
On 8/27/2023 4:18 AM, Phillip Matheson via KRnet wrote: FYI I removed my 60 x 70 today and put a 68 x 59 ( too low of a pitch) but gave it a single flight Static, brakes wouldn’t hold but around 2400 Climb 2500 70kts over 1000 rpm WOT over 2750 only 100kts Phil. +

KRnet> 0200 Prop

2023-08-27 Thread Phillip Matheson via KRnet
FYI I removed my 60 x 70 today and put a 68 x 59 ( too low of a pitch) but gave it a single flight Static, brakes wouldn’t hold but around 2400 Climb 2500 70kts over 1000 rpm WOT over 2750 only 100kts Phil. Sent from my iPhone -- KRnet mailing list KRnet@list.krnet.org https://list.krnet.or