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mccarthy(at)jefnet.com
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 Posted: Tue Nov 30, 2010 7:21 am Post subject: Slingshot thrust line/angle/HKS |
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I completed the installation of the new 72" 3 blade Warp drive prop last week and was able to get about 2.5 hours of flying in over the weekend. Daryl recommended 13 or 14 degree initial pitch, I set it for 13, which had the motor at red line(6200 two minute) on full climb. The overall impression I got was very positive, climb was around 900-1000fpm+ and the max continuos speed was around 80, but this was on a non standard day, about 40 degrees F. I believe resetting the prop to 14 degrees will give me a better cruise and only take away a little climb. A few surprises I encountered were how much smoother the longer prop was and even felt quieter overall. Also the higher thrust line required by turning the gear box around had no ill affects on the stick pressure at higher RPM's.
Just a couple more notes for the record. The ridiculous claims of fuel burn in the 2.25-2.5GPH are exactly what I am getting. I'm not sure I'll be able to fly off a tank (10 gal. usable) in one sitting, but look forward to trying.
I forgot to mention this earlier, but the motor came with a MGL engine monitor included, and was found to be very inaccurate for RPM's. I installed a tiny tach and verified it with a hand held digital tach to find that the MGL reads 500RPM,s too high, and changing the program one step causes it to read 300 rpm's low, so moral of the story might be to verify your tach.
My next order of business is to get heat to the cockpit for winter flying, which should not be too hard with the oil cooler mounted above the rear seat area. For those of you that have not landed on frozen lakes, it can be quite fun.
Another 1st for me was winterizing and folding up the Firestar for storage. My hanger is too small to leave all three together. If you know anyone interested in a nice Firestar & trailer, feel free to email me. I'll probably advertise it in the spring.
My work has finally slowed to a crawl, just in time for the winter. I am hoping to do some visiting down in Texas and SW Florida in the upcoming months, trying to find retirement properties and visit family, but mostly try to avoid cold and snow.
| Quote: | | Tom McCarthy N514 TM Zenith 601HD N414 TM Kolb Firestar N863 GB Kolb Slingshot |
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Jimmy Young
Joined: 24 Nov 2007
Posts: 182
Location: Missouri City, TX
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| Posted: Tue Nov 30, 2010 9:13 am Post subject: Re: Slingshot thrust line/angle/HKS |
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| Quote: | | The overall impression I got was very positive, climb was around 900-1000fpm+ and the max continuos speed was around 80, but this was on a non standard day, about 40 degrees F. |
Tom,
That sounds like pretty good performance. I only get a climb rate of about 6-700 fpm on the Firestar, but that's enough for me to safely fly around here in the flatlands.
Do you have the 3.47 - 1 gearbox or the 2.58?
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Jimmy Young
Missouri City, TX
Kolb FS II/HKS 700 |
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mccarthy(at)jefnet.com
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| Posted: Wed Dec 01, 2010 1:51 pm Post subject: Slingshot thrust line/angle/HKS |
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Tom,
That sounds like pretty good performance. I only get a climb rate of about 6-700
fpm on the Firestar, but that's enough for me to safely fly around here in the
flatlands.
Do you have the 3.47 - 1 gearbox or the 2.58?
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Jimmy Young
Missouri City, TX
Kolb FS II/HKS 700
Jim,
The motor came with the 3.47 gearbox, but wish it had the 2.58, If I was starting fresh. I believe the 2.58 with the gearbox down and a 66" 3 blade Warp on a Slingshot would work the best all things considered. I reserve the right to take that back after more testing, however.
The Slingshot is a neat little plane. Anyone interested in owning one should understand that there are a few differences between it and a FS or MK3.
First is the stall speed, in the high 40's, but still very Kolb like. The glide rate(or lack thereof) is something to get used to as well. It indicated around 700FPM descent at VY, but feels like even more. Also with the gear forward stance, it has close to 100lbs on the tail wheel, which makes it more of a hand full on the ground, and could easily make anyone look like a fool who does not pay attention on blacktop.
These differences I've mentioned are not negative to me, just the opposite. I just wanted to let people know. I'm glad it was not my first Kolb.
Tom McCarthy
Fort Atkinson, WI
N514 TM Zenith 601HD
N414 TM Kolb Firestar
N863 GB Kolb Slingshot
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