Arty Trost
Joined: 25 May 2006
Posts: 206
Location: Sandy, Oregon
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 Posted: Tue Dec 29, 2020 10:49 pm Post subject: Going to a 72" prop |
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Richard -
Several years ago I put a longer prop on my Maxair Drifter. Like the Kolb, the Drifter is a taildragger pusher with a long, low boom. I made sure that there was plenty of clearance between prop and boom, and took it for a test flight. It was pretty gusty, and when I landed I bounced fairly hard. What I hadn't counted on was the amount of flex in the boom with a hard landing.
The occasional hard landing hadn't ever caused any problems in the past; in this case, the ending wasn't pretty. Unlike the strut-braced Kolb, the Drifter has wires. The boom flex caused the prop to go through the wires, which caused other mayhem. I ended up having to truck the Drifter to a friend's airport and get it rebuilt.
So - although you don't have any wires, and even though you may not do hard landings any more - you might want to build boom flex into your considerations about how much longer a prop to put on your Kolb.
You've got an incredible number of experienced Kolb pilots on this list - (and I have no Kolb experience at all) - so my experience might have no relevance for a Kolb MKIII.
Arty Trost
Sandy, Oregon
"I refuse to tip toe through life just to arrive safely at death."
On Tuesday, December 29, 2020, 03:54:49 PM PST, Richard Pike <thegreybaron(at)charter.net> wrote:
--> Kolb-List message posted by: "Richard Pike" <thegreybaron(at)charter.net (thegreybaron(at)charter.net)>
Still thinking about upgrading my Kolb MKIII, planning to go from a 68" Ivo to a 72" Warp Drive prop, will need to raise the engine so the prop will clear the boom tube.
The attached picture shows the typical / normal Lord shock mount method of attachment between the airframe and the motor mount plate.
One easy way to gain more prop clearance is to flip the Lord mounts over, they are 1" taller one way than the other, but I have never seen anybody do that.
Is there a reason why this is not a good idea?
--------
Richard Pike
Kolb MKIII N420P (420ldPoops)
Kolb Firefly Part 103 legal
Kingsport, TN 3TN0
Forgiving is tough, being forgiven is wonderful, and God's grace really is amazing.
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=499890#499890
Attachments:
http://forums.matronics.com//files/lordmounts_127.jpg
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