Beehive vs Dual springs… revisit an old topic from 2007
10-01-2023, 05:21 PM
#21
Teching In
Thread Starter
I'd like to say thanks for all your comments and especially the passion you all have for engines. Responding to a few comments:
TrendSetter:
Rick
TrendSetter:
Yes the load profile is very similar to an airboat. In fact my gearbox (1 speed transmission) was originally designed for the airboat community and modified to support aviation. See the link below. I know Sharron at Stinger and she owns an airboat. I'll give her a call.
https://www.stingerdrives.com/shop.html#!/Experimental-Aircraft-Gearbox-1-73/p/374595421/category=0
G Atsma:There is something to be said for simplicity. I am very convinced either spring will work. But the more I thought about it and read about it, the dual spring was really designed and focused on bigger power. Considering the root cause of a spring cracking or breaking (corrosion and mechanical damage) led me down the simple path. I've elected a beehive spring with 0.600 max lift and 130 lbs of seat pressure with a spring rate of 310 lbs/inch. It is a Summit Racing SUM-176004 replacement for use in LS1/2/3/... 4.8L - 7L LS engines. The higher seat pressure will mitigate a sticky valve.
All:Once flying, every year all aircraft must undergo an "Annual Inspection." For homebuilts the builder does this. For homebuilts, what is done in the Annual Inspection is 100% dependent on what the builder deems appropriate. One thing I am going to do is pull the valve covers and closely inspect the springs, rockers, etc. In addition I will check the cylinder compression's as well. Compression checks are a standard practice in all aircraft annually. The dialog here has led me to adding the spring inspection. The time it takes to pull a few bolts and look at the springs and rockers is trivial. I haven't fully decided on a number, but every N hours I am going to just replace the springs. They are not all that expensive and it doesn't take all that much time.
Again thanks for all the feedback!Rick
The following users liked this post:
G Atsma (10-01-2023)
10-02-2023, 12:22 PM
#22
TECH Fanatic
iTrader: (1)
I'd like to say thanks for all your comments and especially the passion you all have for engines. Responding to a few comments:
TrendSetter:
Rick
TrendSetter:
Yes the load profile is very similar to an airboat. In fact my gearbox (1 speed transmission) was originally designed for the airboat community and modified to support aviation. See the link below. I know Sharron at Stinger and she owns an airboat. I'll give her a call.
https://www.stingerdrives.com/shop.html#!/Experimental-Aircraft-Gearbox-1-73/p/374595421/category=0
G Atsma:There is something to be said for simplicity. I am very convinced either spring will work. But the more I thought about it and read about it, the dual spring was really designed and focused on bigger power. Considering the root cause of a spring cracking or breaking (corrosion and mechanical damage) led me down the simple path. I've elected a beehive spring with 0.600 max lift and 130 lbs of seat pressure with a spring rate of 310 lbs/inch. It is a Summit Racing SUM-176004 replacement for use in LS1/2/3/... 4.8L - 7L LS engines. The higher seat pressure will mitigate a sticky valve.
All:Once flying, every year all aircraft must undergo an "Annual Inspection." For homebuilts the builder does this. For homebuilts, what is done in the Annual Inspection is 100% dependent on what the builder deems appropriate. One thing I am going to do is pull the valve covers and closely inspect the springs, rockers, etc. In addition I will check the cylinder compression's as well. Compression checks are a standard practice in all aircraft annually. The dialog here has led me to adding the spring inspection. The time it takes to pull a few bolts and look at the springs and rockers is trivial. I haven't fully decided on a number, but every N hours I am going to just replace the springs. They are not all that expensive and it doesn't take all that much time.
Again thanks for all the feedback!Rick
The following users liked this post:
G Atsma (10-02-2023)