Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Revise engine cylinder head mass #444

Closed
hbeni opened this issue Oct 15, 2021 · 0 comments · Fixed by #445
Closed

Revise engine cylinder head mass #444

hbeni opened this issue Oct 15, 2021 · 0 comments · Fixed by #445
Assignees
@hbeni
Labels
FDM systems

Comments

@hbeni
Copy link
Collaborator

hbeni commented Oct 15, 2021

Currently the cylinder head mass is arbitarily set to 4 KGs. This influences engine cooling alot.

It was hard to find some source for the cylinder head mass, but I fund a replacement kit here: https://skygeek.com/textron-lycoming-lw13870-cylinder-assembly.html
It says 21.7lbs (~9.85Kg):
grafik

The entire engine weights (according to the list in the POH) 400lbs.
21.7*6=130, leaving 270lbs for other stuff.
Sounds sensible.

Flight testing showed that we now can do a max-power takeoff without quickly overheating in summer. Takeoff from 200ft at 24°C OAT (fair weather setting) allowed me to climb @80 knots to pattern altitude; CHT was 440°F.
Climbing further brought me to 2500ft when hitting the red line.
hbeni added a commit that referenced this issue Oct 15, 2021
@hbeni
Revise engine cylinder head mass
0777018 
Previously we used 4Kg as arbitarily choosen head mass.
I found a shop listing a cylinder head at 21.7 lbs (~9.85 Kg; complete engine is 400 lbs according to POH 6-22).

Fix #444
@hbeni hbeni self-assigned this Oct 15, 2021
@hbeni hbeni mentioned this issue Oct 15, 2021
Merged
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment
Assignees

@hbeni hbeni

Labels
FDM systems
Projects
None yet
Milestone
No milestone
Development

Successfully merging a pull request may close this issue.

Revise engine cylinder head mass HHS81/c182s
1 participant
@hbeni