Thorp Air Command - T18.net

Supporting Owners, Builders and Pilots of the Thorp T-18 and its variants.
It is currently Tue Nov 20, 2018 11:50 pm

All times are UTC - 6 hours [ DST ]




Post new topic Reply to topic  [ 18 posts ]  Go to page Previous  1, 2
Author Message
Jeff J
PostPosted: Sat Nov 03, 2018 3:13 pm 
Sr. Member
Sr. Member

Joined: Wed Aug 31, 2016 8:18 am
Posts: 420
Images: 0
Location: eastern OK
klw033 wrote:
My interest in a digital tach came when balancing the engine. The mechanical tach, original to the airplane, was 100+ RPM off...


That is pretty common among mechanical tachs. It is also why good prop balancing systems use their own calibrated tach and why it isn’t recommended to set up new or overhauled engines using the aircraft instruments. As long as it is consistent it is pretty easy to live with. One aircraft I don’t own but fly quite a bit is pretty accurate on cool days but off by as much as 200 rpm on hot days. I use manifold and fuel pressures to set rpm on that one and verify with a “true tach”, if I remember to grab it.

_________________
Thorp T18
O-320-B3B (160 HP)
68x74 Sterba Propeller

"The joke in aviation is, 'If you want to make a million, you'd better start with £10m.' " -Bruce Dickinson


Top
 Profile Personal album  
 
KWK
PostPosted: Wed Nov 07, 2018 1:24 pm 
Jr. Member
Jr. Member

Joined: Sat Aug 01, 2015 1:42 pm
Posts: 75
Location: Illinois
The type certificate for the O-320 lists max continuous power at 2700. (Depending on the suffix, some models are as low as 2450.) Dynamometer curves in the owner's manual go to 2800. I didn't notice a specific "red line" number in either document.


Top
 Profile  
 
Jeff J
PostPosted: Thu Nov 08, 2018 6:09 am 
Sr. Member
Sr. Member

Joined: Wed Aug 31, 2016 8:18 am
Posts: 420
Images: 0
Location: eastern OK
You won’t. RPM “limits” are set in the aircraft TC but you would be hard pressed to find one that exceeds the “max continuous” listed in the engine documents.

_________________
Thorp T18
O-320-B3B (160 HP)
68x74 Sterba Propeller

"The joke in aviation is, 'If you want to make a million, you'd better start with £10m.' " -Bruce Dickinson


Top
 Profile Personal album  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 18 posts ]  Go to page Previous  1, 2

All times are UTC - 6 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 4 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

[ Time : 0.094s | 10 Queries | GZIP : On ]