O.S. Engines Support Ask Bill Baxter your questions about O.S. Engines.

OS Fr7-420 questions


Old 09-07-2017, 04:05 PM
Thread Starter
Join Date: Feb 2007
Location: Columbia, MO
Posts: 15
My Gallery
My Models
My Feedback
Default OS Fr7-420 questions

I'm looking at getting an OS Fr7-420 engine and have a a couple of questions:
1. The manual (page 18) says to connect a piece of tubing to the breather nipple, and the accmpanying diagram shows the drain plug installed in this tube. Should the breather/drain be open or closed for operation?
2. To match the engine to an airframe; what rpm should i expect with a 22x10 prop?

Thank you,

Last edited by tdevince; 09-07-2017 at 04:16 PM.
tdevince is offline  
Reply With Quote

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Thread Tools
Search this Thread
Display Modes

Contact Us Archive Advertising Cookie Policy