Go Back  RCU Forums > RC Airplanes > RC Jets
Reload this Page >

engine query

Notices
RC Jets Discuss RC jets in this forum plus rc turbines and ducted fan power systems

engine query

Old 12-28-2001, 01:32 AM
  #1  
nun45
Banned
Thread Starter
My Feedback: (1)
 
Join Date: Dec 2001
Location: GA
Posts: 225
Likes: 0
Received 0 Likes on 0 Posts
Default engine query

my wife and son bought me a yellow aircraft a-4 for xmas, problem is the ramtec fan is set up for os-91. i was thinking of a k&b 1.0 but was told it will cavitate once airbornnothing against os, just too pricey!any advice would be appreciated.---henry
Old 12-28-2001, 02:14 AM
  #2  
rcs1313
Senior Member
 
Join Date: Dec 2001
Location: Star, ID
Posts: 330
Likes: 0
Received 0 Likes on 0 Posts
Default os91

The only enginge you should be thinking about putting in the Yellow A-4 is the OS 91..

Rossi, maybe , but for all round no hassle , no tinkering performance get the Os91....you WILL be money ahead----period.

My opinion from experience.......

Rod Springer
Old 12-28-2001, 02:58 AM
  #3  
Charlie H.
Senior Member
My Feedback: (38)
 
Charlie H.'s Avatar
 
Join Date: Dec 2001
Location: Spokane, WA
Posts: 383
Likes: 0
Received 0 Likes on 0 Posts
Default Engine for A-4

I would only consider a OS 77 or 91 for your A-4 project.The 91 is a stong running and dependable engine.Finding a tuned pipe that will work with the K&B 100 , is a problem.

Good Luck
Charlie Hissom
Old 12-28-2001, 03:22 AM
  #4  
JohnVH
My Feedback: (38)
 
JohnVH's Avatar
 
Join Date: Dec 2001
Location: Ferndale, WA
Posts: 16,170
Received 6 Likes on 5 Posts
Default engine query

If it takes you a little longer to buy get the OS91, its one sweet running powerhouse, I love mine compared to an os77
Old 12-28-2001, 01:37 PM
  #5  
geneh-RCU
My Feedback: (6)
 
geneh-RCU's Avatar
 
Join Date: Dec 2001
Location: Madison Al
Posts: 643
Received 1 Like on 1 Post
Default engine query

Stay away from the K&B 1.0! You will have nothing but problems ( Broken Rods) A friend here had one in his Yellow F16 and broke several rods in it ( Including a RPM Rod!) It was never reliable!

Get the OS91 for it. Much better engine and you can get parts....
Old 12-28-2001, 11:09 PM
  #6  
Steve Collins
My Feedback: (8)
 
Join Date: Dec 2001
Location: St.Charles, MO
Posts: 2,777
Likes: 0
Received 4 Likes on 4 Posts
Default Engine Query

Follow these guys advice and get the O.S. .91. I would not recommend the O.S. .77 since it has been discontinued for several years. You might find a .77 on a swapshop or auction but good luck on finding parts.
Old 12-29-2001, 02:18 AM
  #7  
Jackjet
Senior Member
My Feedback: (1)
 
Jackjet's Avatar
 
Join Date: Dec 2001
Location: Apple Valley, CA
Posts: 1,137
Likes: 0
Received 0 Likes on 0 Posts
Default Ducted Fan Engine

Nun45,
you can use the OS.91 and it is a very good engine-but if you want max.power and performance-get a Rossi .90 or 1.05-heres what you can do-use 3 head shims-if you don't like the Rossi carb,(although it is a good carb)-a OS.91 carb can be used-Break the engine in just like the directions say-use 5% nitro fuel with 8 ozs. of extra castor oil added to it- a OS.91 will turn a Byron fan rotor at around 19,500-20,000 rpm. The Rossi .90 will spin it at 22,000-a lot more power.



Jackjet
Old 12-29-2001, 04:22 AM
  #8  
mvigod
Banned
 
Join Date: Nov 2001
Posts: 14,189
Likes: 0
Received 1 Like on 1 Post
Default Re: engine query

Originally posted by nun45
my wife and son bought me a yellow aircraft a-4 for xmas, problem is the ramtec fan is set up for os-91. i was thinking of a k&b 1.0 but was told it will cavitate once airbornnothing against os, just too pricey!any advice would be appreciated.---henry
Henry,

Nice plane...you have a good family to buy you such a great toy! I'm a little jealous
Old 12-30-2001, 12:54 AM
  #9  
DF_Flyer
Senior Member
 
Join Date: Dec 2001
Location: Mill Creek, IN
Posts: 185
Likes: 0
Received 0 Likes on 0 Posts
Default O. S. .91

Have you checked with National Hobbies in GA? A few months ago I picked up an O. S. .91 there for around $255, which puts it in roughly the same price ballpark as the K&B. I agree with the rest of the guys... You can't beat the small-head O. S. .91 for ducted fan reliability. It's worth the wait. Good luck! (BTW, it sounds like you have a GREAT family.)

b/r,
Earl

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

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright 2021 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.