Questions and Answers If you have general RC questions or answers discuss it here.

OS LA-40 compared to OS FP-40

Reply

Old 07-08-2007, 02:43 PM
  #1  
propjobbill
Senior Member
Thread Starter
 
Join Date: Jan 2004
Location: Oberlin, OH
Posts: 404
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default OS LA-40 compared to OS FP-40

OS LA-40 compared to OS FP-40

What is the difference between the LA-40 and FP-40? With a 10-6 prop can you expect the FP to have more rpm, and how much more power. Thanks
propjobbill is offline  
Reply With Quote
Old 07-08-2007, 03:03 PM
  #2  
bigchap
Senior Member
 
Join Date: Mar 2004
Location: frimley,surrey., UNITED KINGDOM
Posts: 1,040
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: OS LA-40 compared to OS FP-40

all the la's i've used are finicky beasts,the fp's are absolute gems,i have a few that i've had a long time and they're totally dependable,the la was a step backwards in my opinion.as to power differences in my experience the fp has a slight edge.
bigchap is offline  
Reply With Quote
Old 07-08-2007, 04:19 PM
  #3  
DavidAgar
My Feedback: (107)
 
DavidAgar's Avatar
 
Join Date: Dec 2001
Location: Battle Ground, WA
Posts: 5,019
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: OS LA-40 compared to OS FP-40

The FP engines were first and then came the LA and the FP engines went bye bye. The FP engines were without a doubt the best non bearing engines made. I have a couple of LA engines and they do run okay when they are adjusted corrrectly, however they do not hold a candle to the FP. The FP engines that I am still flying have more power and are alot more dependable. If you have a choice, go with the FP. Good Luck, Dave
DavidAgar is offline  
Reply With Quote
Old 07-08-2007, 06:25 PM
  #4  
broke_n_bummin
Senior Member
 
broke_n_bummin's Avatar
 
Join Date: Mar 2006
Location: Kershaw, SC
Posts: 838
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: OS LA-40 compared to OS FP-40


ORIGINAL: propjobbill

OS LA-40 compared to OS FP-40

What is the difference between the LA-40 and FP-40? With a 10-6 prop can you expect the FP to have more rpm, and how much more power. Thanks
answer: .73 ounces and the location of the needle valve. The LA is the predacessor to the FP. I have both and don't notice any difference in power or RPM The LA is slightly lighter. That might give it a slight edge, but as far as power, they both pull my SPADs the same. If you use 15%, most of the carb problems will go away.
broke_n_bummin is offline  
Reply With Quote
Old 07-08-2007, 08:29 PM
  #5  
RCVFR
Senior Member
My Feedback: (7)
 
Join Date: Feb 2002
Location: Keller, TX
Posts: 2,050
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: OS LA-40 compared to OS FP-40

Well, almost: the FP is the predecessor to the LA. The LA is the successor to the FP.
RCVFR is offline  
Reply With Quote
Old 07-08-2007, 10:20 PM
  #6  
broke_n_bummin
Senior Member
 
broke_n_bummin's Avatar
 
Join Date: Mar 2006
Location: Kershaw, SC
Posts: 838
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: OS LA-40 compared to OS FP-40


ORIGINAL: Jim Dines

Well, almost: the FP is the predecessor to the LA. The LA is the successor to the FP.
Yeah ... what he said....
broke_n_bummin is offline  
Reply With Quote
Old 07-09-2007, 09:57 AM
  #7  
rcdude7
Senior Member
My Feedback: (264)
 
Join Date: Apr 2003
Location: Great Mills, MD
Posts: 2,223
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: OS LA-40 compared to OS FP-40

The FP has a few things going for it that are missing from the LA. Metal backplate, full length crankshaft bushing on the fp, the LA makes due with a two short bushings to cut mfg costs. I also prefer the six bolt head and needle assy. on the carb instead of backplate.
rcdude7 is offline  
Reply With Quote
Old 07-09-2007, 10:59 AM
  #8  
bigchap
Senior Member
 
Join Date: Mar 2004
Location: frimley,surrey., UNITED KINGDOM
Posts: 1,040
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: OS LA-40 compared to OS FP-40

i just got a b.n.i.b. 35 fp,you can keep those horrible la's!
bigchap is offline  
Reply With Quote
Old 07-09-2007, 01:48 PM
  #9  
jaka
 
Join Date: Dec 2001
Location: Upplands Vasby, SWEDEN
Posts: 7,788
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: OS LA-40 compared to OS FP-40

Hi!
Horrible...???
Most be a missunderstanding! The OS LA line of engines are as good as the FP.
Same power, same increadable good idle and throttle characteristics.
A perfect engine for newbies as well as for adwanced flires who want a dead sure engine for their twin engine airplane, where outmost reliability is required.
Bad?....Must be joke!

A 10x6 prop is no good for these .40 or .46 engines if used in a high winged trainer like the Kyosho Calmato trainer. Instead use a 11x5 or a 11x6 , preferable APC or RAM.
jaka is offline  
Reply With Quote
Old 07-09-2007, 02:34 PM
  #10  
propjobbill
Senior Member
Thread Starter
 
Join Date: Jan 2004
Location: Oberlin, OH
Posts: 404
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: OS LA-40 compared to OS FP-40

I've never tried an 11x6 prop, I thought that would be to much. I will be going to the hobby shop later this week. Do you have any idea what rpm's an 11x6 apc will turn with 15% nitro?
propjobbill is offline  
Reply With Quote
Old 07-09-2007, 10:46 PM
  #11  
HighPlains
My Feedback: (1)
 
Join Date: Mar 2003
Location: Over da rainbow, KS
Posts: 5,085
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: OS LA-40 compared to OS FP-40

The OS FP was a very nice sport motor. A good replacement is the TT GP42, though you will have to put up with slightly lighter weight and more power.
HighPlains is offline  
Reply With Quote
Old 07-10-2007, 08:20 AM
  #12  
jaka
 
Join Date: Dec 2001
Location: Upplands Vasby, SWEDEN
Posts: 7,788
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: OS LA-40 compared to OS FP-40

Hi!
well ..around 9000-10000 rpm! Just a guess.
It doesn't really matter what the rews are as long as the engine can handle the load.
Why! 15% nitro????
The OS runs perfectly on just 5% nitro.
jaka is offline  
Reply With Quote
Old 07-10-2007, 09:31 AM
  #13  
bigchap
Senior Member
 
Join Date: Mar 2004
Location: frimley,surrey., UNITED KINGDOM
Posts: 1,040
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: OS LA-40 compared to OS FP-40

i've run a 40fp on straight fuel no probs at all,there seems to be a lot of people on this site convinced that high nitro is the answer to all ills,i've seen posts where 20% nitro is used in super tigre engines which are actually designed to use no nitro.
bigchap is offline  
Reply With Quote
Old 07-10-2007, 09:37 AM
  #14  
jaka
 
Join Date: Dec 2001
Location: Upplands Vasby, SWEDEN
Posts: 7,788
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: OS LA-40 compared to OS FP-40

Hi!
Yeah! The Yanks seem to favor lots of nitro (15%).
jaka is offline  
Reply With Quote
Old 07-10-2007, 01:54 PM
  #15  
propjobbill
Senior Member
Thread Starter
 
Join Date: Jan 2004
Location: Oberlin, OH
Posts: 404
Gallery
My Gallery
Models
My Models
Ratings
My Feedback
Default RE: OS LA-40 compared to OS FP-40

I JUST GOT AN 11X5 APC PROP. IT TURNED AT 11,500 = 12,300 FOR STATIC TEST ON MY LA-40. ACCORDING TO THRUSTHP IT SHOULD GIVE ME 6.64 POUNDS OF THRUST AT OVER 58 MPH AT 12,300. I WILL TRY AN OS 40-FP TOMORROW. BUT THAT SOUNDS LIKE WHAT I AM LOOKING FOR. THIS IS A DIFFERENT ENGINE FROM THE ONE ON THE TRAINER, IT'S RUNS 11,300 WITH A 10-6 MASTER AIRSCREW PROP. THRUSTHP SAYS IT ONLY HAS 3.83 POUNDS OF THRUST AT 64 MPH. I CAN'T WAITE TO GET TO THE FIELD AND SEE HOW IT FLYS WITH THE 11-5 APC.

AND THAT WAS ON 10% NITRO.
propjobbill 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

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service