Inverted Four Stroke?  
View related threads: (in this forum | in all forums)

Tower Hobbies
Enter up to 4 keywords or Tower stock numbers
Logged in as Guest



Users viewing this topic: none
  Printable Version
       


TurboHeader Muffler
Seller:  RC Specialties
Details:   $69.95   |  7/5/2008   |  Classified Ad
We will rotate YOUR AD in this spot if you select "Forum Featured" when placing or editing your ad!

All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> Inverted Four Stroke?
Page: [1]

Login
Message << Older Topic   Newer Topic >>
Inverted Four Stroke? - 12/5/2001 8:29:26 AM   
maverick



Posts: 1575
Joined: 11/29/2001
From: Alameda, CA, USA
Status: offline 		Any comments on running an OS FS-70 II inverted?

I have heard differing opinions varying from absolutely never run any glow engines inverted, to it will cause no problems at all.

What is the real scoop?

_____________________________

Maverick: "Too close for missiles, I'm switching to guns!"
       Post #: 1

Inverted Four Stroke? - 12/5/2001 8:34:53 AM   
Nathan



Posts: 4588
Joined: 12/2/2001
From: Holland, MI, USA
Status: offline 		It will cause no problems at all... thats my opinion. I've yet to read anything to convince me otherwise, and have seen it done too often with success to think anything else.

I am not an engine expert by any means however.

_____________________________

Nathan M.
Administrator
RCUniverse.com | Wattflyer.com | RCUvideos.com | Kaango.com

(in reply to maverick)
       Post #: 2

Inverted four strokes - 12/5/2001 10:08:32 AM   
mglavin



Posts: 5200
Joined: 11/29/2001
From: Elverta, CA, USA
Status: offline 		Nearly all my four strokes are mounted inverted...

Some care and special handling is required... You can easily hydraulic any engine inverted.

Properly tuned and operated you will have no problems at all...:p

_____________________________

Michael Glavin
RCU Community Moderator
Hitec * Multiplex Field Representative

(in reply to maverick)
       Post #: 3

Inverted Four Stroke? - 12/5/2001 7:45:32 PM   
rcflyer-RCU


 

Posts: 2
Joined: 11/29/2001
From: Gull Harbor, NC, USA
Status: offline 		Mav,
You must take care not to flood the engine when starting/ priming. Other than that, there are no negative issues with an inverted engine. 4cyl or otherwise.
David

(in reply to maverick)
       Post #: 4

Inverted Four Stroke? - 12/5/2001 9:46:07 PM   
maverick



Posts: 1575
Joined: 11/29/2001
From: Alameda, CA, USA
Status: offline 		Yeah, I know about hydraulic lock, but was just wondering about flame-outs due to fuel pooling in the head when idling.

_____________________________

Maverick: "Too close for missiles, I'm switching to guns!"

(in reply to maverick)
       Post #: 5

Inverted engines - 12/6/2001 8:56:54 PM   
w0mbat



Posts: 373
Joined: 12/6/2001
From: Lake Havasu City, AZ, USA
Status: offline 		Every inverted 4 stroke that I have used or seen has had a problem starting because the fuel pools in the glow plug area and makes it difficult to start unless you turn the aircraft upside down. I do not invert engines for this reason.

(in reply to maverick)
       Post #: 6

Inverted Four Stroke? - 12/7/2001 9:23:32 AM   
maverick



Posts: 1575
Joined: 11/29/2001
From: Alameda, CA, USA
Status: offline 		I think I have opened a can of worms! I already have differing answers. I guess I will just have to try it for myself and see.

_____________________________

Maverick: "Too close for missiles, I'm switching to guns!"

(in reply to maverick)
       Post #: 7

Inverted Four Stroke? - 12/8/2001 7:51:33 PM   
ricfly52


 

Posts: 133
Joined: 12/7/2001
From: Las Vegas, NV, USA
Status: offline 		I have an OS 70 S ll in a Texan inverted. It starts, and runs like a champ. You can flood it out if your not careful, but after a few starts, you will know just how much prime it needs.

Good luck, this is a great engine.

Rick

(in reply to maverick)
       Post #: 8

Inverted Four Stroke? - 12/8/2001 8:45:30 PM   
maverick



Posts: 1575
Joined: 11/29/2001
From: Alameda, CA, USA
Status: offline 		Thanks for the feedback guys. It is sounding like it will be OK if I be careful about flooding the engine when starting it.

I have also heard nothing but good about the OS FS-70 II.

We shall see soon. It is going inverted into a World Models P-51.

_____________________________

Maverick: "Too close for missiles, I'm switching to guns!"

(in reply to maverick)
       Post #: 9

Inverted Four Stroke? - 12/9/2001 7:42:57 PM   
cascar38


 

Posts: 14
Joined: 12/9/2001
From: Ufford,Ontario,Canada
Status: offline 		I inverted an OS Surpass 70 in a Global PT 19 with no problems at all. I even purchased an onboard glow lighter just in case but never had a need to install it.
As for starting it, I don't prime it at all, just put the glow driver on (used a remote set up) and crank it over with the electric starter.
Starts with little or no problems at all and I can't remember when I had a dead stick with it.

dj

(in reply to maverick)
       Post #: 10

Inverted Four Stroke? - 12/16/2001 12:41:56 AM   
FlyinRazorback



Posts: 293
Joined: 12/12/2001
From: Memphis, TN
Status: offline 		I flew a Top Flite Spitfire with an inverted Saito .91 and it ran beautifully (I later put it on a World Mits. Zero). I read in an article either in RCM or MAN that 4 strokes actually run better than 2 strokes when inverted.

(in reply to maverick)
       Post #: 11

inverted? - 12/17/2001 12:27:45 AM   
dick Hanson



Posts: 9858
Joined: 12/12/2001
From: slc, UT, USA
Status: offline 		Sure - not a problem with any current engines-
also -most current stuff starts so easily that a glove and a flip against compression gets em going.
Starters are a double edged sword-you can bust a small engine -cramming them into a wet cylinder.
OS70 is my all time favorite four stroke . It simply is quality at it's best and dead reliable.IF you put the tank where is is supposed to be!
If you are new at the game - you may care to try this approach:
Fuel - use a heli blend -15-25% nitro-lotsa oil.
use only very hard wood or nylon filled props . NEVER use a plastic backplate spinner.
Make sure that the prop/spinner assy is tight -always . a piece of 600 grit sandpaper glued to back of spinner backplate is a good idea.-this is to prevent slip between the drive washer and the spinner backplate.
Use only a big nicad to start the engine .
Use OSF plug-
hook up fuel system so that you can easily check for fuel flow-an external loop may look goofy but it sure makes setup easy.
Always choke/hand flip cold engine -without glow attached , until the engine starts to feel loose -or a little wet.
Put engine to idle, choke off now -hook up glow .
carefully pull prop thru (remember the glove) - It should "bump".
give the prop a smart back flip - it should start.
I have had at least 4- 70 OS engines more OS 1.20s of all types and this procedure is 100%.

(in reply to maverick)
       Post #: 12

Inverted Four Stroke - 12/17/2001 1:21:10 AM   
Tex Pilot


 

Posts: 44
Joined: 12/16/2001
From: South Central Oklahoma
Status: offline 		I built a Greatplanes P-51 and mounted a Saito 72 inverted and it just flew awesome. It is still flying fantastic. This plane was built for a friend and it is one of his favorites. It will hydro lock if you are not careful. It's just one of those things you have to get used to . He knows how to start the engine and very seldom gets hydro lock anymore. I highly recommend it....... as it is the only way to get some planes to look just right.

(in reply to maverick)
       Post #: 13

4/stroke inverted - 12/17/2001 1:50:52 AM   
FIVESQUARE



Posts: 625
Joined: 12/9/2001
From: little rock, AR, USA
Status: offline 		I have a 40 size ultimate bipe with an OS91 4/s. Zero problems.
I do like the OS 4 strokers, but my heart is with Saitos.
5

_____________________________

When things start going wrong while airborne, its like the whole world is a tuxedo, and you are a pair of brown shoes.

(in reply to maverick)
       Post #: 14

4/s inverted - 12/17/2001 8:24:26 AM   
Tex Pilot


 

Posts: 44
Joined: 12/16/2001
From: South Central Oklahoma
Status: offline 		Hey Fivesquart. Is the Ultimate a Greatplanes Ultimate 40? I have one I have finished........ I put in a Super Tigre .51 with Slimline Pitts muffler. I have heard that a .91 four stroke is the answer to this plane. Thinking about changing it. I have not flown it or radioed it yet. Tex

(in reply to maverick)
       Post #: 15

Yup - 12/17/2001 8:38:28 AM   
FIVESQUARE



Posts: 625
Joined: 12/9/2001
From: little rock, AR, USA
Status: offline 		Yeah TEX,
The 91 is the magic formula for this puppy.
Unless you have long eyes, verticle will make you shiver!
BTW Its FIVESQUARE. FiveQUARTS go in my silverado.

5

_____________________________

When things start going wrong while airborne, its like the whole world is a tuxedo, and you are a pair of brown shoes.

(in reply to maverick)