Saito 100 Props / RPMs  
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
       

All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> Glow Engines >> Saito 100 Props / RPMs
Page: [1] 2   next >   >>  

Login
Message << Older Topic   Newer Topic >>
Saito 100 Props / RPMs - 9/5/2002 3:58:38 PM   
_shadow_



Posts: 461
Joined: 8/27/2002
From: Shah Alam, MALAYSIA
Status: offline 		Guys,

I am about to purchase the Saito 100, please let me know what props are yall runing and what RPM do you get?

This engine is for the Ultra Stick 60.

Thanks in advance to all who reply.

Regards
Marcus
       Post #: 1

Saito 100 - 9/5/2002 4:28:16 PM   
Hobbsy



Posts: 10844
Joined: 12/2/2001
From: Colonial Beach, VA, USA
Status: offline 		14x7 three blade, 9,500 rpm

_____________________________

"I have gone faster backwards, upside down and on fire than most people have gone at all" Don Garlits

(in reply to _shadow_)
       Post #: 2

Saito 100 Props / RPMs - 9/5/2002 5:03:50 PM   
mfuess



Posts: 402
Joined: 9/5/2002
From: Bedford, TX, USA
Status: offline 		I have an identical engine/airplane set-up and found that a 14x8 (2 blade) works best. I have used a 14x7 three blade and it works well, but the mass weight slows the transition (throttle responce). Also, 20/20 fuel will give you superb idle and fast transition. I am very pleased with my Saito 100...

mfuess

(in reply to _shadow_)
       Post #: 3

Saito 100 Props / RPMs - 9/5/2002 11:56:42 PM   
DonM


 

Posts: 34
Joined: 1/8/2002
From: Nunavut, Canada, Above the Arctic Circle
Status: offline 		15 - 6, 9800 ( my choice for my application, GP Spacewalker )

14 - 8, 8900

Cool Power 15% fuel, set 300 rpm's rich.

I found this engine veeeeery thristy, I had to install a 20 oz. tank to safely get 12 mins. As a matter of fact this engine has made me take another look at gas engines, maybe a RCS 140.

(in reply to _shadow_)
       Post #: 4

Saito 100 Props / RPMs - 9/6/2002 12:18:05 AM   
ilikeplanes


 

Posts: 1058
Joined: 3/30/2002
From: portland, OR,
Status: offline 		I think I may be off Saito because of the thirsty aspect. Too bad because they run great and look good. Other motors produce like power for far less fuel. My Saito 72 has an appetite similar to my Webra 1.20 two stroke. And, the Webra pulls an 11lb airplane quite respectably.

My $.02

(in reply to _shadow_)
       Post #: 5

Saito 100 Props / RPMs - 9/6/2002 12:59:55 AM   
Sport_Pilot



Posts: 7826
Joined: 1/21/2002
From: Acworth, GA, USA
Status: online 		U'mm anybody run these things on a 14-6?

(in reply to _shadow_)
       Post #: 6

Saito 100 - 9/6/2002 1:48:20 AM   
Hobbsy



Posts: 10844
Joined: 12/2/2001
From: Colonial Beach, VA, USA
Status: offline 		I suspect it would float the valves with a 14x6.

_____________________________

"I have gone faster backwards, upside down and on fire than most people have gone at all" Don Garlits

(in reply to _shadow_)
       Post #: 7

Saito 100 Props / RPMs - 9/6/2002 2:12:22 AM   
Sport_Pilot



Posts: 7826
Joined: 1/21/2002
From: Acworth, GA, USA
Status: online 		I doub't it. Most 4-Strokes are good to almost 14,000 RPM nowdays. Thats about 12,000 on the ground. I have run a TT 91 to over 11,000 with a 12-9 or 10 prop. Sure it was running over 12,000 in the air. No problems. Just wanting to compare. I suspect the TT 91 does better on small props, and the Saito 1.00 on larger props.

(in reply to _shadow_)
       Post #: 8

Saito 100 Props / RPMs - 9/6/2002 5:36:00 AM   
ilikeplanes


 

Posts: 1058
Joined: 3/30/2002
From: portland, OR,
Status: offline 		Sport_Pilot , I suspect you're right. I've always wondered why an itty bitty model engine has such a low advertised speed limit compared to it's size. My motorcycle has a red line of 10.5k and it has 325cc jugs. The piston speed of a 10cc engine running at 10k has about the same piston speed as my motorcycle at 3k. Valve speed must be similar too. That's not even cruising speed.

So what gives?

(in reply to _shadow_)
       Post #: 9

Saito 100 Props / RPMs - 9/6/2002 8:10:13 AM   
Sport_Pilot



Posts: 7826
Joined: 1/21/2002
From: Acworth, GA, USA
Status: online 		I happen to know that some modlers have raced 4-strokes using the WM Midget Mustang. I think those who were winning were exceeding 12,000 RPM on the ground with an OS surpass. Running props such as 11-12 or something like that. This was posted on the usenet by a Mr. McDonald? He used to own a web based hobby supplier, sold a kit called a Balistick.

(in reply to _shadow_)
       Post #: 10

Saito 100 Props / RPMs - 9/6/2002 4:27:41 PM   
mfuess



Posts: 402
Joined: 9/5/2002
From: Bedford, TX, USA
Status: offline 		For the benefit of "new" comers to FOUR STROKE engines, I highly recommend you keep the RPM within the Mfg's specification. Most four strokes can, and will turn higher RPM under the right circumstances. However you risk damaging your engine. IF you have the need for brutal speed, then hang a two stroke on your plane using the 2X formula. EI: If you plane calls for a 45 two stroke, then... 2x45=90. Therefore you would hang a 90 or 91 two stroke and prop it to your flying style. Please understand that this formula is radical and should not be employed by novice or intermediate builders/pilots.

(in reply to _shadow_)
       Post #: 11

Saito 100 Props / RPMs - 9/6/2002 5:16:36 PM   
DonM


 

Posts: 34
Joined: 1/8/2002
From: Nunavut, Canada, Above the Arctic Circle
Status: offline 		Let's discuss this thirsty aspect about Saito engines, has anyone got an opinion why ?? My .56 and especially my 1.00 use huge quanities ( IMOP ) of fuel. I had an OS 1.08 2-stroke, I flew for years and always got 10-12 mins. with a 14 oz. tank My Saito 1.00 was running dry at 8 mins. with the same tank, had to install a 20 oz. tank. 15% fuel here in Canada is $30.00 with tax ouch !!!
I'm considering yanking the Saito and putting in a RCS 1.40. I can pay for it in about 300 flights.

(in reply to _shadow_)
       Post #: 12

Saito 100 Props / RPMs - 9/6/2002 5:27:59 PM   
Sport_Pilot



Posts: 7826
Joined: 1/21/2002
From: Acworth, GA, USA
Status: online 		Most 4-stroke engines have a maximum recommended ground RPM of 11,000 to 13,000 RPM. Note OS engines vary by that much. http://www.osengines.com/engines/surpass.html

Unless you go into an extended dive at full power you shouldn't have any valve float problems if you keep static RPM below these numbers. Saito doesn't seem to have this spec listed on their site. Valve float doesn't automatically mean damage to the engine, though a cracked valve spring is possible. IMO the damage isn't expensive enough to unduly worry about it.

As for as drinking fuel. More power = more fuel. The TT. 91 eats up more fuel than any non supercharged .91, and it has more power. But service is terrible! Next time I will go with another brand. The first four strokes were low on power, used less fuel, and limited to 10,000 RPM (sometimes less, I think the first OS was limited to 9,000 RPM).

(in reply to _shadow_)
       Post #: 13

Saito 100 Props / RPMs - 9/6/2002 6:47:04 PM   
mfuess



Posts: 402
Joined: 9/5/2002
From: Bedford, TX, USA
Status: offline 		Mr. DonM,

You have a serious problem if you are only getting 8 minutes on 14oz. tank!!!!! My Saito 100 running on 20/25 nitro, runs at .75 oz. per minute (at full throttle)! Yours appears to get 1.75 oz. per minute.... You're burning OVER DOUBLE what you should be!!

Mfuess

(in reply to _shadow_)
       Post #: 14

Saito 100 Props / RPMs - 9/6/2002 7:14:18 PM   
DonM


 

Posts: 34
Joined: 1/8/2002
From: Nunavut, Canada, Above the Arctic Circle
Status: offline 		My .56 uses that much fuel. I have it in a FF Ultimate and if I run the whole flight at full throttle it will run a 6 oz. tank dry in 7 or 8 mins. You have to be flying a lot at 1/2 throttle or so to get that kind of mileage.

(in reply to _shadow_)
       Post #: 15

Saito 100 Props / RPMs - 9/6/2002 7:23:11 PM   
Sport_Pilot



Posts: 7826
Joined: 1/21/2002
From: Acworth, GA, USA
Status: online 		[QUOTE]Originally posted by mfuess
Mr. DonM,

You have a serious problem if you are only getting 8 minutes on 14oz. tank!!!!! My Saito 100 running on 20/25 nitro, runs at .75 oz. per minute (at full throttle)! Yours appears to get 1.75 oz. per minute.... You're burning OVER DOUBLE what you should be!!

Mfuess [/QUOTE]

While 1.75 oz./min seems high .75 seem almost equally low. My TT .91 gets less than 14 minutes on 25% nitro. I estimate about 12 minutes. I timed it at about 16 minutes running slightly rich on 10 or 15% nitro after installing it in the plane. After that I set my timer for 14 minutes figuring I would have enough part throttle time to be plenty safe. Well after switching to 25% nitro I didn't think to reset the timer. After several flights I had a deadstick. After setting the plane on the bench the timer went off. Opps I was out of fuel.

(in reply to _shadow_)