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Old 04-21-2019, 03:56 AM
  #40226  
Jesse Open
 
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Originally Posted by Hobbsy


No fillet, makes for weak point.
Stock Saito 90 degree elbow, no fillet
Not only no fillet but that one is cast. Generous fillets are a part of good design practice.
7075 aluminum makes them even stronger yet



And, like the muffler that showed a decent RPM increase, The price for flying buddies, is right

Last edited by Jesse Open; 04-21-2019 at 04:02 AM.
Old 04-21-2019, 08:12 AM
  #40227  
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Originally Posted by Jesse Open


Not only no fillet but that one is cast. Generous fillets are a part of good design practice.
7075 aluminum makes them even stronger yet

And, like the muffler that showed a decent RPM increase, The price for flying buddies, is right
Roger all that and I was inches away from buying a TH muffler for my 82 when you stepped in with your custom design. Much more eye pleasing to me and yes, the price was much better too. . I'll bet those 90 pressure fittings are indispensable for certain applications. Great idea.
Old 04-21-2019, 08:24 AM
  #40228  
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wow, listen to this FG 60R3

Old 04-21-2019, 08:36 AM
  #40229  
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Originally Posted by Rudolph Hart
FA115 SIDE mounted in a 55" cmpro midget mustang that badly needs a bath and a haircut or a holiday
Lonnie you could also look at the fa115,i'd have to check but it is much smaller than both the fa125 and fa100,sr tele has all the figures.

ps jim nicely tuned saito in the spitfire and the guy flying it handles the engine well.
Pete, my VQ P-40 is about the same size (62" span), she should come in around 10 pounds, and like the Spitfire she would do well with a FA100 in her, but she should grab some big-air with the 115 in her

Jim
Old 04-21-2019, 08:40 AM
  #40230  
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Originally Posted by Captcrunch44
Wasp
that is very cool
I'm telling you, if I could find a 100IL Twin NIB for a good price I just may buy it !!!

Jim
Old 04-21-2019, 08:41 AM
  #40231  
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Originally Posted by the Wasp
wow, listen to this FG 60R3
One of the best sounding Saitos I've heard.
Old 04-21-2019, 08:48 AM
  #40232  
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Originally Posted by Rudolph Hart
Guys at the club called it the red lawn dart fly's like it's on rails.

ps jim did you know that spitty looks like a photo recco high altitude mk9 with the pointy extended wingtips?
all I know is that it looks cooler than the Bell X1 braking the sound barrier

Jim
Old 04-21-2019, 02:26 PM
  #40233  
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Shouldn't have flown today but did anyway. Gusting winds 5-20 mph and off and on like a light switch. I think I broke my record for go arounds on that last landing.

Gary, I love the way the 65 muffler sounds on the 62 in the air. Cackles and barks.

Jim, I have three huge sets of orings and couldn't find a suitable one to adapt the 100 carb to the 82 intake manifold. Ultra copper fixed the issue but I'll have to wait until tomorrow to run it.

Last edited by Glowgeek; 04-21-2019 at 04:21 PM.
Old 04-21-2019, 05:26 PM
  #40234  
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Originally Posted by Glowgeek
Shouldn't have flown today but did anyway. Gusting winds 5-20 mph and off and on like a light switch. I think I broke my record for go arounds on that last landing.

Gary, I love the way the 65 muffler sounds on the 62 in the air. Cackles and barks.

Jim, I have three huge sets of orings and couldn't find a suitable one to adapt the 100 carb to the 82 intake manifold. Ultra copper fixed the issue but I'll have to wait until tomorrow to run it.
thumbs up on that one

Jim
Old 04-22-2019, 02:24 AM
  #40235  
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Jim what we really need is for saito to design and build a 37 litre v12 that runs on 40% nitro for under two grand,then you'll be flying this.With full drop tanks i reckon you could taxi to at least the down wind end of the strip before she died

Originally Posted by Glowgeek
One of the best sounding Saitos I've heard.
I dunno my fg57 has a nice bark on shotgun pipes,there are you tube vids of fg57's flying all sorts of planes,nice grunty crackle from the pipes.
Old 04-22-2019, 03:17 AM
  #40236  
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Arguably, the more cylinders they have the better they sound.
Old 04-22-2019, 03:33 AM
  #40237  
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Originally Posted by Glowgeek
Arguably, the more cylinders they have the better they sound.
when the 5 cylinder Saito came out I was hugely disappointed in the sound. I was expecting more bark but it was really smooth and quiet.
Old 04-22-2019, 12:13 PM
  #40238  
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I really like the odd fire twins sound about the best.
Old 04-22-2019, 01:58 PM
  #40239  
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Speaking of, the pipes look good on the 90-T Thanks again, I need to fire it up, I haven't run it since it's rebuild. I put the pressure tap pipe on the right cylinder so the pressure tap would face inward.
Old 04-22-2019, 05:19 PM
  #40240  
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Default Saito FA82 CR Mod

With compression increase to 10.5:1, upgraded exhaust (Gary's)and upgraded carb (fa100) the pig is spinning an apc 14x6 at 9900 rpm on 15% nitro. Up 700 rpm over the stock config.

Even though I've exceeded my original goal of 9800 peak rpm with an apc 14x6 I'm not done yet. The intake and exhaust ports have a 90 short turn (no radius). Perhaps a little light porting to smooth out those short turns would yield yet a little more umph. I will however first bump the CR to 11:1 and see what happens. At least that mod would be reversible in the event that it spits props or hammers glow plugs.

Last edited by Glowgeek; 04-22-2019 at 05:42 PM.
Old 04-22-2019, 05:50 PM
  #40241  
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I have an 80 with 15.5 to 1 compression, it only kicks props when leaned to far, like all others. My 150 has 11.24 to 1 compression and my oldest 65 is 12.97 to 1. Keep us posted as it goes up, that's good stuff.
Old 04-22-2019, 05:55 PM
  #40242  
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Originally Posted by Hobbsy
I have an 80 with 15.5 to 1 compression, it only kicks props when leaned to far, like all others. My 150 has 11.24 to 1 compression and my oldest 65 is 12.97 to 1. Keep us posted as it goes up, that's good stuff.
Thanks Dave. Any idea what was recommended for max nitro content for those three engines? Better yet, what nitro content are you getting away with?
Old 04-22-2019, 06:04 PM
  #40243  
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Turning a Bolly 13.5 x 8, the idle was 1,770.

The early 80 had a lot of 15% put through it but now only 10%, I figured a long time ago the high nitro methane percentage was not necessary. I also used several gallons of 5% which was very smooth running.
The 80 will fire up and run on Davis Diesel fuel, I removed the coil from the glow plug to prove it to my self. As can be seen by the tank, the muffler pressure really dirtied up the fuel.

Last edited by Hobbsy; 04-22-2019 at 06:09 PM. Reason: Add picture
Old 04-22-2019, 06:31 PM
  #40244  
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Originally Posted by Hobbsy
The early 80 had a lot of 15% put through it ......
Interesting, I would have thought at 15.5:1 CR that 15% would have caused issues. Hammered glow plugs from detonation, overly rich midrange, very wide hsn adjustments etc.
Old 04-22-2019, 07:11 PM
  #40245  
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Originally Posted by Glowgeek
With compression increase to 10.5:1, upgraded exhaust (Gary's)and upgraded carb (fa100) the pig is spinning an apc 14x6 at 9900 rpm on 15% nitro. Up 700 rpm over the stock config.

Even though I've exceeded my original goal of 9800 peak rpm with an apc 14x6 I'm not done yet. The intake and exhaust ports have a 90 short turn (no radius). Perhaps a little light porting to smooth out those short turns would yield yet a little more umph. I will however first bump the CR to 11:1 and see what happens. At least that mod would be reversible in the event that it spits props or hammers glow plugs.

Jim
Old 04-22-2019, 07:26 PM
  #40246  
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Gary, I received the valves today, thank you very much, but I have to rig up some way to add ARO, these Saitos are no OS 50 and will be taken cared of

Jim
Old 04-22-2019, 11:34 PM
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Originally Posted by Glowgeek
Thanks Dave. Any idea what was recommended for max nitro content for those three engines? Better yet, what nitro content are you getting away with?
Lonnie if you don't already know maybe you could ask dave's neighbours where the prop sometimes ended up on his old fa150 i usually run 10% for general flying but you can easily go up to 40% if you like more aerobatic performance,but shorter flight times result on the same size tank,there is a noticeable change in the way the engine barks and it's only a two minute re tune richer.There is a massive difference in max rpm.
Old 04-23-2019, 12:02 AM
  #40248  
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Sorry i got interrupted and meant to say that the more nitro you add the less return you get in max rpm as you go to a higher percentage,it starts to drop off after 30%.....plus! if you are stuck in a poorly ventilated shed bench running your saito be prepared to get a bit teary eyed,the nitro is like a good hot sauna for your tear ducts,and lastly...enjoy!
Old 04-23-2019, 02:46 AM
  #40249  
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Lonnie, here is Clarence Lee's word on the high compression 80: Saito FA-80

And the HC 150: http://sceptreflight.com/Model%20Eng...20FA-150S.html

Last edited by Hobbsy; 04-23-2019 at 02:49 AM. Reason: Add content
Old 04-23-2019, 02:48 AM
  #40250  
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Thanks Pete, yes I get that but nitro advances the ignition timing and you can only induce so much fuel charge into the combustion chamber with any given engine setup. Higher compression also advances the ignition timing and although it also contributes to higher volumetric efficiency at some point the introduction of higher nitro will bring on detonation.
A fella can keep raising the nitro content in his fuel until no further peak rpm is seen and then back off a percent or two for safety but yes, it will drain the tank and the bank.

What my little project is all about is to raise engine hp through volumetric efficiency and hopefully realize some long term cost savings with little initial investment. Besides, I enjoy engine modding as much as flying. I also like slighting the EPA whenever possible but that's another topic, one that I believe nitro users will be discussing more and more in the not so distant future here in the US.

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