Engine Selection ... Saito 72 or 82?
05-05-2006 | 10:40 AM
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From: Wichita,
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Engine Selection ... Saito 72 or 82?
I have an Ultra stick 40 coming from the local shop, and I can't decide which powerplant to slap on the front of this bad boy. I know Hangar 9 reccomends either the Evolution 46 or the Saito .72, but the 82 is only 1oz more, and appears to have considerably more power. My only concern is, would the .82 have TOO MUCH power? I'm going to use the plane to practice what I've been doing on the simulator as far as hovering, torque rolls, harriers, etc. I also plan on doing the CROW mixing and quad flaps with single ailerons (since I only have 6 channels) although I'm sure I'll try quad ailerons with standard flaps at some point.
I also have a Hangar 9 Twist 40 that everybody reccomends the 82 for, so at least if I got the 82 and nuked the ultra stick, the Saito would still have a home.
Anybody try either of these combos? I'm sure either one will be awesome. But when spending 200-300 dollars on an engine, I want to make sure I make a very educated decision.
Also, a side note, the only difference between the std version and the Black Knight is the color, right?
Any help is appreciated.
Thanks,
-Eric
I also have a Hangar 9 Twist 40 that everybody reccomends the 82 for, so at least if I got the 82 and nuked the ultra stick, the Saito would still have a home.
Anybody try either of these combos? I'm sure either one will be awesome. But when spending 200-300 dollars on an engine, I want to make sure I make a very educated decision.
Also, a side note, the only difference between the std version and the Black Knight is the color, right?
Any help is appreciated.
Thanks,
-Eric
05-05-2006 | 11:47 AM
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From: columbus, IN
RE: Engine Selection ... Saito 72 or 82?
My personal opinion is that if you have worn out your trainer and understand throttle management the engines weight is the primary consideration. So in your case I would get the 82 if you know to throttle back on down lines etc to control max speed. The extra power will be sweet for up wards vertical flight.
Also as you mentioned the 82 will power more planes than the 72.
Happy Flying and don't forget throttle management
Also as you mentioned the 82 will power more planes than the 72.
Happy Flying and don't forget throttle management
05-05-2006 | 02:40 PM
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RE: Engine Selection ... Saito 72 or 82?
Cool, I'd say I'm pretty decent at throttle management. Not great, but decent. I always back off when coming out of loops and stuff to keep it from falling apart. My flying buddies who have been going about as long as I have seem to have yet to master this theory, lol.
Anyway, I read somewhere that the landing gear may not be big enough for the prop that the 82 will want to swing. Should I worry about this? I guess I could put taller landing gear on it but I don't really want to. Plus, I will probably be building the airframe while trying to sell stuff to afford the engine lmao.
Thanks for the quick reply by the way!
-Eric
Anyway, I read somewhere that the landing gear may not be big enough for the prop that the 82 will want to swing. Should I worry about this? I guess I could put taller landing gear on it but I don't really want to. Plus, I will probably be building the airframe while trying to sell stuff to afford the engine lmao.
Thanks for the quick reply by the way!
-Eric
05-05-2006 | 04:00 PM
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From: Glen Burnie, MD
RE: Engine Selection ... Saito 72 or 82?
I have the saito 82 and love the engine. I am curently looking for a new home for it and have run into issues with prop clearance as you can only go so small. To do the 3d manuevers you will want to run something like a 15x4 which will probably hit the ground. The smallest prop they rec. is a 12x8 which this engine will really swing and be pretty fast flying and landing?
05-05-2006 | 04:36 PM
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RE: Engine Selection ... Saito 72 or 82?
I am running a Saito .82 on an US 40 with an APC 14x4W prop. Bend the stock gear in a little bit for more prop clearance. With flaps deployed it will blast off the ground in just a few feet and go straight up out of sight. Overpowered?...yes...fun?...definately!
WCB
WCB
05-05-2006 | 08:52 PM
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RE: Engine Selection ... Saito 72 or 82?
Alright so 82 it is!!! That's what I wanted to hear anyway 
So I should probably start with like a 14x4 prop and just bend the gear to where it doesn't hit the ground?
Or should I get some US 60 landing gear to lift it up a little higher?
-Eric
So I should probably start with like a 14x4 prop and just bend the gear to where it doesn't hit the ground?
Or should I get some US 60 landing gear to lift it up a little higher?
-Eric
05-06-2006 | 07:31 AM
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RE: Engine Selection ... Saito 72 or 82?
I used the stock main gear with taller 2.5" foam wheels and bent the gear in slightly for a little more clearance. 3" wheels would probably work better. The APC 14x4W is a 3D prop and it produces gobs of thrust and will help keep the speed down. I've had mine for about a year and a half with well over 100 flights on it and never had a single problem. I had the US 60 (sold it to my brother) and in my opinion the 40 flies just as good if not better.
WCB
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05-06-2006 | 01:55 PM
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From: Wichita,
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RE: Engine Selection ... Saito 72 or 82?
The stock wheels are 2" right? I'll probabyl go with 3" wheels so I can do grass pretty well if necessary. We get a lot of crosswinds out here and the grass isn't so smooth. I try to land on the strip if possible but sometimes it's just beyond my piloting abilities, lol.
So as far as prop selection, where should I start? I mean, I'm not going to be doing a lot of 3D stuff, but I would like it to hover at like 1/2 throttle so i can have plenty of pull out when I get in trouble. On the other hand, I would like it to be moderately quick. I know it's not a pattern plane or a pylon racer, but I don't want it to be slow like a trainer. So any ideas on that?
Also, the only difference between the normal 82 and the black knight 82 is the color and gold plating, right?
Thanks again for all the help!!!
-Eric
So as far as prop selection, where should I start? I mean, I'm not going to be doing a lot of 3D stuff, but I would like it to hover at like 1/2 throttle so i can have plenty of pull out when I get in trouble. On the other hand, I would like it to be moderately quick. I know it's not a pattern plane or a pylon racer, but I don't want it to be slow like a trainer. So any ideas on that?
Also, the only difference between the normal 82 and the black knight 82 is the color and gold plating, right?
Thanks again for all the help!!!
-Eric
05-06-2006 | 03:22 PM
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From: Cypress,
TX
RE: Engine Selection ... Saito 72 or 82?
Flew my US40 quite a while with the Saito 72 (82 wasn't available yet). This combo was great with an APC 13 x 6. Had to add some tail weight to balance. No question - I would recommend the 82 over the 72.
05-06-2006 | 05:21 PM
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RE: Engine Selection ... Saito 72 or 82?
The APC 14x4W willgive you exactly what you are asking for... moderate speed and plenty of thrust to pull out of a hover. As far as props go it's a trade off. If you want a lot of speed you gotta give up some thrust and vice versa. The US 40 is not a 3D plane and it's not a real fast plane. It's more a sport plane. It will do some very nice flat spins,loops, rolls, snaps etc. and with the crow flap setup it is a hoot to dive straight down and land at your feet. Knife edges are a little tricky. It handles the wind real well and is a real fun all around good flying plane. You'll like it.
05-06-2006 | 06:14 PM
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From: Wichita,
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RE: Engine Selection ... Saito 72 or 82?
Sounds exactly like what I want. That 14x4W prop is expensive, so I hope it works out, lol. If I want more speed, I can probably go with a 14x6 or something to that extent?
As far as wind, YAY! I need something that handles wind. My twist is fun to fly and everything but it weathervanes like CRAZY. And I just gave my trainer to a buddy of mine so he can learn to fly. So yeah, this sounds like the PERFECT setup. I'll go with the saito 82 (probably the non-golden knight unless there's a reason i should get the golden knight) and a 14x4w apc prop. Now I just have to wait the 2 weeks for money to come in for the engine (unless I can get rid of some electric stuff sooner than that)
Thanks again for the help!
I'm sure I'll love the plane, it sounds AWESOME!
-Eric
As far as wind, YAY! I need something that handles wind. My twist is fun to fly and everything but it weathervanes like CRAZY. And I just gave my trainer to a buddy of mine so he can learn to fly. So yeah, this sounds like the PERFECT setup. I'll go with the saito 82 (probably the non-golden knight unless there's a reason i should get the golden knight) and a 14x4w apc prop. Now I just have to wait the 2 weeks for money to come in for the engine (unless I can get rid of some electric stuff sooner than that)
Thanks again for the help!
I'm sure I'll love the plane, it sounds AWESOME!
-Eric
05-06-2006 | 07:14 PM
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From: Virginia Beach,
VA
RE: Engine Selection ... Saito 72 or 82?
You've got to be careful using the 14x4W with the Saito 82 because it can over rev the engine. Again, throttle management is needed. A 14x6 APC is a much better choice for the 82.
05-06-2006 | 08:13 PM
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From: Glen Burnie, MD
RE: Engine Selection ... Saito 72 or 82?
A tach will help you tune it on the ground but that prop is not enough for 82, it will "unload" in flight and overrev the engine. I would stick with a 15x4 or a 14x6.
05-06-2006 | 08:15 PM
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RE: Engine Selection ... Saito 72 or 82?
So the 14x6 will give me enough pull not to overrev it? Or should I just start with a 15x4 to be on the safe side? I don't think it's going to have trouble pulling out of any hovering/torque rolling mistakes I'll make regardless of the prop. I just want to protect my 250 dollar engine 
Thanks again everybody! I'll be picking the plane up on monday.
-Eric
Thanks again everybody! I'll be picking the plane up on monday.
-Eric
05-06-2006 | 08:39 PM
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From: Glen Burnie, MD
RE: Engine Selection ... Saito 72 or 82?
15x4 will give you more static thrust, the 14x6 will give you more speed. You kind of have to decide which one flies the way you want to. I would start with the 15x4 but either prop is alot of prop and engine for this plane so take off will be short and direct, the 15x4 may help slow it down for landing.
05-06-2006 | 09:38 PM
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RE: Engine Selection ... Saito 72 or 82?
You are going to have issues with ground clearance with the 15" prop unless you go with taller landing gear and 60 size landing gear won't look right on it. That's why I suggested the 14". The 14x4W is fine for the .82 if you stay out of the throttle on the down lines (and it will work with the stock gear). I've been running that combo for a year and a half on that plane and my engine has stayed together. But if you are worried about it go with the 14x6.
05-07-2006 | 12:34 AM
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RE: Engine Selection ... Saito 72 or 82?
Actually, what about even a 14x7 or 14x8? I'm not going to have problems slowing down because I'm going to use the CROW mixing. I want to put as agressive of a prop on it as i can within reason. If I need it to calm down from there, I can go less agressive. I see that APC makes a 14x7, 8, 10, 11, and 12. It goes up from there but it's just rediculous. Should I even start with a 14x7 or 14x8?
Thanks again everybody. Without the assistance I'd be putting an evo 46 on it
-Eric
Thanks again everybody. Without the assistance I'd be putting an evo 46 on it
-Eric
05-07-2006 | 05:01 AM
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RE: Engine Selection ... Saito 72 or 82?
ORIGINAL: rccardude04
I have an Ultra stick 40 coming from the local shop, and I can't decide which powerplant to slap on the front of this bad boy. I know Hangar 9 reccomends either the Evolution 46 or the Saito .72, but the 82 is only 1oz more, and appears to have considerably more power. My only concern is, would the .82 have TOO MUCH power? I'm going to use the plane to practice what I've been doing on the simulator as far as hovering, torque rolls, harriers, etc. I also plan on doing the CROW mixing and quad flaps with single ailerons (since I only have 6 channels) although I'm sure I'll try quad ailerons with standard flaps at some point.
I also have a Hangar 9 Twist 40 that everybody reccomends the 82 for, so at least if I got the 82 and nuked the ultra stick, the Saito would still have a home.
Anybody try either of these combos? I'm sure either one will be awesome. But when spending 200-300 dollars on an engine, I want to make sure I make a very educated decision.
Also, a side note, the only difference between the std version and the Black Knight is the color, right?
Any help is appreciated.
Thanks,
-Eric
I have an Ultra stick 40 coming from the local shop, and I can't decide which powerplant to slap on the front of this bad boy. I know Hangar 9 reccomends either the Evolution 46 or the Saito .72, but the 82 is only 1oz more, and appears to have considerably more power. My only concern is, would the .82 have TOO MUCH power? I'm going to use the plane to practice what I've been doing on the simulator as far as hovering, torque rolls, harriers, etc. I also plan on doing the CROW mixing and quad flaps with single ailerons (since I only have 6 channels) although I'm sure I'll try quad ailerons with standard flaps at some point.
I also have a Hangar 9 Twist 40 that everybody reccomends the 82 for, so at least if I got the 82 and nuked the ultra stick, the Saito would still have a home.
Anybody try either of these combos? I'm sure either one will be awesome. But when spending 200-300 dollars on an engine, I want to make sure I make a very educated decision.
Also, a side note, the only difference between the std version and the Black Knight is the color, right?
Any help is appreciated.
Thanks,
-Eric
----------------
I had a Saito .72 that was a super engine. My interests changed, so, like most folks posting here, I sold it to help finance the latest project. Later, recently in fact, I needed a couple of four-strokes for about that size of model once again. I bought two .82s instead of the .72, which ran exceptionally well. Why? Because most 3D flying is done at partial throttle anyway, so why not have a little extra available when it is needed?
Prop selection is based upon a combination of factors, not just engine displacement. Today, fuel selection is just as important as the engine's size and the model's weight/drag. If you're running 30% nitro, you will need more of a load placed on the engine than if you were running 10 - 15% nitromethane.
While we can make pretty good estimates by factoring everything together, in the end, it is what the combination of model, engine and fuel tell us that determines the proper prop size.
05-07-2006 | 09:48 AM
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RE: Engine Selection ... Saito 72 or 82?
ORIGINAL: Artisan
----------------
I had a Saito .72 that was a super engine. My interests changed, so, like most folks posting here, I sold it to help finance the latest project. Later, recently in fact, I needed a couple of four-strokes for about that size of model once again. I bought two .82s instead of the .72, which ran exceptionally well. Why? Because most 3D flying is done at partial throttle anyway, so why not have a little extra available when it is needed?
Prop selection is based upon a combination of factors, not just engine displacement. Today, fuel selection is just as important as the engine's size and the model's weight/drag. If you're running 30% nitro, you will need more of a load placed on the engine than if you were running 10 - 15% nitromethane.
While we can make pretty good estimates by factoring everything together, in the end, it is what the combination of model, engine and fuel tell us that determines the proper prop size.
ORIGINAL: rccardude04
I have an Ultra stick 40 coming from the local shop, and I can't decide which powerplant to slap on the front of this bad boy. I know Hangar 9 reccomends either the Evolution 46 or the Saito .72, but the 82 is only 1oz more, and appears to have considerably more power. My only concern is, would the .82 have TOO MUCH power? I'm going to use the plane to practice what I've been doing on the simulator as far as hovering, torque rolls, harriers, etc. I also plan on doing the CROW mixing and quad flaps with single ailerons (since I only have 6 channels) although I'm sure I'll try quad ailerons with standard flaps at some point.
I also have a Hangar 9 Twist 40 that everybody reccomends the 82 for, so at least if I got the 82 and nuked the ultra stick, the Saito would still have a home.
Anybody try either of these combos? I'm sure either one will be awesome. But when spending 200-300 dollars on an engine, I want to make sure I make a very educated decision.
Also, a side note, the only difference between the std version and the Black Knight is the color, right?
Any help is appreciated.
Thanks,
-Eric
I have an Ultra stick 40 coming from the local shop, and I can't decide which powerplant to slap on the front of this bad boy. I know Hangar 9 reccomends either the Evolution 46 or the Saito .72, but the 82 is only 1oz more, and appears to have considerably more power. My only concern is, would the .82 have TOO MUCH power? I'm going to use the plane to practice what I've been doing on the simulator as far as hovering, torque rolls, harriers, etc. I also plan on doing the CROW mixing and quad flaps with single ailerons (since I only have 6 channels) although I'm sure I'll try quad ailerons with standard flaps at some point.
I also have a Hangar 9 Twist 40 that everybody reccomends the 82 for, so at least if I got the 82 and nuked the ultra stick, the Saito would still have a home.
Anybody try either of these combos? I'm sure either one will be awesome. But when spending 200-300 dollars on an engine, I want to make sure I make a very educated decision.
Also, a side note, the only difference between the std version and the Black Knight is the color, right?
Any help is appreciated.
Thanks,
-Eric
----------------
I had a Saito .72 that was a super engine. My interests changed, so, like most folks posting here, I sold it to help finance the latest project. Later, recently in fact, I needed a couple of four-strokes for about that size of model once again. I bought two .82s instead of the .72, which ran exceptionally well. Why? Because most 3D flying is done at partial throttle anyway, so why not have a little extra available when it is needed?
Prop selection is based upon a combination of factors, not just engine displacement. Today, fuel selection is just as important as the engine's size and the model's weight/drag. If you're running 30% nitro, you will need more of a load placed on the engine than if you were running 10 - 15% nitromethane.
While we can make pretty good estimates by factoring everything together, in the end, it is what the combination of model, engine and fuel tell us that determines the proper prop size.
Anyway, if you don't want to spend a bunch on several different props to try out maybe you could see if there are guys at the field that would let you try one that they have (in different sizes) and see how it works for you. You may even find that a 13" prop will work for you.
Also I wouldn't bother with a 15" on the set up that you are talking about. It's too much prop and you'll have clearance problems anyway. And yes you may want to get a tach. It's harder to tell your RPM with a four stroke.
