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HelicopterOff Topics Planes and Jets › The official plank thread.
08-11-2010 12:33 AM  7 years agoPost 921
tryan02

rrProfessor

Canton, Missouri

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I keep saying it but its true. go 30% or 35% and you will never get bored.
Stop it I am trying to stay satisfied with my 25%er's!!!

Oh but my clipped wing aerobatic taylorcraft is less than 25% but it is giant scale at 85" wingspan and although its not the hottest plane in the sky. I love flying it, smooth slow predictable aerobatics then turn the smoke on? I just cant explain that feeling you gotta do it.

So I do know how amazing the big planes are.

No Really I am the club President!!!

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08-11-2010 01:37 AM  7 years agoPost 922
Alek1024

rrNovice

corona, CA 92879

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bigger flies better....quarter scale only sounds big.....30% Extra lands, 50" Extra just stops flying.

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08-11-2010 01:52 AM  7 years agoPost 923
tryan02

rrProfessor

Canton, Missouri

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30% Extra lands, 50" Extra just stops flying.
Even with 25% 72" extra I learned what it means to fly one all the way in.

No Really I am the club President!!!

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08-11-2010 03:07 AM  7 years agoPost 924
Spitfire1

rrElite Veteran

Perth Australia

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I need to get a larger plane as quik as possible, just a 50 size will do me.

Its still early days but Im haveing real trouble flying this little PA Addiction, last night I could feel a gentle breeze on my face but it was still very scary, its only good for hovering and harriers in no wind at all.

Ive been looking at the Sebart 50 size planes like the Wind S.

but in there specs there talking about useing APC 16x10E or 16x12E
prop with 70 amp escs, the electronics I have Im up into the 80 amps range on 5 cell and 100 amp range on 6 cell with only a 14/7 prop.

I may be able to increase the prop if I use 5 cell, but dont know how much, the props they recomend for the plane seem extreme considering how fast my other 50 size planes were useing 14/7 props.

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08-11-2010 03:57 AM  7 years agoPost 925
airboss

rrElite Veteran

OC ,california

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Sebart is a great plane , Itaian design and high quality build.

Urukay HPS3 KSE 700 HPS3

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08-11-2010 04:34 AM  7 years agoPost 926
Spitfire1

rrElite Veteran

Perth Australia

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They look nice, just a bit concerned about the prop there recomending, the motor and esc I have on 14/7 seems to have insane speed and power, cant see why there recomending up to 16/12.

Think I will just try it on 14/7 with my power system on 5s, either that or just buy another like I had before.

My motor and esc with the 14/7 apce pulls 104 amps on 6 cell lipos, so going to a 16/10 is out of the question, possibly if I just run 5 cells I may be able to, but 16/10 or 12 seems very big.

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08-11-2010 05:44 AM  7 years agoPost 927
airboss

rrElite Veteran

OC ,california

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lots of the pros like to use the higher pitch prop for better airflow over the control surfaces during high alpha, and it gives a sudden snap when needed . they rarely run at full throttle and if so only for a couple seconds . with that prop the planes controls might flutter if pushed to full speed.

Urukay HPS3 KSE 700 HPS3

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08-11-2010 06:44 AM  7 years agoPost 928
Spitfire1

rrElite Veteran

Perth Australia

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Jeez, Ide realy love one but looking around the Miss Wind 50e bi plane is $470 just for the kit, and Im still trying to find somewhere here that sells the Angel model to get the price, $350 I could maybe scrounge together but $470 for the Miss Wind is a lot of money.

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08-11-2010 12:08 PM  7 years agoPost 929
ACKopter

rrApprentice

Florida

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This ones not designed electric but I'm sure could be converted, or just fly it glow and go! Its a 70's vintage pattern ship and I'm sure it will handle the wind with little to no problem.
http://www.hangar-9.com/Products/De...?ProdID=HAN4755

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08-11-2010 03:32 PM  7 years agoPost 930
koppter

rrApprentice

Virginia

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larger diameter higher pitch props are used to keep speed consistent -maneuvers present much better when they flow, rather than being rushed. larger diameter gives better braking on downlines, and higher pitch gives a lot of bite on verticals, which allowing for throttle moderation on horizontal lines. it's the same reason that long stroke 2c or 4 cycle engines became the norm in pattern - and 16/12 is a "pattern" prop.

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08-11-2010 10:25 PM  7 years agoPost 931
tryan02

rrProfessor

Canton, Missouri

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larger diameter higher pitch props are used to keep speed consistent -maneuvers present much better when they flow, rather than being rushed. larger diameter gives better braking on downlines, and higher pitch gives a lot of bite on verticals, which allowing for throttle moderation on horizontal lines.
I have been toying with that idea on my little 3D profile. It is a tribute 36 I am using a helicopter OS32xh with 30% heli fuel. Therefore I have plenty of RPM and power they recommend an 11x4 prop on the horizon hobby evolution 36 I have been thinking 12x6 on my os32. It is fine with 3D flight but a bit unpredictable need a little altitude to recover from a complete stall. You can watch it hesitate climbing out of a hover taking a while to wind up. I blame it on the low pitch.

No Really I am the club President!!!

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08-12-2010 12:56 AM  7 years agoPost 932
SSN Pru

rrElite Veteran

Taxachusetts

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call me a liar, but, I'd claim that long stroke 4-strokes became the norm in pattern because they could generate tremendous torque to swing these nearly over-square props and do it QUIETLY. that's in addition to the reasons above. I remember all the hardcore pattern guys at competitions at my field always striving to make their ships quieter.
I have been toying with that idea on my little 3D profile. It is a tribute 36 I am using a helicopter OS32xh with 30% heli fuel. Therefore I have plenty of RPM and power they recommend an 11x4 prop on the horizon hobby evolution 36 I have been thinking 12x6 on my os32.
Tyran, you'll smoke that little 32 with a 12-6. an 11-4 is MAXIMUM for a 36 and that'll provide GREAT low speed thrust and low top end speed. You'll lug the engine so bad it'll work too hard, stay low in it's power band and overall just be a dog. the 2-strokes aren't like 4-strokes or electrics. They just don't have much torque.

The OS32 is not an engine with high torque output. It's designed to swing a small to medium size mid-range pitch prop fast.

Stupidity can be cured. Ignorance is for life!

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08-12-2010 11:39 AM  7 years agoPost 933
tryan02

rrProfessor

Canton, Missouri

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Tyran, you'll smoke that little 32 with a 12-6. an 11-4 is MAXIMUM for a 36 and that'll provide GREAT low speed thrust and low top end speed.
I was curious what prop was too much like I said its a heli motor it has a higher RPM than a plane motor. I dont know what prop is too much for it. This motor used to swing a 48" rotor with 12 degree pitch. Through a few gears and a clutch of course.

No Really I am the club President!!!

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08-12-2010 12:14 PM  7 years agoPost 934
SSN Pru

rrElite Veteran

Taxachusetts

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The OS .32 SXH has an upper practical rpm limit of 22,000 rpm. It's power peak (1.2 bhp) is at 18,000 rpm. If you lug the engine down with a bigger prop then it won't be making good power. I'd prop that engine with a 9X5 to start. It'd probably swing a 9X6 pretty good if you wanted higher speed. You could always go to a 9x4 too.

The point is, you want that engine to turn fast because that is what it was designed to do.

Even in your heli, the engine was geared to be in it's power band. Typically, heli gearing gears the engine to turn ABOVE it's peak power band. For example, the optical gearing for the OS 32SXH would have the engine turning probably 20,000 rpm in an idle up hover. That way, when you apply pitch (and increase the load on the engine) the rpms back off a few thousand and the engine enters it's peak power band which helps it maintain the speed. If you were already hovering with the engine at it's peak and you applied load, the engine would put out decreased horsepower. That's not what you want.

Lastly, the torque curve on these small 2-strokes looks like mount everest - that is, they rise sharply to a peak and fall off quickly. 4-strokes and electric motors have much flatter torque curves, comparably, where they provide generally good torque across the entire rpm range.

Does that make sense? Sorry for being long winded.

Stupidity can be cured. Ignorance is for life!

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08-12-2010 10:11 PM  7 years agoPost 935
tryan02

rrProfessor

Canton, Missouri

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Well then you have convinced me to stick with the 11x4 I have on it now. I couldnt climb out of a hover with 15% nitro so I went back to 30% heli fuel with it now it will climb out but it is a little hesitant.

No Really I am the club President!!!

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08-12-2010 11:21 PM  7 years agoPost 936
SSN Pru

rrElite Veteran

Taxachusetts

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put a 10X4 on it. That will allow the engine to spin up faster.

an 11X4 is a good high thrust low forward speed prop for a .40. It's too much for a .32.

Stupidity can be cured. Ignorance is for life!

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08-13-2010 03:20 AM  7 years agoPost 937
tryan02

rrProfessor

Canton, Missouri

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an 11X4 is a good high thrust low forward speed prop for a .40. It's too much for a .32.
The .32/30%nitro is just as fast as other guy's same plane with evolution 46 15%nitro.

Its the talk of the club OS32 has better performance than evolution 46 and can start it with just a couple hand flips

No Really I am the club President!!!

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08-13-2010 03:46 AM  7 years agoPost 938
airboss

rrElite Veteran

OC ,california

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I just installed my Xoar 27/12 , this gives my 3W 6100 rpm and the sound when it unloads screams in your your ears ,acceleration from hover is like a shuttle launch. my engine just did a factory tune up
and was bench tested at 7000rpm with a 26/10 wood. Gerhard cleaned it up installed new gaskets and sent it back. tomorow should be maiden if I can get away.been grounded for 2 1/2 weeks too long .

Urukay HPS3 KSE 700 HPS3

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08-13-2010 12:22 PM  7 years agoPost 939
SSN Pru

rrElite Veteran

Taxachusetts

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evolution 46
Teh evolution line of engines aren't the greatest. They were designed with beginners in mind. That means easy starting, good running, etc. What that equates to is lower than average power.

The OS.32 definitely is a powerhouse for it's size at 1.2 BHP at 18,000 rpm.

Stupidity can be cured. Ignorance is for life!

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08-13-2010 06:26 PM  7 years agoPost 940
airboss

rrElite Veteran

OC ,california

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all the glow engines YS ,OS ,Saito , ect were very reliable and lasted years. my favorites are the YS 4st and the Saito 4st engines , maintenance is an issue but the torque is unbeatable for spinning big props. one of the guys picked up a Magnum170 4st from hobby-people and its a powerhouse, only drawback is they run best on high nitro fuels like heli mix ,$$$$$$$.
be giving you guys a report on the Sbach maiden later this evening.

Urukay HPS3 KSE 700 HPS3

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 113 pages [ <<    <     45      46     ( 47 )     48      49     NEXT    >> ] 99415 views POST REPLY
HelicopterOff Topics Planes and Jets › The official plank thread.
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