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HomeAircraftHelicopterEngines Plugs Mufflers Fuel › OS55, B320 pipe bogging
10-24-2011 09:22 PM  6 years agoPost 1
Richardmid1

rrProfessor

Leeds, England

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Been used to E power recently but just got an N5 with OS55, Funtech B320 pipe, SAB 620 blades running on Optifuel 20SLV at 2100rpm and it doesn't seem to have the power that my old Hyper 50 had with Align pipe. However, ive never run 620's with 8.5 gear ratio, is this why it seems to load up alot? Im between 1 1/4 and 1 1/2 turns out on both needles.

I can try 600's or 30% fuel but im not sure which will make the biggest difference?

60% of the time, it works every time!

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10-24-2011 09:48 PM  6 years agoPost 2
airdodger

rrElite Veteran

Johnston USA

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Had the OS55 reg with same pipe. I was more open with the needles on the engine with the reg. The thirty nitro will help, don't expect electric type power. The 600 blades will also help. I did not like being limited to one gear ratio the same one you have, my opinion is it needs to changed so the engine can turn easier. The problem may come from the expert fliers prototype the helis but that is not necessarily good when we load the engine more and are not as gentle. Then we get the reply well look at so and so fly he does not have any issues, it must be you. Opinion about the pipe very no comment.

Chris

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10-24-2011 11:19 PM  6 years agoPost 3
RotorHead486

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England

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Get rid of those 620's Rich they are killing it!

Is the N5 Flybarred? If it is try a set of Radix 600SB's they suit it really well. If its flybarless try a set of Rail's, they are awesome!! Or a set of standard 600 Radix.

What sort of headspeed are you running?

One Reason For Crashing'Rogue Servo Bent on World Domination'!!
FLP Flight Team

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10-25-2011 03:10 AM  6 years agoPost 4
CoronaL

rrKey Veteran

Winnebago IL

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get your headspeed up IMO

I know alot of people say the rpm's should be about 17000, but I've found that motor to prefer 17,750-18,250 on that pipe depending on your flying style and tuning ability.

There's ALOT of power in that motor by tuning the mid. Not climb out power, but the transitional power like tic toks etc... The B320 is one of the, if not THE BEST pipe for that motor.

I'd also check the head shim. If it's shimmed for 30% you may want to run a slightly thinner shim.

Randy!!! I am the liquor

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10-25-2011 04:27 AM  6 years agoPost 5
dchekas

rrKey Veteran

Farmington, CT

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Running the OS55HZ w/ B320 on my Fury 55.... 11 Degrees cyclic pitch, and ~11 degrees collective and the motor pulls it like a champ. Wish I had a video.

2150 RPM, Fury 55, Rotor Rage 30%, Edge/Align 600mm Blades.

Team Align, Team Futaba, Team Byron Fuels, Team Thunder Power

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10-25-2011 10:02 AM  6 years agoPost 6
Richardmid1

rrProfessor

Leeds, England

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I know alot of people say the rpm's should be about 17000, but I've found that motor to prefer 17,750-18,250 on that pipe depending on your flying style and tuning ability.
Im at 2100rpm which is 17,850rpm on the motor.

Ross, yes its flybarred, forgot to mention that I forgot that everyone is FBL now! lol. Will try some 600's, the difference in price between 20% and 30% after 7 gallons will have payed for the 600 blades so running 600's will be cheaper in the long run than switching to 30%! + keeping the crash cost down!

60% of the time, it works every time!

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10-26-2011 10:33 AM  6 years agoPost 7
Richardmid1

rrProfessor

Leeds, England

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There's ALOT of power in that motor by tuning the mid.
Maybe I am too lean on the high and too rich on the mid?

I will try richening the high and play with the mid later....

60% of the time, it works every time!

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10-26-2011 08:46 PM  6 years agoPost 8
Ravenhyper50

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Canada's Capital

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I run the exact same motor/pipe combo...
If this helps any ...I'm running CY30% and 2 turns out from closed on both high and mid needle, stock factory on the low needle and in my area at this time of year I have loads of power for some wild 3D maneuvers.

The settings you were running would cook my motor fast if I went that lean.

Oh.. ya, running OS #8 plug

Raven

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10-26-2011 09:22 PM  6 years agoPost 9
CoronaL

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Winnebago IL

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If your temps are ok, and the motor sounds good then I doubt the high is too lean. Different fuels like the CY30% are thick oil packages will really effect how the needles will be "out".

I might bump your HS up to 2150, try the 600mm blades and report back.

The OS motor in stock form isn't IMO a very torquey motor, and swinging large blades, even on light airframes demands alot of torque. The YS is better, but can still bog a bit with SAB 620's which are very very power hungry blades. The OS seems to respond well to adding a few rpms and getting a good handle on the tuning will get you into the powerband then I think. Just don't overload it too much as it takes a bit longer to recover than the YS, but seems to have a bit more high end power, vs mid range grunt vs the YS.

Randy!!! I am the liquor

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10-26-2011 09:50 PM  6 years agoPost 10
Jeff polisena

rrElite Veteran

westpalmbeachflorida usa

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Try bringing HS around 1910-1930 max and re-tune ,motor is out of power band and by the time it falls into power loaded and cant recover so if you fall into power as you load you can fly just as good and feel power holding thru flight plus save wear and tear . I have no technical research or charts just trial and error .Try it you have nothing to lose.Fuel and equipment does make a difference but try what you got

I stole it ,flew it and gave it back ;)

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10-27-2011 08:05 PM  6 years agoPost 11
Richardmid1

rrProfessor

Leeds, England

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Ok ive just put a set of Align 600D's on and it has loads of power now!

Not sure about all 620's but the SAB 620's were killing the motor!

60% of the time, it works every time!

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10-28-2011 09:44 AM  6 years agoPost 12
gotnoclue

rrApprentice

sydney

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i was running the same engine and pipe combo last year running 620's banging 13 degree collective around till i would usually crash being too stupid. my 50 was a thrash machine
i was running rotortech blades though which i have always found to be very efficent, sabs to tend to be more power hungry in comparison.

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10-28-2011 01:47 PM  6 years agoPost 13
CoronaL

rrKey Veteran

Winnebago IL

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If you want to try larger blades again

I'd recommend:
Compass 615mm blades---very similar to Align 600D in how the collective and cyclics feel. You'll get a slightly different feel, as the disk is bigger, so it won't be quite as fast cyclic, and there will be a bit more load on the motor, but overall the feel is very similar. With the advantages of lower disk loading etc..

I hear the new Radix V2 fbl baldes are good, if you are FBL that is.

I'm sure there are a few others, but once I find a blade I like I tend to stick with it .

Randy!!! I am the liquor

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10-28-2011 02:06 PM  6 years agoPost 14
Richardmid1

rrProfessor

Leeds, England

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Thanks for that. I hear the standard Radix V2's are a cross between the old standard Radix and the SB's, is that right?

60% of the time, it works every time!

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