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ZoomsHobbies . HeliHobby . Ron’s HeliProz South

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Century Hawk - Falcon - Raven - Predator > New Hawk Pro - not lifting off the ground
 
 
thelane
Senior Heliman
Location: Edmonton, Alberta Canada

Well people, I have an issue with getting my Hawk in the air.. literally. Last year I crashed and rebuilt it, new OS37, everything. I had ALL my settings written down on a sheet and I am using the same radio settings now.

I have run 5-6 tanks of fuel thru this new engine and it's now ready to tune, but I can not tune it for some reason. If it's a bit too rich, it can not even lift off, I lean it out and it quits running 5' off the ground.

My idle screw is exactly 1 turn out and the mixture is 1.5 turns out. The pitch and throttle curves are all ok as far as I can tell because they are the same as last year. No holes in the lines, fuel filter is not plugged.

The settings I have in the radio are the same settings I used all of last year, same pipe, same fuel.

Any idea's?


Thanks,
Lane

JR Vibe 50 and DX7
05-20-2008 06:47 AM
 
 
cassat
Veteran
Location: Alberta,Canada

Heard this one before.
Are you using the muffler from your OS 32SXH you ran before??
05-20-2008 07:11 AM
 
 
thelane
Senior Heliman
Location: Edmonton, Alberta Canada

Its the muffler that comes with the Hawk Pro. I am using the newest one, not the original from last year.

JR Vibe 50 and DX7
05-20-2008 07:13 AM
 
 
thelane
Senior Heliman
Location: Edmonton, Alberta Canada

I never had an OS32. I had an OS37 last year and this is a new OS37.

JR Vibe 50 and DX7
05-20-2008 07:15 AM
 
 
thelane
Senior Heliman
Location: Edmonton, Alberta Canada

OK, going to try the setup help from Raptor Tech. in a couple days when I could get out. If anyone has an other links to good setup/tuning help for the OS37, let me know please.

~Lane

JR Vibe 50 and DX7
05-20-2008 07:19 AM
 
 
Blade_Master1
Key Veteran
Location: Canada

Lost Post's

Since RR went down a lot of posts were lost
so here I go again

(1) turn out the low idle screw till it is flush with the engine casing then turn it in 1 full turn.

(2) turn in the high end needle all the way but not tighen then turn it back out 1.5 turns

now your back to the factory settings

(3) hover your heli for a few mins and check engine temp with your finger you should be able to hold it there for at least 10 seconds with out burning it

(4) adjust your low end so the transition from low to high is smooth
you may need to lean the low end a little

the stock pipe IMO doesn't provide enough pressure to keep a good mixture setting.
when you can afford it get a better pipe I am using a Toki pipe and find the difference is like night and day NO More fuel problems either.

another thing to check are the washers in the blade grips in the proper sequence small washer larger washer nut.

after breakin in the engine change out the glow plug.


hope this helps
but I really hope RR doesn't lose our posts again


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JM2C's :)
05-21-2008 12:31 AM
 
 
thelane
Senior Heliman
Location: Edmonton, Alberta Canada

Hey, thanks a lot for posting again. Very much appreciated.

I will try this. Currently I have the low-end needle flush with the carb. I thought this was factory. That is probably my problem right there.

Anyway, we have rain ALL week here so I may not get to try this for a while.

~Lane

JR Vibe 50 and DX7
05-21-2008 02:01 AM
 
 
bellecrank
Veteran
Location: Canada

When you assembled the head, you may have installed the two washers that fit between the two feathering spindle nuts and the outer radial bearings.

The smaller one goes against the bearing and the larger one against the nut.

If they are reversed, the outer race of the bearings will bind against the large washer and lock up the collective movement as soon as the rotor starts to get up to speed. So even if you get enough power from your engine, you will not get enough pitch to lift off.

As for mufflers. The stock black muffler is best for use with the older OS32. For use with the OS 37, you are best to go with the reltively inexpensive CN3037 muffler that is specially designed for it...big power difference and a lot quieter.
05-21-2008 06:56 AM
 
 
thelane
Senior Heliman
Location: Edmonton, Alberta Canada

Thanks. I am going to check everything that is being suggested here, but I thought I would post my findings to-date. We are having bad weather here this week so I won't get to try anything until next week.

Anyway, so far, I found the following:

Number 1:
I did use my old tank from last year and when I pulled it apart last night I noticed that the pressure tube coming from the muffler is cracked and the curve was not pointing up; it was pointing down.

Number 2:
For whatever reason, I forgot to put the fan shroud in. Someone at the field last week even mentioned it and that even thou I was running a bit rich, the engine was hot. Not sure how much difference the shroud makes, but if the engine is overheating, you will lose power. I even looked at it when he said "isn't there supposed to be a shroud here" and I said "no, that's the way the Hawk is designed" DUH

Number 3:
The flybar paddles were exhibiting some significant pitch at center stick. I have now zero'd everything and corrected this.

So... all that is left is to check those washers in the head and properly tune the engine I think.

PS:
I know everyone hates the stock muffler and no doubt the others are better, but I used the stock muffler all year last season and it worked great. Never had issues with it. I do want the other century muffler, but only because it's quieter and chrome

JR Vibe 50 and DX7
05-21-2008 01:47 PM
 
 
Blade_Master1
Key Veteran
Location: Canada

Quote 
PS:
I know everyone hates the stock muffler and no doubt the others are better, but I used the stock muffler all year last season and it worked great. Never had issues with it. I do want the other century muffler, but only because it's quieter and chrome


LOL

If you find the Century pipe to quiet get a TOKI pipe.
Nice and LOUD but works very well

those other things you found would certainly affect flight performance

JM2C's :)
05-21-2008 02:10 PM
 
 
SuperSixTwo
Senior Heliman
Location: Lockwood, NV

I flew two seasons with the stock hawk mufflers. I did see an improvement of power (can you say that with a 37??) with the 3037, but it isnt a day/night kinda thing. More like, wow the motor didnt bog as far during a loop.
05-21-2008 03:34 PM
 
 
Blade_Master1
Key Veteran
Location: Canada

SuperSixTwo
Quote 
I flew two seasons with the stock hawk mufflers. I did see an improvement of power (can you say that with a 37??) with the 3037, but it isnt a day/night kinda thing. More like, wow the motor didnt bog as far during a loop.


Try a toki pipe

JM2C's :)
05-21-2008 08:57 PM
 
 
SuperSixTwo
Senior Heliman
Location: Lockwood, NV

Send me one and i'll post a review of it!
05-22-2008 12:33 AM
 
 
Blade_Master1
Key Veteran
Location: Canada

Wish I could afford to send you one

But for now just take my word for it, I used the stock pipe last season and was about ready to give up on nitro.

This year I lucked out on Ebay and got a Toki pipe with a couple of Hawks and a new OS37.

Since using the Toki pipe with a OS37 I haven't had any issues with fuel mixture.
My Custom Raven 30 performs as though it has a 50 in it.

The Toki pipe has exceeded my expectations I truly endorse the use of this pipe.

Unleash the Raven in your Hawk get a TOKI !




.

JM2C's :)
05-22-2008 03:13 AM
 
 
Ravenhyper50
Senior Heliman
Location: Ottawa

Quote 
My Custom Raven 30 performs as though it has a 50 in it.


You really need to fly a Raven with a OS Hyper .50 in it....because you would withdraw that statement.

MSH Protos 500, SWIFT 550 Carbon, Swift 620SE, DX-7, JR servos
05-22-2008 04:00 AM
 
 
Blade_Master1
Key Veteran
Location: Canada

Nah I've seen Ravens with 50's not that impressive for the size of blades to weight ratio
Lots of noise but ....

Unleash the Raven in your Hawk get a TOKI








.

JM2C's :)
05-22-2008 04:44 AM
 
 
thelane
Senior Heliman
Location: Edmonton, Alberta Canada

hey! You guys are hijacking my thread

JR Vibe 50 and DX7
05-22-2008 05:13 AM
 
 
Mutt
Key Veteran
Location: t ca usa

Set the fuel misture right and the pitch and throttle curves right it will fly. I have used the stock pipe with the .37 with no issues ever a friend of mine still does and has no issues. Only reason I dont run it anymore is mine broke so I went with the century pipe dont remember the part number gith off I see not much of a difference. so 40 for one compared to 15 for the other. FOr some the expense is not worth the cost.
05-22-2008 12:51 PM
 
 
reaper31
Senior Heliman
Location: denver, CO, usa

i had the same type of problem as well, i was using 20% fuel with that stock muffler and it would not take off, i switched to 30% and it now has power to spare even with my fuse on it! this was an OS32 though, but it might help.
05-24-2008 07:32 AM
 
 
Mutt
Key Veteran
Location: t ca usa

I use 15% in my helis with no issues sounds like your mixture is off and or your pitch curves.
05-24-2008 02:12 PM
 
 
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Century Hawk - Falcon - Raven - Predator > New Hawk Pro - not lifting off the ground
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