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HelicopterBergen R/C Helicopters › G26PUH Happenings
04-28-2004 04:00 AM  13 years agoPost 1
Wally

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San Diego, CA

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Hey Gang,

I put this motor in my Intrepid Gas two weeks ago to play with it and this thing is rockin'!

I felt the break-in on my previous G26 (airplane version) was quite prolonged, so I ran it initally pretty lean on oil (about 70:1) and just kept an eye on the temps.

This motor smoothed out quickly by 1 gallon so I am back to about 50:1 for another few gallons.

Another key change I think was the carb; I put a 603 on it straight away so I didn't have to even worry about that aspect.

So what's this puppy doing?

I am ripping 2000 HS and pulling +/- 11 on 710's (V-Blades)! The motor is smooth and humming!

I am not impressed with those new 677 carbs at all; it may have been the primary issue, as well as I think the G26 series may have a harder ring which has been taking it longer to smooth out... Or something...

Man, what a rocket ship!

The Big Wally

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04-29-2004 07:05 AM  13 years agoPost 2
seamuseg

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San Rafael, CA

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What temps you running?

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04-29-2004 04:35 PM  13 years agoPost 3
Gary Travis

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Utah

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Gasser Sucess

Well I've got the Intrepid gasser done and running great with the 260puh and can say that this combo is about the best gasser to fly if you want to 3d or just fly it like your grandma. It is super stable in a hover yet can come alive extremely quick the 260 has more than enough power to do whatever. Combine that with the great service from Bergen and you have it made. The 260 was a bit sensative to break in but well worth it. what amazed me with the Intrepid was the sability in a hover, it hovers like a trainer. for those wanting the 3d machine this is the one . Many thanks to the folks at Bergen.
Gary

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04-29-2004 05:09 PM  13 years agoPost 4
Wally

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San Diego, CA

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What temps you running?
Well, I've had tried a few readings here and there, and generally I'm trying not to see anything over about 225-240 or so.

But in all truth, I tune by ear and response since there is such a variation on temps with gassers.

You'll notice a distinct sag if you get too hot.

The Big Wally

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04-30-2004 03:38 AM  13 years agoPost 5
IncredibleITGuy

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Portland, Maine

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Yep

I agree on the sag Warren. There is a wide variety in temperatures being reported, that is for certain. Also depends on your environment, how well the engine is breathing in/out and other conditions.

Man I can not WAIT until tomorrow night. Hopefully the weekend I can get someone to film me putting the INT through some 3D.

How's it going over on your end warren?

ARGT : Glad it's working for you.. always nice to hear those happy reports... I have a lot of faith in what I have seen so far..

------------IITG------------

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04-30-2004 05:43 AM  13 years agoPost 6
Wally

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San Diego, CA

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How's it going over on your end warren?
All is going well!

Good progress on some secret gasser motor mods...

I have a G231PUH that I've gotten 14 ounces off off with some machining and ????...

Going to start flying it in a week or so...

Time to push the technology curve on these hefty beasts!

Also in the progress of fitting an MVVS 2.15 gasser on a highly modified secret airframe for some folks...

Lot's of neat stuff going on, and nice to be working with lots of very supportive people that finally appreciate my ideas and talents.

It's all great!

The Big Wally

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05-19-2004 06:24 PM  13 years agoPost 7
helibuzz

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Kings country

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Warren or Bill,

Whats your gear ratio? How many teeth on your intrepids pinion gear? i was wondering if you're using the 14 @6.43 ratio, motor rpm would be in the vicinity of 13000 rpms.(which is beyond the max torque range of this motor). Are you pretty much holding that rpm throughout all but extreme engine loading(maeouvers)?

Alex

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05-20-2004 01:37 AM  13 years agoPost 8
Chris Bergen

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cassopolis, MI USA

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Hey Alex,

At 1650 headspeed the engine is at 10,609.5. This is normal hover RPM.

At 1800 on the headspeed, your running the engine at 11,574.

At 2000 on the head you're at 12,860 on the engine.

What we are looking for is max power from the engine, not necessarily max torque.

We do offer different pinions for different applications, but I found for all around general flying, 3D, and stability from the engine, the 14 tooth was best.

I currently have a 12 tooth in mine, 7.5 to 1, running 810's at 1300 headspeed in a hover and 1450 for rocking and rolling, and it loves it . That did bring the engine RPM down about a 1000, but I also am running a little less pitch to compensate for a little less power.

If you need a certain gear ratio, say for a scale application, just let us know. Wer'e more than happy to build it the way you want it.

Chris D. Bergen

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05-20-2004 01:44 AM  13 years agoPost 9
Wally

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San Diego, CA

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I typically run the 14, the main is a 90, and the 26 is plenty happy at around 12k.

During my hardest flights (some fly harder than me though as I am pretty good at collective management and prefer a smoother look to my presentation) it shows a low of down to about 1850, probably from the climbing tic-tocs.

It's a beast.

The Big Wally

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05-20-2004 09:24 PM  13 years agoPost 10
helibuzz

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Kings country

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Hi Chris,

I met you at your shop when I dropped by June last year. Larry, your dad went next town to pick up some anodized stuff then. Anyway,
I originally had a 13 teeth pinion on my 1st Bergen w/ 720 blades.
Changed over to 14 w/700 and feels more responsive. Now using 14/700mm on both Intrepids, one w/ Hanson Stg1 g23 and other g231.
I discussed briefly w/ Larry the possibility of making a 15T pinion with my aim to bring the rpms into the peak torque range. (put in the back burner due to high initial cost).
Anyway, I'm expecting the arrival (end of this month) of the CNC mill I bought and will monkey around with different gear ratios.


Alex

Thanks Warren.

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05-27-2004 11:59 PM  13 years agoPost 11
Chris Bergen

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cassopolis, MI USA

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Hello Ade,

A few things to look for.

Did you dial indicate the fan in. You should be able to get it better than .002 runout on the fan hub. How is your alignment between the fan hub and the clutch?

How does your fuel look while hovering? Foaming or steady?

I haven't had the chance to try the CSM 560 in a gasser yet, but I do know the CSM 540 did not like gassers. Bob Johnston had a fix for it, something about putting in more delay. It's on his website.
What kind of foam or mounting tape is used with the 560?

Have you tried a different gyro?
We have had very good luck with the 401's especially now with the 9254 servo's.

If you're getting a lot of vibes it usually means it's running too lean already. where are your needles at?

What is your oil and mixture amount?

I'll be at the Chatanooga fufly this weekend, but will be at the shop Mon thru Wed. I'll keep an eye here for responses.

Chris D. Bergen

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05-28-2004 04:42 AM  13 years agoPost 12
Malorie

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Paw squared, MI

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Hey Chris,
We'll have to set up the video when you make it up here. My gasser is rockin'!! I LOVE my new throttle setup.

Can you say change-up hurricanes, funnels, climbing tic-tocks, tail drops, rolling circles, flipping circles, and a few other fun things?

See ya' Sunday/Monday,
Malorie

Life's a journey, NOT a destination.

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05-28-2004 05:55 AM  13 years agoPost 13
Wally

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San Diego, CA

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Give 'em heck Mal!

The Big Wally

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05-28-2004 06:06 AM  13 years agoPost 14
Chris Bergen

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cassopolis, MI USA

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I should be up there Sun night, and yes I'm bringing the camera!!

I hope to be marching with the VFW in the parade, so come on out Mon morning. After the parade, we'll go do some flyin'

Chris D. Bergen

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05-28-2004 08:16 AM  13 years agoPost 15
Chris Bergen

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cassopolis, MI USA

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What oil and mixture are you using? It makes a difference on where your needles should be.

Using a fully synthetic oil, at 5 oz per gallon, I usually start at 1 1/2 turns out on both the low and high needles. When adjusting the needles, always go richer first, let the engine adjust to the new settings(temps), then adjust some more. If the problem gets worse, then start to go leaner on the needles.

Chris D. Bergen

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05-28-2004 08:24 AM  13 years agoPost 16
seamuseg

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San Rafael, CA

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Most likely a balance issue from the sounds of it. If you got a good fuel/mix and close on needle settings then I would def. check out balancing on the blades main and tail. I have some vib. on the tail, but after hover it seems to smooth out. Let’s see if the same holds true after I get it all back together again.

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05-28-2004 01:40 PM  13 years agoPost 17
Malorie

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Paw squared, MI

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Remember that the G26 is about the same displacement as a 1.50 size (just a guess) glow engine, so yes you will see some vibes at an idle. You can also expect more vibes then a .90 glow throughout due to the large displacement.

Life's a journey, NOT a destination.

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06-05-2004 03:26 AM  13 years agoPost 18
Chris Bergen

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cassopolis, MI USA

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Where you want to measure the runout is at the top of the fan hub, from the side.

Remove the spark plug from the engine, Slowly turn the fan, looking for the highest point on your dial indicator. If you find any place higher than .002, you'll need to loosen the bolt holding the fan onto the engine.

Reloctite the bolt, and reinstall just snug. Find your high spot again with the dial indicator. Opposite of this point, sharply strike the tops of the fan with a small ball peen. Check the runout again. If it's ok, tighten down the bolt, and check the runout again. If it moved, strike it again. keep checking and tightening until your runout is less than .002.

Typically it only takes one good hit to bring it in to less than .002, and stays that way after final tightening.

We also have tools available to make this a little easier. A spanner wrench to hold the fan hub while tightening and removing the bolt, and a fan puller. The puller does double duty for the flywheel as well.

You do not want to jam the piston, or hold the opposite side of the engine while tightening the bolt. You can twist the crank, then you'll never get rid of the vibes

Chris D. Bergen

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06-06-2004 03:47 AM  13 years agoPost 19
Chris Bergen

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cassopolis, MI USA

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Verniers won't cut it, sorry.

Be VERY careful running the engine without a load on it.

It will overspeed very easily and trash the engine.

The engine will vibe some at idle, but smooth out as you throttle up.

If this is the vibe you mean, I wouldn't worry too much.

My father has been trying the 560 and not having much luck. It seems to act the same as the 540 in regard to gassers.

Chris D. Bergen

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06-06-2004 09:30 AM  13 years agoPost 20
Chris Bergen

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cassopolis, MI USA

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What does the engine sound like? Is the tail kicking in time with the engine 4 cycling?

The 540, and it seems the 560, are affected more by the vibes from the gassers. The 401 and 601 and even the JR 500T don't seem to be bothered.

See if a buddy might have a different gyro you can try, and see if your issues go away.

Chris D. Bergen

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