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NGH 38CC 4 stroke

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Old 05-27-2018, 12:05 PM
  #1601  
Charley
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Hello all,Quote:Originally Posted by earlwb
Nice,let us know how it goes. Post some pics too. Everyone loves pics.
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Dunno what RCU SW is up to. Happy it accepted the post at last

Tried to run it this morning. Name:  confused.gif
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Size:  1.1 KB All I got out of it was an occasional pop as my starter spun it. Name:  mad.gif
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Size:  1.0 KB So I pulled the plug and grounded it to the case; got an occasional anemic spark. My fault, I was trying to use some old 1A to 2.3A batteries that I dug out of the old stuff. bin. Now began the parade of old, recently recharged receiver batteries. Pop, pop...... I finally found a 4.8V, 1600mAH pack I'd made up last year from Rayovac cells. It showed signs of life so I put it onto the charger. While waiting for the charger I wasted time checking other things. Name:  rolleyes.gif
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So it's getting hot in the side yard, there's a pool party going on over the back fence and the charger hasn't beeped but WTH; I hooked up that old 1600 pack and she fired right up! Yippee! It would rev up and idle but was pretty loud in an enclosed space with the straight pipe. So after about a minute I shut it down. There was a thunderous silence from the pool party area! Then I heard, "WTH was that?" I figured that was enough for the holiday!

So I put everything away for the day. At least I know it runs and I need fresh batteries. The more I spin it the better the compression gets. I have some A123s form an old DeWalt power pack. I bought that pack when A123s were new in the hobby. Made a 4 cell pack just to get familiar with them. That pack will still fly my Super Sportster EP after all these years.

Anyhoo, going to make a 2 cell LiFe pack for the NGH ignition. I'm going to buy some new batteries also.

Attached is a pic of my engine stand,

CR

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Last edited by Charley; 05-27-2018 at 12:08 PM.
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Old 05-28-2018, 07:39 AM
  #1602  
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If you plan to use Life, do yourself a favor and use a regulator. Even though they claim to work with 8.0 volts, there are still guys having them fail on Life. For me, sticking with good ol reliable NiMh 5 cell 2000 mah packs for the Ignition, as have not had a single issue with them and they are not expensive either.
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Old 05-28-2018, 03:41 PM
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Originally Posted by acdii View Post
If you plan to use Life, do yourself a favor and use a regulator. Even though they claim to work with 8.0 volts, there are still guys having them fail on Life. For me, sticking with good ol reliable NiMh 5 cell 2000 mah packs for the Ignition, as have not had a single issue with them and they are not expensive either.
Well, the RCE ignition I have is model A-02, says on it 4.8v/8.4V. My fully charged 2 cell LiFe battery is 6.9V, so it's in the usable range along with the 5 cell NiMH for allowable voltage. After 1/2 hour of running today, it's down to 6.72V, no load, after several hours at rest.

No argument with you however, I tend to stay with the NiMH cells because they can be charged in the model, unlike the LiPos that lots of folks want to use. But the A123s can be charged in the model too and I already have them! I'll order some new batteries for the airplane, probably 6V NiMH for the flight pack and 4.8V NiMH for the ignition. The RC Excel gurus say that the spark isn't any hotter if one runs over 4.8V. I have no data that says otherwise so........

CR

Last edited by Charley; 05-28-2018 at 03:47 PM.
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Old 05-28-2018, 04:00 PM
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Originally Posted by timmybeetle View Post
NGH 38

Test update:
Today I tested APC 18X10 on my NGH38, sadly not performance I had hoped for.
RPM 6400-6500 and static trust 5Kg, on datasheet from apc they give this information also.
Put my 18X10 3 blade back rpm 6000 and static trust 5,5Kg.
I will leave it this way, it's to expensive for me to buy all kind of props for testing and get more Satic trust out of it.
Maybe I will test it one day without muffler and just a exhaust pipe.
grts Hans
Hi Hans,

I finally got a couple of sustained runs out of my GF-38. At full throttle with a 18X10X2 wood Zinger prop, the engine RPM was about 6,000. This with the open pipe and on 20:1 break in fuel, 91 octane, no alcohol. My test altitude is ~1700 feet MSL. Temp 80* F, H ~35%. I suspect the 18X10 is too much prop right now.

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Old 05-29-2018, 01:05 AM
  #1605  
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Originally Posted by Charley View Post
Hi Hans,

I finally got a couple of sustained runs out of my GF-38. At full throttle with a 18X10X2 wood Zinger prop, the engine RPM was about 6,000. This with the open pipe and on 20:1 break in fuel, 91 octane, no alcohol. My test altitude is ~1700 feet MSL. Temp 80* F, H ~35%. I suspect the 18X10 is too much prop right now.

CR
Hello

Thanks for info.
But I think you need 95 octane fuel, and a 18X8 brake in prop.
In my german manual they say it;s better to mount engine on plane, when it runs stable fly with it, it's better for cooling and heat built up for cylinder head.
at the moment I fly my plane with 3 blade 18X10 Mejzlik prop, just need a long start run, but it flies great and landing are now out of the book ha ha.
maybe I try octane booster, just to get some more RPM during start? If I do I report about my findings.

keep us updated.

grts Hans
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Old 05-30-2018, 12:07 PM
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Originally Posted by timmybeetle View Post
Hello

Thanks for info.
But I think you need 95 octane fuel, and a 18X8 brake in prop.
In my german manual they say it;s better to mount engine on plane, when it runs stable fly with it, it's better for cooling and heat built up for cylinder head.
at the moment I fly my plane with 3 blade 18X10 Mejzlik prop, just need a long start run, but it flies great and landing are now out of the book ha ha.
maybe I try octane booster, just to get some more RPM during start? If I do I report about my findings.

keep us updated.

grts Hans
Hans,

Ran it today on a 18x8 MA Scimitar prop, which is a narrow blade compared to the Zinger. Tached ~6500 RPM, still on the break in fuel with open pipe, conditions about the same as last time.

Unless your engine is detonating on the fuel you're using, you won't get more power by increasing the octane. I wish I could get 95 octane pump gas but it isn't available here. Highest is 92 and that's 10% ethanol.

I'm going to put the HK muffler on before I run it again. It barks like a nitro engine. Maybe I ought to ritchen it up a bit; the exhaust is pretty dry but the plug is black.

I'm flying blind here. What does everyone think?

CR
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Old 05-30-2018, 11:00 PM
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Hi Charley

Maybe after a few tanks of gas you must improve RPM.
Just check you'rs valve clearance.
I adjusted my timyng less pre ignition ( I gess around 35degrees now)
Hope you will get some better RPM out of the 18X8 prop, on youtube there are video's and they reach 7400RPM?????

grts Hans
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Old 05-31-2018, 06:39 AM
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NGH GF38 Four Stroke
I have about 1.5 gallons through the NGH GF38 so far, Timing reset to 28-30 deg BTDC, Stock short open header, 30:1 Klotz gas burner in 91 octane no ethanol gas;
Static test:

Master Airscrew 20x8 Wood 5500 rpm
Xoar PJA 20X8 Wood 58-5900 rpm
Xoar PJA 20X6 Wood or
Xoar PJA 19X8 Wood 6500 RPM

Hope that helps. I have been flying it on an 80" ugly stick. Good power for general sport flying. If you want to serious Aerobatics it should probably
go on a little smaller airplane (75"?). I have a lot of years in RC but this is my first gasser. Interesting but a real learning curve from Electric or glow.

D.H.
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Old 07-26-2018, 04:22 PM
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Test since deleting folder.

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Old 09-05-2018, 11:12 AM
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Thinking about putting one of these on a 86 inch Phoenix Stinson Reliant. I get good top end power. Xoar 18-8 7400 RPM. Valley View 19-8 7000 RPM. Valley View 20-8 6700RPM.( I think the Valley View wood props are same as Falcon.)
My only complaint is that below 2000 RPM vibration amplitude increases significantly. At 1700 RPM it really has the shakes.
So ...I'm looking for suggestions on how to smooth out the idle. Maybe check valve clearance, Use higher octane fuel. Retard timing a bit. Anyone out there have success in smoothing out their idle?
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Old 09-05-2018, 11:16 AM
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try to retard the ignition, it will help.
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Old 09-07-2018, 08:10 AM
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Originally Posted by tyor View Post
try to retard the ignition, it will help.
Thanks tyor,

Did the following and it seemed to help reduce vibration and the shakes at idle:

Smaller diameter prop. Reduced size from 20-8 to 19-8.
Retarded ignition a little which lowered top end by 200 RPM.
Used 93 octane gasoline.

Still have sufficient power, I think, for 18 pound Phoenix Stinson Reliant. With 19-8 prop now doing 6850 RPM.
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Old 10-19-2018, 10:44 AM
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Does anyone know if these engines are still available? I purchased one a while back from ValleyViewRC but they aren't carrying them anymore and it seems like whoever I check with, the engine is out of stock.
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Old 10-19-2018, 11:09 AM
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It may have been replaced with the 30CC.

https://www.agaperacingandhobby.com/...?productid=929

Glad I got the pair I did when I did now that they are no longer available, not even from HK.
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Old 10-19-2018, 11:50 AM
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Originally Posted by John Sohm View Post
Does anyone know if these engines are still available? I purchased one a while back from ValleyViewRC but they aren't carrying them anymore and it seems like whoever I check with, the engine is out of stock.
Pricey but still listed on Ebay. D.H.
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Old 10-19-2018, 02:07 PM
  #1616  
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Default Ngh gf-38

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Old 10-20-2018, 05:32 AM
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Don't think the 30 replaced the 38.
Two are different displacement and power
Still available from https://www.justengines.co.uk
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Old 10-20-2018, 08:12 AM
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Originally Posted by mchandrayan View Post
Don't think the 30 replaced the 38.
Two are different displacement and power
Still available from https://www.justengines.co.uk
It replaced it in the line up, the 38cc is more than likely discontinued now. I guess you didn't click all the way through on that site you listed because they are also out of stock. HK has been out of stock for over 6 months now. They are usually the first to get them too.
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Old 10-21-2018, 04:57 AM
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Yes, saw that later that Just Engines are also out of stock.
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Old 01-10-2019, 12:18 PM
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Hi,
just got mine from justengines.uk
scrolled all pages,
thanks for the tips, (checked all, and moved HAL sensor to min advanced position around 25-28°, as much as plastic holder would let, maybe I can make holes in it a few mm longer so it can slide more..., it was like 40ish° stock!)

running happily, looking forward to trying it in FW190

youtu.be/wEXL8iZ-lY0
youtu.be/r8A5d3lT85Q


it has 60min on 3000 rpm, consumes around 220 ml /h , insane!
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Old 02-09-2019, 12:22 PM
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Here's it in FW190 taxiing for now

youtube.com/watch?v=EOnpLEQY8vw
youtu.be/Jd9JFyNqxZw

Last edited by dr.tom; 02-09-2019 at 11:24 PM.
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