| Title: | Welcome To The Radio Control Conference |
| Notice: | dir's in 11, who's who in 4, sales in 6, auctions 19 |
| Moderator: | VMSSG::FRIEDRICHS |
| Created: | Tue Jan 13 1987 |
| Last Modified: | Thu Jun 05 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 1706 |
| Total number of notes: | 27193 |
Well this will probably be my last entry in this conference, as June
30th will be my last day as a Deccie.
Over the past year or so I have been soliciting information on large
glo and gas engines, but did not really get much information. By
reading the rc_models.rec conference and having direct experience
with both the ST3000 and the O.S. BGX-1 I can provide some real data
which may help future noters make an informed decision.
ENGINE PROP RPM
****** **** ***
ST3000 20x6 ZINGER 7000
ST3000 18x8 Zinger 7000
OS BGX 20x6 ZINGER 7400
Zenoah G62 22x8 Zinger 7000
This is real world data, from modelers like you and me, not taken from
any magazine tests.
The OS BGX and the ST3000 both weigh about 60 oz. with muffler and
radial mount. The G62 with isolation mount and starter spring weighs
over 90 oz.
The Vibration level of the ST3000 and BGX is WAY LESS than the G62.
The BGX starts by hand on the first or second flip every time as does
the ST3000. The BGX idles extremely well and we have not yet had a
dead stick with it. It is running uncowled with the stock muffler that
came with it. Everyone is amazed how quite it is. In the .rec file
the BGX has been maligned for quitting, presumably due to overheating
and restrictive mufflers in scale, cowled applications. I can't speak
to this, but run out in the open it is dead reliable.
I still like the gas engines but feel you must design/build your plane
with vibration in mind.
The BGX-1 with muffler and radial mount cost $300, I believe the G62
with isolation mount and spring starter will set you back at least
$500. The BGX is nearly as powerful and at least 2 lbs lighter.
You can buy 20 gallons of fuel with the $200 you save on the BGX.
THis translates to 65 24 oz. tankfuls which will provide at least 10.5
hours of actual flying. After this the Gas engine is obviously much
cheaper to run.
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 1672.1 | Zenoah g-62 specs. | CTUADM::MALONE | Always Obtuse | Tue Jul 18 1995 14:15 | 26 |
I have recently purchased a Zenoah G62 for my 1/5 scale Sea Fury under
construction. I have posted the manufactures' specs here for
comparison. I have not run the engine as of yet,(fear factor-this is big)
but expect to over the next month. The cost is right on the money
with the last note appox. 500.00 U.S.
Specifications: (from the Owners manual)
Model: Zenoah G620PU-1
Type: Air cooled two stroke gasoline engine
Displacement: 62.0 cc (3.78 cu. in.)
Bore and Stroke: 47.5 mm x 35 mm (1.87 in x 1.38 in)
Compression Ration: 8.2 : 1
Max. Output: 5.4 PS/10000 rpm [4.7 PS/10000 rpm with muffler]
Operating rpm: 2000 ~ 10000 rpm
Weight: 2.0 Kg (4.4 lbs) [2.3kg (5.1 lbs) with muffler]
Ignition system: CDI type Flywheel magneto
Carburetor: WALBRO HDA-48C
Fuel: Gasoline oil mixture 20 ~ 25 : 1
Spark Plug: Champion RCJ-7Y
Recom. Prop sizes: 22 x 6 ~ 8, 20 x 7 ~ 10, 18 x 8 ~ 12
Rod
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| 1672.2 | 2 stroke vs. 4 stroke | CSLALL::ONEILL | Fri Aug 18 1995 14:40 | 8 | |
I hope this question isn't a duplicate to one asked else where but here
it goes. Can someone provide the comparison of power between two and
four stroke engines. For example, and correct me if Im mistaken, but
to replace a .40 two stroke, you need a sixty four stroke. A recent
ad for the dynaflite PT19 calls for a 1.20 four stroke and up. What
size two stroke could be used in place of that?
Jim
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| 1672.3 | Some thoughts | SNAX::SMITH | I FEEL THE NEED | Fri Aug 18 1995 14:51 | 13 |
A few years ago, your assumption would have been correct. Today,
however, 4 strokes and 2 strokes are pretty equal. Replacing a 40
2 stroke with a 45/50 4 stroke is plenty now a days.
A 1.20 4 stroke can be replaced (power wise) with a Super tiger 2500
or maybe the OS 1.08. What you'll have to pay attention to is engine
WEIGHT and SIZE. If a plane is "designed" for a particular engine, you
may not have the "room" for a larger engine or if heavier, you may not
be able to attain the correct CG without adding a ton of weight.
Best course of action would be to call someone at Dynaflite (or get
technical advise from the distributor) and see if they recommend a
particular 2 stroke engine.
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| 1672.4 | Poor Man's 1.20 | WMOIS::WEIER | Keep those wings spinning! | Fri Aug 18 1995 15:15 | 6 |
A Super Tigre .90 two stroke is also an ADAQUATE power plant for
a 1.20 sized plane in most cases, although if you can afford it ( and
can fit it in the plane), the OS 1.08 is a MUCH nicer AND more
powerful engine.
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