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Old Jan 21, 2013, 04:47 PM
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Hervey Bay, Queensland, Australia
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Merco "Black Streak" 49's and 61's

These engines from the mid to late 60's are still quite plentiful.

They run well on nil or low nitro fuel, and sound nice,but are not powerhouses by today's standards.
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Old Jan 21, 2013, 06:50 PM
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United States, OR, Portland
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Originally Posted by Reginald View Post
That opposed twin is a Chinese YUHE. I've got a set of new rings for it. Did have red anodised cyl.heads.
Yeah that's what I found out too.
Yuhe. Twinstar 40cc iirc
I think mine was some cheap copyright as it didn't have any brand or logo stamped on it or red cylinder heads
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Old Jan 21, 2013, 06:52 PM
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Quote:
Originally Posted by fiery View Post
These engines from the mid to late 60's are still quite plentiful.

They run well on nil or low nitro fuel, and sound nice,but are not powerhouses by today's standards.
Thanks for the tip, mine's missing the baffle plate
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Old Jan 21, 2013, 07:26 PM
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What about this?
It's a twin plug
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Old Jan 21, 2013, 08:16 PM
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twin star

Bill
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Old Jan 21, 2013, 09:54 PM
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Originally Posted by williame3590 View Post
twin star

Bill
alright..mine isnt a twin star then. probably some china knock-off of itself.
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Old Jan 21, 2013, 11:15 PM
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The windy west coast of Sweden
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More on "Black Streak"

Quote:
Originally Posted by fiery View Post
These engines from the mid to late 60's are still quite plentiful.
This is (AFAIK) the last version of the "Black Streak" series....the baffle is gone, replaced by a silencer, a different propdriver, carb etc...
I'm not quite sure of the age though.....1970's, or maybe even later...?

.
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Old Jan 22, 2013, 12:55 AM
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Belgium
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Originally Posted by murcielago View Post
alright..mine isnt a twin star then. probably some china knock-off of itself.
Yes your engine IS a Yuhe twin Star, you will find different carbs, Yuhe is specialised in drone engines and is Chinese. The day Chinese will copy Chinese is not there yet.
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Old Jan 22, 2013, 03:03 AM
Sticks, Tissue & old Diesels
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France, Centre, Amboise
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Quote:
Originally Posted by murcielago View Post


What about this?
It's a twin plug
I think it's just a fairly early (but not the first model) Merco 49 or 61 that's been slightly messed with.
Here's a new "first model". Yours is the same as this one, but with a twin plug head.
http://www.ebay.co.uk/itm/1308382339...84.m1423.l2649
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Old Jan 22, 2013, 06:37 AM
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Adelaide, South Australia
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murcielago's Merco is a 61 Mk2. The Mk1's had a single plug and I can tell it's a 61 because the lower flange where the cylinder seats on the crankcase is quite thick compared to a 49 which gives a height increase of 1/16". The Mk 1 and 2 are what's known as the light case Mercos, the Mk3 is known as the heavy case because of a strenghtening rib under the exhaust plus the backplate screw lugs extend all the way to the front of the crankcase. The heavy case crankcase was used on the later Black Streak 49 and 61's.
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Old Jan 23, 2013, 04:54 AM
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Originally Posted by brokenenglish View Post
I think it's just a fairly early (but not the first model) Merco 49 or 61 that's been slightly messed with.
Here's a new "first model". Yours is the same as this one, but with a twin plug head.
http://www.ebay.co.uk/itm/1308382339...84.m1423.l2649
how is it messed with?

Quote:
Originally Posted by downunder View Post
murcielago's Merco is a 61 Mk2. The Mk1's had a single plug and I can tell it's a 61 because the lower flange where the cylinder seats on the crankcase is quite thick compared to a 49 which gives a height increase of 1/16". The Mk 1 and 2 are what's known as the light case Mercos, the Mk3 is known as the heavy case because of a strenghtening rib under the exhaust plus the backplate screw lugs extend all the way to the front of the crankcase. The heavy case crankcase was used on the later Black Streak 49 and 61's.
ok, let me off-topic a little, i bought this muffler adapter with the aftermarket muffler from mecoa and chose the mk2 adapter but it doesnt fit mine at all and the company practically ignored my emails.

wait, are u refering to the engine i just posted or the black streak engine i posted earlier?
Quote:
Originally Posted by Reginald View Post
Yes your engine IS a Yuhe twin Star, you will find different carbs, Yuhe is specialised in drone engines and is Chinese. The day Chinese will copy Chinese is not there yet.
but it doesnt have the markings and wordings.
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Old Jan 23, 2013, 07:12 AM
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Originally Posted by Twin-Stack View Post
As Gluehand would say "Not exactly glow but......" Freshly stolen from another forum !
my god..

this is beautiful!

wish i can get my hands on one
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Old Jan 23, 2013, 08:40 AM
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Quote:
Originally Posted by Gluehand View Post
This is (AFAIK) the last version of the "Black Streak" series....the baffle is gone, replaced by a silencer, a different propdriver, carb etc...
I'm not quite sure of the age though.....1970's, or maybe even later...?

.
Bosse, I'm not an expert on Mercos, but here's my opinion anyway!
I purchased an engine like yours new, in 1978, and it's not a "Black Streak".
Firstly, your engine is a .35 (we're discussing 61s), and it's the version produced by Forest Engineering, that took over production from the original Merco company (immediately identifiable by the prop-driver).
The Black Streak engines were made by the original Merco company, i.e. they're earlier than yours, and the real Black Streak 29/35 engines (I used to own one) had a complex black carburettor, with a broad horizontal slide system. This carb is shown in Aeromodeller March 1971, page 134, which also dates the Black Streak series as being 6 or 7 years earlier than your Forest Engineering version.
The carb. shown in Aeromodeller is on a Black Streak 61, but the carbs on the 29/35 engines looked the same.
Brian
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Old Jan 23, 2013, 09:00 AM
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Originally Posted by brokenenglish View Post
Bosse, I'm not an expert on Mercos, but here's my opinion anyway!
I purchased an engine like yours new, in 1978, and it's not a "Black Streak".
Firstly, your engine is a .35 (we're discussing 61s), and it's the version produced by Forest Engineering, that took over production from the original Merco company (immediately identifiable by the prop-driver).
The Black Streak engines were made by the original Merco company, i.e. they're earlier than yours, and the real Black Streak 29/35 engines (I used to own one) had a complex black carburettor, with a broad horizontal slide system. This carb is shown in Aeromodeller March 1971, page 134, which also dates the Black Streak series as being 6 or 7 years earlier than your Forest Engineering version.
The carb. shown in Aeromodeller is on a Black Streak 61, but the carbs on the 29/35 engines looked the same.
Brian
But you sure do know about Merco's. Here are two engines where a basic Merco 61 was used. The 77 Special by Otto Bernhardt USA and the second by Stebro Engineering GB.
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Old Jan 23, 2013, 10:26 AM
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United States, OR, Portland
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how rare are the merco .61 ? black streak or normal ones, single or dual plugs.
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