"1/2 A" & "1/8 A" airplanes These are the small ones...more popular now than ever.

Webra Speed .12?

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Old 01-07-2008, 06:15 PM
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Duane-RCU
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Default Webra Speed .12?

I found one in a local shop, no help close by so I didn't get to look at it out of the box. Any idea on application (RPM, prop, fast or sport?)
I have an LR1, was thinking decent .15-.18, I want to keep it light, not over-power it. I have an old K&B .15 rear intake, but I may sell it, no muffler... Only about 38" wing span, I want to be able to see it!
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Old 01-07-2008, 06:31 PM
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Default RE: Webra Speed .12?

Try that K&B without the muffler! If you can't see it, you ought to at least be able to hear it!

Seriously, though, hope you learn something about the Webra .12.. surely someone has experience with one
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Old 01-07-2008, 06:46 PM
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Default RE: Webra Speed .12?

My Webra 1.5cc .09" spins a cox 7x3.5 over 17,000 and only weighs 110gms w/muffler - I have a diesel head for it and it spins an 8x4 at 12,000.
I like the engine a lot!
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Old 01-07-2008, 09:05 PM
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Default RE: Webra Speed .12?

Does your Webra .09 look like this one? Mine only does 9.8K on the 8 X 4
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Old 01-07-2008, 11:10 PM
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Default RE: Webra Speed .12?

The Speed .12 is supposed to live up to its name from what I've read here and there over the years. A screamer in it's day it sounds like it'll do what you're after.
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Old 01-08-2008, 07:39 AM
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Default RE: Webra Speed .12?

I've got one almost new in the box. Ran it 2X on the test stand. Even better I have the muffler which did not come with the engine. These things were pricey at $129.95 and that was over 10 years ago.
As to the Webra 09 diesel I havent run mine in over 20 years so I can't remember how much it turned. They are extremely well made typical German quality.
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Old 01-08-2008, 12:42 PM
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Default RE: Webra Speed .12?

If your .12 is anything like the Speed .61 and rear exhaust Racing .61 I used to run on pipes, you'll have a really nice engine there. My Webra's were some of the best and most reliable engines I've had.

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Old 01-08-2008, 04:58 PM
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Default RE: Webra Speed .12?

I might have to go back and take a look at this engine.
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Old 03-25-2008, 03:57 AM
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Default RE: Webra Speed .12?

with a little work O.S. .15 and magnum .15 will turn apc 7x5's at 20,000-21,000 and stock modified muffler no pipe's
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Old 03-25-2008, 06:41 AM
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Default RE: Webra Speed .12?

I have a 1.8cc Webra Speedy which came out around 1978. Nice engine. It has a Ball-bearing crank and rear exhaust. It came with a black crinkle finish pipe but a friend of mine wanted to see if it would fit in a boat he was building and lost my pipe.

I also had a Webra .12 but the original owner wanted it back.

The 1.8cc Webra had .38HP which was very good.

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Old 03-25-2008, 09:00 AM
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Default RE: Webra Speed .12?

Probably this model:
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Old 03-25-2008, 10:16 AM
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Default RE: Webra Speed .12?

Duane,

If you decide not to get PLEASE let me know where it's located, I'd love to have it.

Thanks,

Rick
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Old 03-25-2008, 10:27 AM
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Default RE: Webra Speed .12?


ORIGINAL: fritzke

Probably this model:

That is the correct motor, the Webra Speed 12 with optional muffler.
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Old 03-25-2008, 11:39 AM
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Default RE: Webra Speed .12?


ORIGINAL: airraptor

with a little work O.S. .15 and magnum .15 will turn apc 7x5's at 20,000-21,000 and stock modified muffler no pipe's

Not wanting to sidetrack this thread, so how about starting a new thread on the details; (specifics on the prop, fuel, & mods.) Even though at the top end for engines, on this forum, think that there would be some interest here. My Conquests (RC versions, not competition model) don't get those kind of #s on 10% nitro & 7x5 MAS prop. Hear a lot of talk about the XLS .15, but again, no specifics. .................... George K.
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Old 03-25-2008, 05:18 PM
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Default RE: Webra Speed .12?

An OS .15 turning a 7x5 at 21,000 rpm? Possibly the CVA. Off the shelf props are too heavy for .15s. They need wood or carbon props with stiletto blades to make max power.
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Old 03-25-2008, 05:27 PM
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Default RE: Webra Speed .12?

I had two Speedy 2cc (.12 cu.in.) engines for a ducted fan YF-22 project. As usual, I didn't get the project finished but I did do some bench running on the engine with a Macs tuned pipe and ducted fan. BOY that engine sure sounded beautiful when it came up on the pipe. Still have one of the engines and the nearly finished plug for a mold. Hopefully I will be able to find some time this year to work on it.
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Old 03-25-2008, 05:38 PM
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Default RE: Webra Speed .12?


ORIGINAL: mtntopgeo


ORIGINAL: airraptor

with a little work O.S. .15 and magnum .15 will turn apc 7x5's at 20,000-21,000 and stock modified muffler no pipe's

Not wanting to sidetrack this thread, so how about starting a new thread on the details; (specifics on the prop, fuel, & mods.) Even though at the top end for engines, on this forum, think that there would be some interest here. My Conquests (RC versions, not competition model) don't get those kind of #s on 10% nitro & 7x5 MAS prop. Hear a lot of talk about the XLS .15, but again, no specifics. .................... George K.
I'm interested to know what the Conquests are actually capable of - I have one, but with FAI FF venturi/NV assembly. It is unrun and has been gathering dust for many years in a box full of engines. It seems ideal for a small delta or speedy something or other. Mecoa indicated I could convert it to RC with the carb and muffler (yeah CP I hear you!! ) - I wasn't sure if the RC and FF versions had any internal differences, and from what I was told they don't (?). That being the case, I wonder what sort of prop loads the R/C version really would shine on. AFAIK the hot props for FF at the time were things like the Bartels fiberglass Cox 7-3.5 clone, that sort of thing. I thought the hot .15's were only turning them in the 21-23k regime but not 100% sure the exact numbers, maybe more. Have a similar vintage Chinese .15 too - forget the two letters, AD is it? I'd have to peek to recall (oh those lost brain cells). Maybe time to fire them up when the snow finally gets outta here.

7-5 is not a small load for a .15 - 21K is a lot of moxie for an engine that size.

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Old 03-25-2008, 07:57 PM
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Default RE: Webra Speed .12?

Lots of "word of mouth" info, on the Conquests, out there, but no telling what is real, & what ain't. Stuff that comes up most often; "trimed" 7x3.5 prop, 15% nitro, 21 to 23K. Cox instruction manual says 30 to 70% nitro for CL engine, & props from 6x7 to 8x4. RJL list same nitro for CL engine, & 5 to 15% for RC, depending on prop. (needs 155 deg exh timing to run "right" (had that in my notes, but don't know where I got it from, probably from RCU forums) Found one comment that the "early" CL engines had a more wild port timing than the RC version. Don't know if this is fact, or just an old wive's tale.....My #s; ......All my Conquests are RC version with the conventional head, & glow plug. All have the same carb (approx .229" ID), no pressurized tank needed. Only tached one of them. All props listed were/are unaltered, pre G3, MAS.. Fuel was 10% nitro, & 20% castor. 8x4 = 17,000.............7x5 =18,400..................... 7x4 = 21,400 . ............................. George K.
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Old 03-25-2008, 08:31 PM
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Default RE: Webra Speed .12?


ORIGINAL: mtntopgeo

Lots of "word of mouth" info, on the Conquests, out there, but no telling what is real, & what ain't. Stuff that comes up most often; "trimed" 7x3.5 prop, 15% nitro, 21 to 23K. Cox instruction manual says 30 to 70% nitro for CL engine, & props from 6x7 to 8x4. RJL list same nitro for CL engine, & 5 to 15% for RC, depending on prop. (needs 155 deg exh timing to run "right" (had that in my notes, but don't know where I got it from, probably from RCU forums) Found one comment that the "early" CL engines had a more wild port timing than the RC version. Don't know if this is fact, or just an old wive's tale.....My #s; ......All my Conquests are RC version with the conventional head, & glow plug. All have the same carb (approx .229" ID), no pressurized tank needed. Only tached one of them. All props listed were/are unaltered, pre G3, MAS.. Fuel was 10% nitro, & 20% castor. 8x4 = 17,000.............7x5 =18,400..................... 7x4 = 21,400 . ............................. George K.
Well that's a start - thanks. I wonder if the port timing is really the same between the balls-out venturi version and the R/C. If you are clocking 21,400 on a stock 7x4, that's not too shabby. The big jump in rpm from 7-5 to 7-4 may be normal but it seems to say high-rpm port timing to me. Good numbers any way.
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Old 03-25-2008, 08:44 PM
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Default RE: Webra Speed .12?

Whoa, there is a definited difference in the porting of the Cox Conquest FF and RC engines. Cox had separate part numbers for them. When K&B "Officially" took over the Conquest under their name the added a third liner for a special QM version. Looks like the FF/Speed engine but has a mini pipe and no spinner.

I have a parts breakdown sheet around here someplace for the Cox Conquests, maybe even the QM engine. I had one but Tim Dannels has it on display now in his Engine Museum in Denver.

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Old 03-25-2008, 10:32 PM
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Default RE: Webra Speed .12?

Well, you guys tweaked my curiousity enough that I had to start digging through some packed boxes. (halfway through a move, & most of my " stuff" is across country). Finally found the three (nearly) undisturbed boxes (K&B, COX, & RJL) with their un-run jewels & started to look for parts lists & #s.

RJL ....... lists all the diff carb/venturi & head parts, but only one piston/liner


COX does list two different piston/liner assemblies; one for the RC, & another for the CL version.


K&B list 3 engines, (RC, CL, & 1/4 midget). The same part # , 7990, is listed for each piston/liner assembly. They do mention that the CL engine has a higher Compr. Ratio.

Appears that there are a multitude of Conquest versions out there, plus all the Rossi/Conquest hybrids, & custom builder creations !!!!!!!!!!!!!!!!!!! ........................... George K.

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Old 03-25-2008, 10:39 PM
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Default RE: Webra Speed .12?

George,

Now I have to look for my Conquest stuff. I remember seeing the K&B parts list with three distinct part numbers for the CL/FF, RC and QM versions. I just moved so I'm not quite sure where that binder is at the moment but I do remember considering buying an extra QM sleeve because I anticipated it becoming a rarity.

I've seen parts lists vary on the same engine from year to year so anything is possible.
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Old 03-26-2008, 04:10 AM
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Default RE: Webra Speed .12?

combat these .15's are not stock. i said a little work. you will need a bigger carb dia., open the muffler up, work on the timing some. the timing is just a bit more than a cv. one of the O.S fp .15 in a house of balsa 190 does 142-145mph level run. its faster than my LR1 with stock O.S. 25 in it.

some guys run them with 9x3 wood props at close to 18,000.

i have a conquest QM version and its not really a strong engine copared to the ported .15's and way to heavy. If you want send me an email and maybe I could get you one.
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Old 03-28-2008, 09:07 PM
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Default RE: Webra Speed .12?

George,

Yup, you're right on the three K&B Conquests all having the same cylinder part number. I found my .15 book tonight and it appears that although Cox had two distinct liners for their RC and FF/Speed engines, K&B settled for just one for all three of their offerings. Don't know where I got the idea there were three separate cylinder liners.

Looks like the only difference was a choice of RC Carb or two venturis, standard finned head with std glo plug or the button type glohead. There was also a choice between spinner or standard prop nut and mini pipe or muffler.
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Old 03-28-2008, 09:49 PM
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Default RE: Webra Speed .12?

Didnt K&B and now RJL mecoa offer 2 piston/cylinder types , 1 iron/steel and the othe being ABC , check the parts availability on Meco's website.
Stewart
https://shop.mecoa.com/shopdisplayproducts.asp?id=105 , I also note that all parts for the conquest didnt interchange between Cox production and the K&B/RJL version
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