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MLD-28 gasoline engine

Old 03-25-2009, 08:30 AM
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Default RE: MLD-28 gasoline engine

Has anybody done any tests with a full tuned pipe, such as the ES Composite?

Regards,
Magne
Old 03-25-2009, 01:05 PM
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Default RE: MLD-28 gasoline engine

Steve,

Will you have engines for sale at Toledo?

Whats your booth number again?

Thanks[8D]
Old 03-25-2009, 11:11 PM
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Default RE: MLD-28 gasoline engine

Our booth number at Toledo is 241-243. We will try to bring some engines to the show.

Peace,
Steven Chao,
CERMARK.
Old 03-26-2009, 01:28 AM
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Default RE: MLD-28 gasoline engine

steven...if you take my backordered mld-28s to toledo, please make sure that anyone handling it doesn't drop it...lol...btw, your signature says, 'ceramrk'...fwiw, my ohio rc extra300L w/ 72-in one-piece wing is being prepared for the mld-28s...ken
Old 03-30-2009, 01:56 AM
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Default RE: MLD-28 gasoline engine

I can bring your b/o to Toledo, but can promise that it will not be handled by others. Definitely not dropped. A "FRAGILE" sticker guarantees damages. Let me know if you're totally certain that you'll be there. I'll also see if your b/o is being processed. My direct email is [email protected]. I am leaving around Tues/Wed. So gotta know so that I can stuff that into my suitcase.

For the rest of you wise guys out there my suit case will not fit a 25% airplane... So don't even bother.

Peace,
Steven Chao,
CERMARK
Old 04-02-2009, 05:20 PM
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Default RE: MLD-28 gasoline engine

I was able to take 12 oz off my AW Yak. It now weighs 9lbs 14.5oz. You saw the power the MLD 28 had in the 1st video, I cant wait to see what it has with the new weight. Its going to be a rocket (already was). Hopefully I will get to fly it Sunday or Monday.

Sneak preview of my new toy. Cermark SS-77 Edge 540, and SPE 43 combo (reconditioned SPE, looks brand new). A build thread, and review to follow pretty soon.
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Old 04-05-2009, 12:58 PM
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Default RE: MLD-28 gasoline engine

HAHA!! Shaved another oz off of it!! Now 9lbs 13.5 0z. Tried flying yesterday, but the 25 mph winds did not allow for much. What I can tell though, it flies like a totally different airplane. I did get to see that inverted flatspins are much nicer, and I didnt think that was possible. they were already awesome. Couldnt really do anything but fly around, way too windy and gusty. Roll rates into a 25 mph wind are insane, I couldnt count them. I'm pretty sure I'm at the point where I can not go any lighter without weakining the structure. I could put the SPE 26 back on and lose 2 or 3 more oz. NNAAHHHHHHHHHHHHHHHHHH!!!!!!!!!!!!!!!!!!!!!!!!! With the MLD 28, and under 10 lbs, and the 18x6 Vess, I go almost as fast vertically, as horizontally, and the vertical does not slow, as far as I can tell, was getting to high to see it.
Old 04-05-2009, 04:06 PM
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Default RE: MLD-28 gasoline engine

ORIGINAL: Jimeni

HAHA!! Shaved another oz off of it!! Now 9lbs 13.5 0z. Tried flying yesterday, but the 25 mph winds did not allow for much. What I can tell though, it flies like a totally different airplane. I did get to see that inverted flatspins are much nicer, and I didnt think that was possible. they were already awesome. Couldnt really do anything but fly around, way too windy and gusty. Roll rates into a 25 mph wind are insane, I couldnt count them. I'm pretty sure I'm at the point where I can not go any lighter without weakining the structure. I could put the SPE 26 back on and lose 2 or 3 more oz. NNAAHHHHHHHHHHHHHHHHHH!!!!!!!!!!!!!!!!!!!!!!!!! With the MLD 28, and under 10 lbs, and the 18x6 Vess, I go almost as fast vertically, as horizontally, and the vertical does not slow, as far as I can tell, was getting to high to see it.
hi jim...just wanna let you know that i've been following your posts, and i'm looking forward to doing something very similar...i considered getting the aw90-120, but i already have an ohio extra300L w/ 72" one-piece wing which was built from a kit and given to me...i'll use my backordered mld-28s w/ vess18x6s prop...btw, the ohio kit hasn't been made since '81 or so...
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Old 04-05-2009, 06:23 PM
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Default RE: MLD-28 gasoline engine

thats a nice looking bird especially being 30yrs old.
Old 04-05-2009, 06:25 PM
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Default RE: MLD-28 gasoline engine

Thats a great looking extra! The MLD 28 will jerk it around nicely.
Old 04-05-2009, 11:51 PM
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Default RE: MLD-28 gasoline engine

Talked with Steve at Toledo's Weak Signals, I showed up Saturday around 10:00 and told me he sold out all MLD-28s on Friday.

Guess I'll have to wait for mine a little bit longer.
Old 04-06-2009, 05:41 AM
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Default RE: MLD-28 gasoline engine

I'm now getting 7800rpm with a 17x8 jxf and converted to rcexl ignition. Just managed to get me a 11.11mm bore carb. Anyone tried this combo as yet? I haven't had the time to fire her up.
I'm really liking this engine.
Old 04-06-2009, 06:01 AM
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Default RE: MLD-28 gasoline engine

What size is stock carb,or wt #,thanks
Old 04-06-2009, 06:22 AM
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Default RE: MLD-28 gasoline engine

I tried that carb on the SPE 26, and it was awesome. I hear it does not do so good on the MLD, I plan to try it and the WT 540, upgrade carb for SPE 43, was too much for the 26 though. I got 8100 rpm with an 18x6 right out of the box stock and on 1st tank of fuel, your rpm's seem a little low.
Old 04-06-2009, 06:30 AM
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Default RE: MLD-28 gasoline engine

skip1320, dont know the model number, but I believe its a 10 mm, the 11 mm is a Walbro WT 391. Search Ebay, you can still find new in box ones, but the carb is no longer in production. usually around $10.00. But I hear it actually drops the hi end rpm on this engine, have not tried it my self yet, but I do have one. The WT 540 (13mm) may be the ticket.
Old 04-06-2009, 08:49 AM
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Default RE: MLD-28 gasoline engine

I have installed a WT433 in the MLD which is 11.11mm bore. I hope it does have some improvement. I wish I could get 8100 on an 18x6, that'll be great!

Does anyone know if boring out the carb adapter for the SPE43 will improve things? I've found that the adapter bore tapers down from the carb end to the engine exhaust where the bore is about 12mm.I have also replaced the carb in my SPE43 to a 13.56mm bore (WT731) but will that be negated by the 12mm adapter bore?
Thanks
Old 04-06-2009, 09:29 AM
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Default RE: MLD-28 gasoline engine

On the 43, I think it will be a choke point, but maybe not enough to matter. You could always try boring it out, and if it causes problems, get a replacement, they are inexpensive. Most likely it will only cause an increase in RPM's, or no change at all.

I have not even put a tach on the 28 since the 1st tank. I know it will be more now, but will worry about the next tach reading after break in when I can lean it out.

When I put the 11mm carb on the SPE 26, I got about 500 RPM's increase, and better throttle response. As far as the 28, at this point, I see no need to replace the stock carb. works great.
Old 04-06-2009, 09:46 AM
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Default RE: MLD-28 gasoline engine


ORIGINAL: togatoga

I'm now getting 7800rpm with a 17x8 jxf and converted to rcexl ignition. Just managed to get me a 11.11mm bore carb. Anyone tried this combo as yet? I haven't had the time to fire her up.
I'm really liking this engine.
that prop may also put more load on the engine and not let it rev up as high, if you can install a vess 18/6 and see were your numbers are and make sure that it is leaned out correctly and not running to rich or to lean. being over sea's is it possible that the fuel does not contain the same btu as american gas,{even with our strick emissions}
Old 04-08-2009, 02:08 PM
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Default RE: MLD-28 gasoline engine

Who has the 18x6 Vess props for sale, Also which Pitts style muffler is available, I will be mounting in a QQ Yak.

Ron
Old 04-08-2009, 02:55 PM
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Default RE: MLD-28 gasoline engine

http://www.jtecrc.com/spewraparound.htm for the pitts muffler there may be more just do a google search
http://www.vesspropellers.com/servle...ter/Categories you can get it directly from him, real great guy to deal with, i had placed an order and one prop was boxed wrong and he took care of it right away.
Old 04-08-2009, 04:33 PM
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Default RE: MLD-28 gasoline engine

Dont go with the Jtec, its way too expensive. Get the one from cermark. A couple of notes on the mufflers. Pitts looks better, and is quieter, but you will lose about 100 RPM or a little more with the pitts, and the side muffler is a little over 1.5 oz lighter.
Old 04-09-2009, 01:30 PM
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Default RE: MLD-28 gasoline engine

i'm still waiting for my backordered mdl-28, but follow mld28 threads to get the 'best' prop, servo, exhaust, info...a friend of mine had a pitts for his g20...it seems to be a perfect fit for the spe26/mld28...that led me to a tony clark header/pipe for the g20...pricey, but worth considering for someone with the need for more rpm/power...i'm partial to the 135-degree engine mounting on my nitro engines, so the exhaust fits in the tunnel...(deleted pic to avoid copyright)...ken
Old 04-10-2009, 04:55 PM
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Default RE: MLD-28 gasoline engine

Guys you should try this prop. I am getting 8500 rpm with it. It is a cheap 18x6 Chinese prop from PeakModel. Brand name is Hawk. I had an APC 18x6 and this pulls the plane just as good.
The price is just $9.17. It is shaped identical to the APC and is much lighter. I love it. http://www.peakmodel.com/index.php?m...roducts_id=395
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Old 04-10-2009, 05:58 PM
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Default RE: MLD-28 gasoline engine

Any ignition/timing issues at all?
Old 04-10-2009, 06:17 PM
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Default RE: MLD-28 gasoline engine

None at all.

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