Notices
Gas Engines Questions or comments about gas engines can be posted here

MLD-28 gasoline engine

Old 03-09-2009, 07:21 PM
  #126  
 
Join Date: Jun 2007
Location: somewhere, OH
Posts: 566
Likes: 0
Received 0 Likes on 0 Posts
Default RE: MLD-28 gasoline engine

installed the 3w 18/8 prop just to see what it would do. i got 7600 rpms out of it but the thrust was down to 15lbs, plus the throttle response wasn't as good as the xoar. i need to order my vess props but should be right were jimeni is on his mld 28. only took about 4-5 flips to start. really an easy engine to set up and run.
Old 03-09-2009, 07:23 PM
  #127  
 
Ralph White's Avatar
 
Join Date: Feb 2007
Location: Neoga, IL
Posts: 615
Likes: 0
Received 2 Likes on 2 Posts
Default RE: MLD-28 gasoline engine

Thanks Jimeni, I check it out.
Ralph White
Old 03-09-2009, 08:09 PM
  #128  
Senior Member
My Feedback: (5)
 
GMoneyPit's Avatar
 
Join Date: May 2005
Location: Albuquerque, NM
Posts: 303
Likes: 0
Received 0 Likes on 0 Posts
Default RE: MLD-28 gasoline engine

I strap [link=http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXB889&P=7]this one[/link] to my square metal gas can and it works great. The one mentioned above costs more but it is easier to crank.
Old 03-09-2009, 08:23 PM
  #129  
 
Ralph White's Avatar
 
Join Date: Feb 2007
Location: Neoga, IL
Posts: 615
Likes: 0
Received 2 Likes on 2 Posts
Default RE: MLD-28 gasoline engine

Thanks GMoneypit, That's the type I use for my glow fuel. They work fine, but I'm looking around to see what's available.
Ralph White
Old 03-09-2009, 08:28 PM
  #130  
Senior Member
My Feedback: (5)
 
GMoneyPit's Avatar
 
Join Date: May 2005
Location: Albuquerque, NM
Posts: 303
Likes: 0
Received 0 Likes on 0 Posts
Default RE: MLD-28 gasoline engine

I'm at 5300' and am running an OS 120AX getting 9000 RPMs with an APC 17x6. Is this engine comparable in performance? I'm curious to hear what kinds of numbers you guys get with this prop so I can compare. I could probably use a few more ounces up front too so this engine might be a nice replacement for my glow engine. Is anyone getting close to 9000 RPMs using an APC 18x6W because as I recall, that is about what I got when I was running my OS 160FX and that is the kind of performance I'm hoping for.

Thanks,
Gary
Old 03-09-2009, 08:39 PM
  #131  
Senior Member
 
Jimeni's Avatar
 
Join Date: Sep 2006
Location: West Carrollton, OH
Posts: 1,275
Likes: 0
Received 0 Likes on 0 Posts
Default RE: MLD-28 gasoline engine

Well, not even really started to break in, and its turning a Vess 18x6 at 8100 rpm. A 17x6 will be over 9000 easily. After break in I would think the 18x6 will be close to 9000. With alot more torque than the OS, faster spool up, cheaper gas, no mess on your plane, and so on.
Old 03-09-2009, 08:50 PM
  #132  
 
Join Date: Jun 2007
Location: somewhere, OH
Posts: 566
Likes: 0
Received 0 Likes on 0 Posts
Default RE: MLD-28 gasoline engine

theres a guy on FG that is claiming 9200 on a carbon prop 17/6 with his mld 28
Old 03-09-2009, 10:35 PM
  #133  
My Feedback: (1)
 
Join Date: Jan 2002
Location: Murrieta, Ca CA
Posts: 53
Likes: 0
Received 0 Likes on 0 Posts
Default RE: MLD-28 gasoline engine

Here are the results of testing yesterday I posted earlier......



Here are some results from my bench testing this morning.....there is no comparison between the two engines. I did the testing with the same prop (menz-s 17-6), same fuel (32:1 pennzol), same tach and same IR temp probe. Low and high needles were adjusted to smooth idle, transition and max -100rpm.

SPE-26.....end of first tank(16oz), 1900-7400 rpm, 210F-315F at the spark plug. It still won't start by hand...low compression....maybe after more breakin.
MLD-28....end of first tank(16oz), 1900-9200 rpm, 200F-295F at the spark plug. It will start easily by hand (one flip).

I'll need to prop the MLD up to an 18-6 to keep the rpms down below 9000 rpm. I was shocked that the MLD would out perform the SPE by this much.....I was expecting about 500 rpm, but not 1800 rpm on the top end. The timing was checked (28 BTC) on both engines. I'm at a loss as to why there's so much difference between the two engines.

Has anyone else had this much disparity between these two engines?

Larry
Old 03-09-2009, 11:19 PM
  #134  
tkg
My Feedback: (1)
 
Join Date: Jan 2002
Location: Riverton, WY
Posts: 3,114
Likes: 0
Received 0 Likes on 0 Posts
Default RE: MLD-28 gasoline engine

APC 17x8, stock muffler, 8200 rpm...20 min on engine
Old 03-10-2009, 12:10 AM
  #135  
Senior Member
 
Join Date: Jul 2008
Location: Edmonton, AB, CANADA
Posts: 136
Likes: 0
Received 0 Likes on 0 Posts
Default RE: MLD-28 gasoline engine

Hey everybody back from the old thing weather you should run your engine for break in at 100:1 well here is quote from a good friend. "I personally never use synthetic oil to break a engine in as the synthetic does not allow the moving parts to properly mesh together. It builds a barrier and you will never get the complete seal you need for good compression which in turns means horsepower." Now everyone here i assume knows hp means nothing because the formula is quite a mash between mechanics and its based upon torque and rpm but still he has a good point. Also my saying is if you need to run anything over 50:1 you need a bigger engine or the same goes for nitro that if you need to use a fuel with nitro content over 15% you need a bigger engine.

2 cents of advice

Colin
Old 03-10-2009, 08:34 AM
  #136  
 
Join Date: Jun 2007
Location: somewhere, OH
Posts: 566
Likes: 0
Received 0 Likes on 0 Posts
Default RE: MLD-28 gasoline engine

just got off the phone with the tech support at amsoil just to get the actual facts on breaking in a airplane 2 stroke engine. they said to break in using the synthetic oil, you don't need to use a mineral based oil to do the initial breaking in. infact the tech there had some rc airplanes in the past. the only thing that he said was to use normal gasoline 10% ethenol is fine. thats all that is here were i live so i don't know if thats the case anywere else. the oil in question was the sabre 100:1.
Old 03-10-2009, 11:56 AM
  #137  
Senior Member
 
Jimeni's Avatar
 
Join Date: Sep 2006
Location: West Carrollton, OH
Posts: 1,275
Likes: 0
Received 0 Likes on 0 Posts
Default RE: MLD-28 gasoline engine

I disagree with the "if you need that higher ratio, you need a bigger engine" statement. If you can safely get more power out of you engine, do it, a bigger engine will just add un needed weight.

As far as the AMSoil Sabre. Cermark did not just pull this out of their butt. This oil was designed to run at 100:1, while providing sufficient lubrication. They are not the first engine company either. It has been proven on other brands, including DA. None of the engines have had problems.

If you dont want to do it, dont do it. You dont have to run it on that ratio. Its just that you could.

Less mess, more power, and safe on your engine, its been proven. I've been using that ratio for almost a year now, no problems here.

I do however agree that engine break in might take longer, but people who know more than me say that at 100:1, it will not.
Old 03-10-2009, 12:11 PM
  #138  
Thread Starter
 
Join Date: Sep 2003
Location: Santa Fe Springs, CA
Posts: 285
Likes: 0
Received 0 Likes on 0 Posts
Default RE: MLD-28 gasoline engine

Clarification: We have tested done some not so scientific testing on 8 new engines with synthetics. They have all worked out beautifully. We would have done more, but it would be far too expensive for us. Secondly, AMSOIL assured us that they will back every engine that uses their Saber Professional properly. Properly is defined at 100-1. Of course one can thicken it slightly.

Your North American MLD-28 now comes with a premix package of AMSOIL for break-in purpose. The goal of the break-in is to alter your engine temerpature (go from HOT to COLD, and vice versa). So realistically speaking altering temperatures drastically with 1 gallon of fulel can proves to be better than idling through 4 gallons of fuel/oil mixture. Flying is fine, but again air cools the engine => more time required to break in the engine.

Please email us at [email protected] if you need the latest copy of our N. American MLD-28 manual. If you don't have velocity stack and other items with your MLD-28, then your MLD-28 may not have gone through authorized distribution and sales channels.


Peace,
CERMARK,
Steven Chao
Old 03-10-2009, 12:22 PM
  #139  
 
Join Date: Jun 2007
Location: somewhere, OH
Posts: 566
Likes: 0
Received 0 Likes on 0 Posts
Default RE: MLD-28 gasoline engine

steven is the velocity stack needed? i have one but i want to keep everything in the cowl so i left it off.
Old 03-10-2009, 02:32 PM
  #140  
Thread Starter
 
Join Date: Sep 2003
Location: Santa Fe Springs, CA
Posts: 285
Likes: 0
Received 0 Likes on 0 Posts
Default RE: MLD-28 gasoline engine

Velocity stack is only required if you need to maintain consistent airflow around the air-intake (carb's butterfly) or if you're experiencing excessive fuel spitting. Otherwise, the velocity stack simply makes the engine look MANLY in photos...


Peace,
Steven Chao,
CERMARK
Old 03-10-2009, 02:37 PM
  #141  
 
Join Date: Jun 2007
Location: somewhere, OH
Posts: 566
Likes: 0
Received 0 Likes on 0 Posts
Default RE: MLD-28 gasoline engine

ok thanks i don't think i need it then the only "spitting" i experienced was when the low speed needle was to rich. and the motor is in the cowl, it should be ok for airflow too.
Old 03-10-2009, 03:18 PM
  #142  
My Feedback: (11)
 
BarracudaHockey's Avatar
 
Join Date: Jul 2003
Location: Jacksonville, FL
Posts: 27,115
Received 368 Likes on 296 Posts
Default RE: MLD-28 gasoline engine

We aren't using one and aren't having any air related problems. Mine came with a bad carb but that's walboro's fault and Steven replaced it with one phone call.

I should have the review on the 25% yak and this engine submitted shortly but I'd have no problem recommending it.

I realize that I recieved the equipment from them for review purposes but based on my experience with them I'd have no problem spending my own money to do business with them in the future.
Attached Thumbnails Click image for larger version

Name:	Ec89944.jpg
Views:	33
Size:	534.2 KB
ID:	1154548  
Old 03-10-2009, 04:39 PM
  #143  
Member
 
Join Date: Aug 2004
Location: Spruce Pine, NC
Posts: 96
Likes: 0
Received 0 Likes on 0 Posts
Default RE: MLD-28 gasoline engine

Hey Gmoneypit, I have a Cermark Yak exactly like the one pictured above with an OS120AX and I also have Cermarks Edge 540 with the MLD28. The Yak flies great with the 120 OS and is smooth as butter and has good power for 3D flight. However the Edge with the MLD28 definitely has more power. It will hover at less than half power and has good pull out. I have about 2 gallons through my MLD28 and I am getting 8500rpm on a 18X6 Hawk wood prop. This is a inexpensive prop that I got from peak model and it is shaped identical to an APC. I definitely prefer the MLD28 over the OS120. It is cheaper, burns gas instead of glow, has more power and I have a cleaner plane at the end of the day.
Old 03-10-2009, 05:53 PM
  #144  
Senior Member
 
Join Date: Jul 2008
Location: Edmonton, AB, CANADA
Posts: 136
Likes: 0
Received 0 Likes on 0 Posts
Default RE: MLD-28 gasoline engine

What yak 54 is that looks to me like a Aeroworks, also what im saying about the engine breaking in ratio is that you don't need the extra power for that plane anyways (aw yak 54), and nitro at 30% a jug is like $60 which is cough* cough* a lot! Don't take my word for this but i don't believe Desert Aircraft encourages 100:1 for break in with amzoil sabre.

Don't blow a fuse im not getting angry and im not trying to start a fight.

later
Old 03-10-2009, 05:58 PM
  #145  
 
Join Date: Sep 2007
Location: Shipman, IL
Posts: 76
Likes: 0
Received 0 Likes on 0 Posts
Default RE: MLD-28 gasoline engine

antbody know what the operating temps should be?
Old 03-10-2009, 05:59 PM
  #146  
Senior Member
My Feedback: (5)
 
GMoneyPit's Avatar
 
Join Date: May 2005
Location: Albuquerque, NM
Posts: 303
Likes: 0
Received 0 Likes on 0 Posts
Default RE: MLD-28 gasoline engine


ORIGINAL: bluehawkbm

Hey Gmoneypit, I have a Cermark Yak exactly like the one pictured above with an OS120AX and I also have Cermarks Edge 540 with the MLD28. The Yak flies great with the 120 OS and is smooth as butter and has good power for 3D flight. However the Edge with the MLD28 definitely has more power. It will hover at less than half power and has good pull out. I have about 2 gallons through my MLD28 and I am getting 8500rpm on a 18X6 Hawk wood prop. This is a inexpensive prop that I got from peak model and it is shaped identical to an APC. I definitely prefer the MLD28 over the OS120. It is cheaper, burns gas instead of glow, has more power and I have a cleaner plane at the end of the day.
That's great info bluehawk, thanks!

Gary
Old 03-10-2009, 06:54 PM
  #147  
Senior Member
 
Jimeni's Avatar
 
Join Date: Sep 2006
Location: West Carrollton, OH
Posts: 1,275
Likes: 0
Received 0 Likes on 0 Posts
Default RE: MLD-28 gasoline engine

A little more info if anyone is interested. After 20 oz of gas, Vess 18x6 = 8100 RPM. Vess 17x6 = 8850 RPM. I put on the pitts muffler. It was getting dark and the tach would not read. Will get RPM's for pitts tomorrow. There was no noticable difference in pulling power, judging by my hand. There was however noticable difference in idle. Idle was better, and seemed to be smoother with the pitts. But the big thing, it cut the engine noise by what seems like half. Hopefully the RPM's are not reduced. But if its only by 200 RPM, I'll take it. The pitts is by far the winner by a long shot so far, the numbers will tell.
Old 03-10-2009, 07:00 PM
  #148  
Senior Member
 
Jimeni's Avatar
 
Join Date: Sep 2006
Location: West Carrollton, OH
Posts: 1,275
Likes: 0
Received 0 Likes on 0 Posts
Default RE: MLD-28 gasoline engine

The 100:1 break in suprised me too. As far as I know, Cermark is the only one saying to use it for break in. But it does seem to be working fine. I seem to be getting as much break in mess on the plane, as anyone using anything else. I havent flown my AW yak with the 28 yet, only the 26. Cant wait!
Old 03-11-2009, 11:01 AM
  #149  
My Feedback: (11)
 
BarracudaHockey's Avatar
 
Join Date: Jul 2003
Location: Jacksonville, FL
Posts: 27,115
Received 368 Likes on 296 Posts
Default RE: MLD-28 gasoline engine

Thats the Cermark Yak 54 25 percent scale series. Which I'm pretty impressed with as well.

The last paragraph of the review concludes:

The two questions I ask at the end of a review are:
1. Will I keep the airplane or pass it on? This one is a keeper. I've already taken it to one big event.
2. If I crash the review plane would I buy another one with my own money to replace it? Yes! I would get another one or try another of their 25 percent scale series without hesitation.
Old 03-13-2009, 07:53 PM
  #150  
Senior Member
 
Jimeni's Avatar
 
Join Date: Sep 2006
Location: West Carrollton, OH
Posts: 1,275
Likes: 0
Received 0 Likes on 0 Posts
Default RE: MLD-28 gasoline engine

Ok, got the 1st flight with the MLD today, and got some video. Please keep in mind. Just bought the camcorder 2 days ago, and this is our very 1st video, ever. Cold and windy, my son was shivering while filming with no tri pod, but did a good job , I think. I think we will be making top notch videos in no time.

Also with the pitts muffler, I only lost 90 RPM's. So the inverted pitts is the winner hands down. Didnt even have to modify the cowling. 18x6 + side muffler = 8100, 18x6 + pitts = 8010. The vertical with this engine and Yak, is considerably more than the SPE 26, when its broke in, look out. Still taking it easy in the air, nothing to major, but you can see the power.

Here is the video. http://rcuvideos.com/video/MLD-28-wmv

Thread Tools
Search this Thread

Contact Us - Manage Preferences Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.