THE NEW MT 57CC ENGINE

[Al Lewis]

Sounds like you're having a blast. Do yourself a favor and don't lean it out. The extra oil will help the engine last over the long run. Also go to a bigger prop, 24A or 23B, as you are spinning that engine up way too much. You should prop it for 7000 to 7300 tops. I would also go to a good 50:1 synthetic and run it at 40:1. I do with all of my engines. They already make more power then I need so why not baby them a bit. Enjoy!!

[mistydee0]

	Quote: Originally Posted by closetguy
	well i have been flying the nuts off the EF yak with the 57 in it.the engine must be getting broke in now because i am getting 7550 on a 23-A Vess,so 7000 on a 24-8 is possible i think?the engine has been running great also and so smooth and slow at idle,still running pennzoil at 32-1.the plug is a little on the dark side so i can lean it out a little more.it starts with two primers and one ignition, and one flip the rest of the day. i have been having so much fun with it that i broke the wing tube today doing walls, the third one is what did it. all i heard was a crack at the top of the wall then i new it was time to give it up.but i manage to get it back on the ground with out anymore damage to the plane. one nice engine i would buy another.

Hey closet guy,
Glad to hear you you are having fun. Thank you for working with the engine to get it to perform at the present level of performance. I think you should prop the engine to turn 7000 on the ground because when it is in the air god only knows how much that beast is running when it unloads. Also Soarrich bent his wing tube doing WALLS, he replaced it with carbon fiber and all is well now.


Larry, LS PRO ENGINES

[mistydee0]

I am glad to anounce that Kevin from DIETRICK PERFORMANCE AIRCRAFT has
joined the MT Team and has become one of our dealers. He will be handling the MT50, MT57 and the MT62. We are very pleased to have this Quality aircraft designer, on our team. His Extra 260 and our MT 57 will make a perfect combo. Kevin will have the MT57 shortly, as he bought my entire inventory. Glad to have you aboard Kevin.

Larry, LS PRO ENGINES


AIRBORNE RANGER

[Al Lewis]

So where's Ralph???

[mistydee0]

Doing R&D !!!!!

Larry, LS PRO ENGINES

[Al Lewis]

Why would he be doing R&D on an engine in production??? He designing a new one for you??? I would like to see his honest report on this engine. I'm damn sure his pilot has recovered from San Diego, cancer and amnesia by now. I can't even get him to answer my PMs.

[hughes500e]

I have to back up what Al is saying; I already bought an MT57 but, I won't be pushing the sale of them up here on the West coast until I hear from Ralph. He is an obvious icon for gas engines and his reluctance to post has to be assumed negative, given the time frame, it is quite unsettling!

Come on Ralph, give us a cookie, even a crumb

[wildhare]

It's entirely possible that Ralph is doing something else. What is important to you or me is not always important to others. I don't know the basis of Ralph's involvement, whether he's a paid consultant or a volunteer, but I suspect the latter and I doubt this is the item at the top of hi "to do" list. He also has a business to run.

Why don't you just pretend Ralph is not involved for the time being and do your own testing? I'm sure he'll get around to it.

TF

[AJT]

Larry
You are correct about the DIETRICK EXTRA 260 and the MT-57, I just maiden-ed mine yesterday. 16.5 lbs with a Can. Single 123 pack for Rx, lith-ion for IGN. Xoar 23/8. Motor runs smooth as any single I've owned. Throttle response is second to none, idle is great. Power is right up there. Had to fly most of my flights at half throttle to maintain a reasonable speed. Vertical is fast with no end in sight. No dead sticks no idle change after a 14min flight. I am very pleased with the MT-57 Just can't beat it for the price...! One thing I realised is I didn't need to choke after my first flight the motor started on the 3rd flip every time. I had no mid-range burble ( not used to that ) As for the DIETRICK EXTRA, it fly's very lite with this set up. A great combo. I've had many 50cc airframes to date this is one of the best so far, Right up there with my WILD HARE air frames, Who IMO has set the standard for the 50cc market. Sorry I didn't have any tach readings to report my batt went south. But what good are they anyway? What counts is flight performance, And like I said most of the time I was at 1/2 to 3/4 throttle. That's my report. Hope this helps someone on the fence.
AJT.

[closetguy]

Al, i was thinking the same thing about the RPM,s.i didn't know that Vess made a 24-A, but i will be looking into it though.this is the first Vess prop that i have tried and i really like the way they pull and spool up.and i just bought a gallon of Belray 50-1,that should last the summer.
you know that not all of us live,breath and eat RC hobby.Ralph is proubly doing something else who knows what?
after looking better at the wing tube i broke it on both sides of the fuse and it is a carbon tube,i guess i should count my blessings that i got it back on the ground before i made a lawn dart out of it.

[soarrich]

I went out to make my 33 pound thrust video yesterday, but try as I might it wasn't there. This really upset me because I got that before, I just reported the numbers not make them up. I went to my friend's house and ran the test there and figured out why I can't get it, this is the story.

The first time I did my thrust test I went out to the flying field it was cold and breezy I did my test and got 30~31 of thrust. I cut that day short because it was so cold standing in the prop-blast I was not having fun, since I retired if I'm not having fun I don't do it. A couple weeks later I went to the field to test because I knew no one would be there flying in was too windy 20+, but 60* so I figure a good day to test, I started it up got 33 pounds of thrust right off. I think the lowest reading that day was about 30 pounds of thrust, man the engine really broke in with a coupe days flying. Wrong, you can not run a thrust or rpm test with any wind at all. Jump forward to yesterday, I'm testing down under trees, it's blowing maybe 15 mph, but the no wind where we are under the trees, MOST of the time. I'm dieing just getting 26~27 pounds of thrust holding steady, then it would jump up to 29 pounds for 3~4 seconds, then back down to the steady thrust reading. The difference was just for a couple seconds we got a little puff on wind down under the trees. I does not take much of a breeze at all to really make you readings jump. If you're flying fast enough to fly, and pull up to do a Wall you're probably getting 33 pounds of thrust, it sure looks like it when you see the plane shoot up. The breeze affected the rpm readings also, but not at all as much as the thrust readings.

OK, now that you know any breeze at all will increase your results, this is what I got, you can add 2 pounds to the readings if you feel any wind on you at all, IE a normal day with 3~5 mph wind.

Using a header and MT's canister, which is smallish, but really sounds nice and mellow, this is what I got:

Vess 22A 7380 rpm 26.9 pounds of thrust.
Xoar 23A 6200 rpm 24.3 pounds of thrust.
NX 22x8 6900 rpm 25.0 pounds of thrust.
NX 23x8 6300 rpm 23.9 pounds of thrust.
NX 24x8 6000 rpm 23.9 pounds of thrust.

The Vess 22A thrust reading doesn't make sense to me, at that rpm before I pretty sure the thrust was higher. I broke my 23A Vess so I used my Xoar 23A. I flew with the Vess 22A, it makes the plane loud and it really unloads in the air. The Xoar 23A on the other hand reads low on the ground, but really comes alive in the air, I think the static rpm is just below the good spot on the power-band, in the air it unloads into the sweet spot in the power-band and really flys nicely. The NX 24x8 is one of my reference test props so I won't use it to fly, but I'll have to get some big props like that to try in the air.

[soarrich]

This is the MT canister, it's about 10 1/4" long, the can, and 2.4" diameter.