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Heli-Max . Scorpion Power System . Ron's RC Helicopters
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Thunder Tiger Raptors G4, X50,30-90, Imperio

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RAPTOR 30
MDS .38 Engine
siralbert

Heliman

Chehalis, Washington USA

Just today I stripped out the glo-plug threads on my OS32. I bought a
MDS .38 Helicopter Engine NIB at a swap meet last summer thinking it may work as a back-up eng for my basically stock Raptor 30 never thinking that I woud need to replace it for a dumb reason like stripped glo threads. . While I'm in there stirring things up does anyone have a list, in desired order, of possible beneficial upgrades? I'm not into 3D or anything like that and at 66 I'm not likely to either. Also does anyone know of any possible problems installing the new engine. For that matter does anyone have any oppions about the MDS .38 Heli engine. I couldn't easily pull the fan from the OS32 so I ordered a new head and gaskets, new fan and clutch so as to have a replacement engine on hand. I'll go ahead with the MDS.38 and keep the OS.32 in standby.

02-13-2009 Over year old.
MartyH

Elite Veteran

USA

I've run that engine in a 30 size heli before (not mine) and hated it. Particularly the carb which was junk. Personally if you are interested in "upgrades", I'd take this opportunity to not fixe the 32 and grab a good used OS37 and send the MDS down the road. THAT and carbon blades will do more for the Raptor 30 than anything else. DO NOT get caught up in the desire for metal parts for performance reasons. Short of going all the way to a kasama or g-force head, the metal parts are just duplicates of the stock configuration.

02-13-2009 Over year old.
payne1967

Elite Veteran

warwickshire uk

i've had a couple of mds38's and have had good luck with them, lots of power and reliable
others have had carb problems but until you run it you will never know
as far as metal upgrades on the raptor the quick uk tail belt guides are about the only thing that my be worth using

02-13-2009 Over year old.
HOMEPAGE  
BEAR

Senior Heliman

Peterborough

Metal
Door
Stop!!!

02-13-2009 Over year old.
artimus

Key Veteran

Buckley WA

I own 3 raptors and the first thing I would do is scrap both motors and get a 50 in it . Raptors are heavy and will be way under powered with any thing under a fifty. There is just not enough power to get you out of trouble if you need it. I crashed too many times because of under power. I am 55 and don't do too much 3D so I have gone to Scale Birds and the extra power is nice when needed. A Raptor conversion kit will have all you need to convert to larger blades and boom. A 50 just flys better for the weight to power ratio. I used a TT 50 then moved up to a Hyper and now a Redline 53. The head speed will be where it need to be for stability and you will enjoy the power.

You can do a short boom conversion that you keep yous 550 blades and boom and just change the gear ratio with a 50 in it..... try it you'll like.

AMA #890376 I thought I was wrong once.... but I was mistaken......

02-13-2009 Over year old.
Tyler

Elite Veteran

Chicagoland area

Raptor

1. I used the MDS .38 for about two years. It ran much better on 30% fuel than 15%. I thought it was a decent engine. A couple other local guys has problems with theirs, though. I always tried to run mine slightly rich, but I can't say the same for the other guys. You already have the engine and it isn't worth a dime to sell it, so I'd say you have nothing to lose by giving it a shot. You might find that for your needs and flying style it will work perfectly fine, at least for a while. Mine eventually got sloppy on the connecting rod, but so have many other engines I've owned. If you had to go out and buy the engine, I'd say absolutely not.

2. The OS 32 could possibly be fixed very easily by posting a wanted ad for a shot engine with a usable head. I bet only a few bucks would land you a new head.

3. Some people don't need any more power than a 30. If you only hover and fly gentle figure eights then a 30 is perfectly fine, even the MDS .38. Heck, I learned to hover inverted with a Raptor 30.

4. If you wanted to invest in new parts, I agree that buying a new OS .37 would be the best choice. Get a quality muffler to go along with it.

5. There are many benefits to upgrading to a 50, like auto rotations, lighter disc loading, and more stable hovering. However, I'd suggest saving the big block conversion for the next new kit you buy. Fly the 30 for what it is. Fuel economy is fantastic and fuel prices are out of site. I would not be surprised to see the 30 class become more popular again for the sport pilots out there. Those that only hover and put around don't need to feed a 50 at $38/gallon.

6. Don't fall into the upgrade game with a Raptor 30. You will NEVER get single penny back when/if you sell it. I agree with the previous advice of investing in carbon blades. Even cheap fiberglass blades will make more of an improvement on a 30 machine than any other upgrade.

Enjoy things that money can buy IF you don't lose the things money can't buy.

02-13-2009 Over year old.
HOMEPAGE  
siralbert

Heliman

Chehalis, Washington USA

My Decision right or wrong??????

Thanks for all the input guys. Here's what I think I'll do. Correct if I headed of in the wrong direction please!!!!
I think I'll go with the the OS37, repair the OS32 for backup or??
Out of obstenity I'll setup the MDS.38 and at least give it a chance, however my end goal will be to run the OS37 with carbon blades and do few minor replacement parts such as flybar control arms and washout set as there is more play in them then I think there should be. Also I've read here in RR thay the stock muffler is inadequate for use on the OS37. If so - - what would be the appropriate way to go. I usually burn Cool Power 15% for all my planes and the helpelicopter. Thanks again for all the Help!!!!

Also Tyler this possible sugestion of a short boom conversion using a 50 engine, 550 bades, stock frames and tail boom has got my attention. You also mentioned gear ratio. Could you please expand on that subject?? Thanks again!!!!!!!!!

02-13-2009 Over year old.
MartyH

Elite Veteran

USA

I like your plan except for me I'd skip the MDS engine and I would not fix the .32. For a muffler for the OS37, the Mavrikk for the 32/39 is an awesome exhaust. I have two of these and one of the new Century CN3039 and Century is incredibly loud and has a tone that drives me crazy. If you are just starting out, maybe hovering and flying around a bit, the white Mavrikk sport carbon blades are very hard to beat. I still fly them on a coupleof my helis when I'm just knocking around.

Here's the blades....$49.99

http://www.heliproz.com/prodinfo.asp?number=802100

This is the muffler you want for the OS37 and it's only $28!....

http://www.helihobby.com/html/muffl...ml#PARTMVPV0102

02-13-2009 Over year old.
helibro

Veteran

hamilton, ohio

ya ha ha i would deffenatly not go with a mds, as i think marty is talking about mine, it was brand new, he did get it running but i deffenatly wouldnt rely on it at all. i was unable to get it to run for me so i would say it has a goofy carb and needs a person that has done alot of tuning to get it to run.

02-15-2009 Over year old.
dell17999

Senior Heliman

Shanghai,China

MDS38 I used 10 yuars ago on my r30 v1 , junk, get a OS

03-26-2009 Over year old.
LDR

Senior Heliman

Sarcoxie, MO

You can also do this to a TT .39. Its has a OS .50 carb in it and will idle forever, and dont run to shabby either.

Thats gonna require parts!!!

03-27-2009 Over year old.
MartyH

Elite Veteran

USA

...and the carb is generally the problem with these engines anyhow. Otherwise they're just an air pump. Assuming they didnt really screw up the port timing, replacing the carb will generally net a decent engine. I am using a 3 needle OS carb from the pumped 91 on a Thunder Tiger 70 and it runs just like an OS from a tuning standpoint. Sadly, it just doesnt make the power of an OS70.

03-27-2009 Over year old.
nivlek

rrProfessor

Norfolk England

MDS engines are total junk . Yes you could fit an OS carb , but all you'd have is a piece of junk with an OS carb .

There are loads of suggestions as to what 'MDS' stands for , including 'Mine Doesn't Start' , 'More Dead Sticks' and 'Metal Door Stop' .

At the end of the day , it gets dark .

03-27-2009 Over year old.
MartyH

Elite Veteran

USA

Fortunately they're almost all gone now so we shouldn't have to worry about too many people popping up with them anymore. They were indeed junk. I had a couple of the airplane MDS 46's or 48's or whatever they were come apart in flight on airplanes. The crank would break and that'd be the end of that. THAT experience in turn has kept me away from the Evolution engines because like the MDS, Horizon really plays them up. I like Horizon as a whole but really dont like the way they pimp crummy 2-stroke glow engines. It's a downright shame they try to sell us that heli engine!

03-27-2009 Over year old.
nivlek

rrProfessor

Norfolk England

The Evolution glow engines are made by the same factory as SC , ASP and Magnum . Again the biggest issue would be the carb . As it happens , years ago , I did run an SC 36H with an OS carb for a couple of seasons in a Space Baron . It did run well .

At the end of the day , it gets dark .

03-27-2009 Over year old.
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Thunder Tiger Raptors G4, X50,30-90, Imperio

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RAPTOR 30
MDS .38 Engine
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