Hi guys,
I'm picking up a H9 p-51 "Marie" http://www.hangar-9.com/Products/Def...ProdId=HAN2375and want to stay with an OS 2 stroke. The specs say.61 - 1.00 (2-stroke), .72 - 1.00 (4-stroke)
But when I look at the new Blue nose P-51 the specs say
.60–1.20 (2-stroke), .91–1.25 (4-stroke), 20cc gas
The two planes don't seem that different so I was thinking of using an OS 75AX or OS 1.20AX 2 stroke. Will the 75 be enough or will the 1.20 be to much and to heavy? I like to fly at full throttle at times but also enjoy 1/4 to 1/2 throttle flying as well.
I would ratherNOT cut the cowl for the engine and pitts style exhaust is that possible?

How long has the Marie version been around?

Thanks

I hate 2 strokes. Why not run a 4 stroke?

It has been around for a long time. One of the guys in our club has been flying one for a few years.

It has weight listed as 7 to 8.5 pounds.

The Blue Nose has weight listed as 9.5 to 11 pounds

You could go with the 95AX http://www3.omnimodels.com/cgi-bin/w...I=OSMG0580&P=0

I do not know about muffler fit in the cowl. Mustangs are fairly skinny. Look at page 42 of the manual http://www.hangar-9.com/ProdInfo/Fil...375-manual.pdf and see how the cowl hugs the Saito four stroke they used.

Carrell

I'd like to have a 4 s but they're a bit out of my price range, now that I have less money thanks to Unckle Sam. lol

Thanks Carrell i'll check out the manual thanks for the link. Do you think the 95AX would be the best performance and fit option?

first I am surprised you found a Marie there on the chopping block for discontinued planes.

if you want to read about the blue nosed P-51 here is 39 pages http://www.rcuniverse.com/forum/m_8623566/tm.htm

for the marie go to the warbirds section, there are several long posts about it.

the 2 planes are night and day apart, the marie is a 8.5lb plane with open bay wings,the retracts are light weight and although servicable, many like myself have chosen to replace them with upgrades and struts.

the blue nose is more like 11lbs, and has fully sheeted wings and a heavier set of upgraded retracts, foiled control surfaces similar to the Top Flight ARF/kit, I will let you do some reading for yourself.

I should preface this by saying the Marie is one of my favorite planes, it flys like a sport plane and floats in for landings, its a good starter warbird with retracts and is just a cool looking plane in general.

now for engines, mine is powered by a OS 91 surpass 4stroke, and has plenty of power to do just about any manuver I need it to do,there is no need to over power this plane it is very light, anything over a 120/125 4stroke and its waisted power, and really dangerous, since without some major strengthening it will rip its self apart,there are many posts about weak firewalls and the flat tail feathers failing when overpowering this plane.

I would recomend using a 4stroke since they hide well in the cowl, run inverted with little to no adjustment sound better in a warbird IMO,and in the case of OS have very little oil residue even after a full days flying.

if your going to run a 2 stroke they are a little more fussy when inverted and require the tank to be positioned just right for reliable running.

mounting it sideways isn't the worst thing for numerous reasons, using a pits style muffler, but your going to have a head sticking out of the cowl but not a big muffler hanging out the side something I can't stand on my planes.

the 75AX would be a good choice for a 2st, or a 91 maximum for the Marie, the 120AX is really over the top unless your working the model over for speed, because thats what your going to get, as well as needing to cut the cowl up quite a bit for cooling and clearance.

these are just my opinions of course here's mine

another thing I would suggest leaving the strut covers off they are problematic with the wire gear that come stock with the plane,mine now has a pilot and the new gear,with Robart struts and wheels,I had to make my own wheel wells and gear bays dumped the plastic ones

The 95 and 120AX, on paper, appear to be close in size. Advertised weight difference, without muffler, is about 3 ounces. If you can see both of them at a hobby shop it would definitely help. I have a feeling the 120 is a lot bigger when they are side by side.

I've never seen any AX other than the 46 outside the hobby shop, and it has been a while. It is at the top of the recommended range for the model and I think that's where you want to be with a plane like a P-51. Even if you do a lot of part throttle flying, you want to be able to kick it in the tail and do a really high speed strafing run once in a while.

The 95 and 120AX both cost 280 with muffler. You can get the 120 without muffler for 240. If you have to buy an aftermarket muffler for either, the cost goes up. The Saito 100 costs 330 and you should be able to use the stock muffler. If there's any way you can swing the four stroke, it might be worth it for the easier muffler fit.

Carrell

Thanks bigtim,
My LHS had it sitting on the shelf for a while now said they don't make them any more so I had to get it. lol
I really do not want to chop the cowl up so it sounds like I need to go with a 4 s. An OS 91 surpass 4stroke would be great! Just have to save some more pennies.
I have been reading about the Robart struts, wheel mods and flap mods and they're on my to do list.

Thanks for the pics. Do you know how long the Marie has been around?

I still fly my old one with the OS FS120 pumper and a 15X7 3 blade. It's the perfect combination for for this one.

Ok you guys talked me into it. 4 s it will be! lol
Thanks Carrell Can't get the sato I'm buying through Tower so i'll stay with OS.
So the perfect candidate would be a OS 91 surpass 4stroke but which one? Tower has one with a pump and one with out. What is the pump for and do I need it?

Beautiful plane cowboy! Thanks!

bigtim is that the stock exhaust showing in the first pic?

you probably don't need the pump,its nice to have but not totally necessary,it keeps the fuel coming at a constant rate, so in high G turns or when doing 3D type flying you get good fuel pressure.
also you can mount the tank on the CofG and and the pump will draw the fuel from there instead of needing the tank behind the firewall, I have several pumped engines there fine,but the pump doesn't add any real power just fuel flow, my Marie has a standard non pumped OS surpass,I also have a H-9 Warhawk with the same OS 91 it flys great.

its a early surpass silencer on a newer engine, the pipe is new just the silencer is the older style.

I had a older engine and I wanted the shorter pipe, when I sold the older one I shipped off the longer new one to the buyer, here is the regular pipe http://www3.towerhobbies.com/cgi-bin...?&I=LXCP62&P=Z its just a little longer than the older version.

here is another option pitts style for a 4stroke little pricey but has a clean look to it http://www3.towerhobbies.com/cgi-bin...?&I=LXVNM2&P=Z

I see, so by using the pump you can also eliminate the use of the vac/pressure hose to the exhaust correct? How big is your fuel tank and how long can you fly on it? Do 4 strokes usethe samefuelas 2 strokes? I'm using 16% wildcat now.

Sorry for all the questions bigtim but I noticed you're flying near the coast. How does the Marie handle in the wind? What size prop are you runnin and what do you recommend?

Thanks

had to take a break to give the kids dinner,I will try to give you my best answers, I used the stock tank that came with the model it works well enough and has not leaked in several years use,I get about 15 min of running time with fuel to spare for a go around but not alot past that.

the pumped 4st engines dont need the pressure line thats correct, its more like the oposite they need a vent so the pump can suck the fuel out of the tank without making a vacuum in the tank, on a couple of my planes I have epoxied a brass tube to the bottom of the cowl to secure the vacuum line so its not flopping around.

yes most fuel with a oil content at aprox18% oil and 5-15% nitro works well for OS 4strokes I use it in my 2 strokes as well,I don't know much about the wildcat fuel I run either powermaster 10%or Omega 10% with 17%oil both work well in all my engines.

you know I try not to fly it when its too windy,10-15mph is about my limit,before it becomes work not fun, but it flys well, very stable in the air, not really self correcting like a trainer but very stable, its a point and shoot plane.

as for props I like to start with a 14/6 Masterairscrew prop for the first few gallons of fuel, good thrust,and fair top end speed.

after the engine is broken in I have now switched to a 14/8 MAS for a little more zip and power, when I first started flying the Stang I was tipping over a bit, and the MAS props will handle a few prop strikes before breaking, so I have just stayed with them, I like the wide blade and white tips, there not a super performance prop but they work well enough and there durrable

Iagree just seems like to much work with winds above 15 mph.15 min of running time sounds great, I get about 11 min on my OS 46AX.
I get to pick it up tomorrow I can't wait! lol How long have you had yours? Thanks for the prop info and if you wanted great thrust and great top end which prop would you choose? I like a little speed sometimes. lol

you could go with a little higher pitch prop like a APC they are a little cleaner in foil like a 14/10 http://www3.towerhobbies.com/cgi-bin...?&I=LX1596&P=0

one thing about 4 strokes break them in easy, and as they get broken in they get stronger, and can swing higher pitch props, there not like a high reving 2st your only going to get about 9,700 RPM but plenty of low end.

its like when I do a fly by and the engine is purring, I pull up and I wonder when its going to bog and tip and it just keeps going untill I pull back on the throttle way cool and not all screechy.

I have had mine over 3 years now at least I maidened it about this time in 2007

just an idea for u on engines i know u said that u want to run a 2 stroke becasue of money issues but if its not to expensive for u hobbyking.com out of china has asp 4 strokers for great prices in case u werent aware asp and magnum are the same motors they go by magnum in the usa and canada. i just ordered and recieved my asp 120 4 stroke a couple days ago and the thing runs great. i did a lot of reading on them in these forums here and had a lot of people saying good things about them as well as some saying not so good things. ordering things out of china can be a bit of a gamble since u dont really have much of a warranty but for that price i couldnt afford not to buy one and im glad i did. all my other motors have been o.s and super tigers, but if i can keep getting lucky with these magnums then i think all my next motors will be them. they also have a 91 4 stroke for 129 bucks and a 61 for 99.99. just something u might want to consider. the web address is www.hobbyking.com oh and if u sign up an account with them u get better pricing on items!..anyway my .02 cents

heres a better link to the engine section on hobbyking if your curious http://www.hobbyking.com/hobbyking/s...p;ParentCat=55 p.s the asp/magnum 4 strokes sound awesome!

Bigtim thanks for all your help.
I'd like to go with the MAS props it's what I use already plus I like the black and white stripe like you. lol I'll definitely use the 14 x 6 for break in and i'll pick up a 14 x 8 as well. for even more zip what would you suggest in MAS? I'm still learning about props and am a bit confused..lol Is there a prop table somewhere that shows the different RPM and torque statsfor different size props and 2 vs 4 stroke?

jeffsos thanks for the info. I don't really know much about the Magnums, I did check them out a bit but just feel more comfortable staying with a brand I know. Yes i'm being anal. lol

These forums are great! Thanks to all of you for your help! It's nice knowingthat anyonecan ask anything on here and get great advise. I spend many hours on here daily reading what I can. This place is awesome!

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