marquisvns

I am looking for a power plant for my 86" P-40, was thinking about a DA-85, but I think a twin should sound better plus, it'll fill up inside the cowl nicely, any suggestions??

Thanks in advance,
barry

mtenginesusa

you may like ZDZ 80R2 engine or even ZDZ100R2 FROM TBM . this is the link :

http://www.troybuiltmodels.com/items...R2-INLINE.html

TxDiveBomber

3W makes a 110 inline.


http://www.aircraftinternational.com.../3W110iR2.aspx

mtenginesusa

3W110 may too big and too heavy for 86" P-40 I think .

Zeeb

My Feedback: (41)

Be aware that while it's a nifty install, it's fraught with difficulities. Inline twins are hard to cool the rear cylinders and when you get 'em in a Warbird which is notoriously difficult to cool anyway, well I think you get the idea?????

I followed a thread several years ago where a guy over in England put the ZDZ-80 in a P-40 and he eventually got it to work but not without first cooking a rear cylinder and having to come up with some pretty sophisticated baffling inside the cowl.

A big single would be much easier to deal with and actually have more power.

Just a thought.....

marquisvns

Thank you all for your inputs, I agree that a single like a DA 85 would probably be a good choice, but would like to minimize vibration and was planning the twin for the sound, any other suggestions? is there gas four stroke?

NM2K

My Feedback: (14)

Well, it is true that the twin will cause less vibration, once the rear cylinder is destroyed via overheating. The engine won't vibrate if it doesn't run.

Think about it, how are you going to determine the proper mixture for either cylinder without using an exhaust gas temperature gauge (EGT)?

Now, a liquid cooled two or more cylinder inline engine would make terrific sense to me.

Of course, there is the air cooled four cylinder inline four-stroke engine by OS Engines. They are reputed to run without serious problems, but I don't know if it is of sufficient size and power to pull your giant P-40 in appropriate style.

Whatever the choice you make, I truly wish you much success and I hope that you will report back here at RCU with all of the juicy details. Prove me wrong!


Ed Cregger


PS. This post is meant tongue-in-cheek and with appreciation and fellowship towards the OP.

rc bugman

My Feedback: (30)

MVVS makes a 58 cc liquid cooled engine, single cylinder. With a radiator and pump, the cooling problem is solved and then you have the fun of sizing the radiator and determining volume.

Elson

rmh

in lines are fine - and air cooled is fine

the cooling requirements are not tricky but require common sense.
the fuel requirements for the rear cylinder typically are higher simply for cooling
compression for rear cylinder can also be changed -lowered -
the use of a pressure cowl is almost madatory-
this means a cowl interior which forces all airflow through the cylinder fins
you can NOT blow air thru the cowl - you have to rely on lower pressure behind the cylinders to extract the heated air and allow freh air from up front to flow in
I once fixed a inlin twin engine for a friend -who had actually melted the rear pist
looked like a piston out of a fuel dragster. one side simply melted.
if all of this is a little much-
go electric-

tomyrcmodels

V shap inline maybe the way to go if four cylinder . front make V line and the rear are flat box. what you think ? he he

rmh

Power to weight of these setups -based on others I know about sucks-

ec121

My Feedback: (2)

I have a buddy who put an inline 3W 80 on a fiberclassics mustang. He ran a duct from the oil cooler scoop to the back of the rear cylinder and used the ram air effect to cool it. Also it could have directed the air flow thru the cowl to the duct and acted like a baffle to run the air past the rear cylinder. Either way he flew it twice with no problems then in an effort to build one lighter he cannibalized it to build another one . Also ran the exhaust thru the fuse, over the wing, and out of the oil cooler exhaust opening to keep from having muffler pipes coming out of the cowl. Complete scale cockpit with air cylinder operating the canopy. Weighed 43lbs. and excellent power out of the 80. Flew it once before paint and once after painting it. Likes to build and design more than fly.

Macka51

G'day to all,

Attached are some pics of my installation of a 3W 150cc inline twin in a 1/4 scale P51. The baffling directs the air down the carbie side (high pressure) then through both cylinders onto the other side (low pressure) where it exits around the back of the engine mounting plate at the bottom of the fuse/cowling. Although the Mustang hasn't flown yet, initial indication from ground testing using an Eagle Tree system measuring CHT's from under the spark plug shows good results. At idle both front and rear sit steady at 138-140 deg F. At full power the front sits at 190-195 deg F and the rear at 200-210 deg F. Its quite surprising just how much hot air exits out the bottom of the outlet.

The issue I may have in the air is the higher pressure air influencing the tuning of the carbies.

Cheers, Macka.

Thunderbolt47

My Feedback: (8)

From what I've noticed, most people don't know how to baffle a single, much less a inline twin.


Nicely done Macka. neat and efficient.
Kelly

gzkpez

If you like DA's why not get the DA100 inline? It is new and was introduced at the WRAM show. It should be available by summer if I remember right.

Kimhoff

My Feedback: (22)

The other option that know one has mentioned is the fuel choice. Run it on Methanol and you can pick up cooling efficiencies and performance.

Now everyone will tell you that is takes twice as much and the cost will be higher ect. This is true but if you can afford to build this then you can afford the fuel and I don't know many who fly long enough to burn a complete tank of fuel even if it contains Methanol.

Mike/TBM

In general most engine suppliers have done a poor job explaining or showing how to baffle an engine properly. It is especially true with a minimal frontal intake area, tightly cowled, water cooled warbird in which we are trying to stuff a ram air cooled engine into with minimal changes, if any, that would affect the scale appearance in any way. Now throw in a multi-cylinder inline and the baffling needed gets very complex as we can see.
A general solution to help with the problems of baffling the engine correctly and efficiently for proper cooling is a tough one. Ultimately the craftsmanship of the modeler in conjunction with a good knowledge of what has to happen based on their particular applicationwill go a very long way.
The ZDZ inline engines in particular have the top fins molded at 90 degrees. The centerline baffling is to also include a splitter plate between the cylinders. Pressurized incoming air from one side is forced across the engine. When properly done, this should provide even cooling across both cylinders so mixture offset, reduced compression or any of the other radical modifications would not need to be done to cool the engine. Proper air extraction as mentioned previously is very important and must be done properly to create the vacuum needed to make the whole system work efficiently. We must not neglect the crankcase, exhaust system and carburetors from getting the cool air they need as well.
With the increased demand for bigger and badder warbirds and now with the release of the ZDZ 150 triple inline, we are diving into the issue of proper cooling more so than ever.

thunderbolt-RCU

My Feedback: (14)

anybody know where to get a inline 150 class engine. Both 3W and ZDZ no longer make them
Brian

earlwb

Kolm has a two and three cylinder inline engine. But the three cylinder one hasn't been released to production, but it sure sounds like a V12 in the air though.
Unfortunately they are four stroke engines though.
http://www.kolmengines.com/HOME.88.0.html





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thunderbolt-RCU

My Feedback: (14)

who sells the kolm in the US.

Thunderbolt47

My Feedback: (8)

I have a friend that was selling his 3W 150 inline. He may still have it. I can check if you like.
Kelly

thunderbolt-RCU

My Feedback: (14)

Yes, I would be interested.

He can contact me at [email protected]

MTK

Nobody mentioned the MOKI 360 in-line twin gassie. Seems to me this one would have more than enough beans for an 86" model

Thunderbolt47

My Feedback: (8)

Hey Brian, I called him and he still has it for sale. I will foward your E-mail addy to him today.

BTW You meet my friend at Moster Planes last year. It is Rick with the yellow half scale Bucker Jungmiester. Small world

Thunderbolt47

My Feedback: (8)

I believe Der Gutz is selling them at Vogalsang Aeroscale.