JoeEagle

My Feedback: (26)

I have an opportunity to purchase a 1/4 scale mustang with an in line twin. problem is, i forgot to ask him which one!!

I am guessing either a 3W 100cc or a ZDZ 80 or 100cc. i know that ZDZ is re-issueing there motor, so i know that it is not a "new" motor.

the plane has been flow twice.

so, here is my question for your experts. what should i look for in the motor? any problems with either brand of twin? if so, what type of problems and are they easily fixed.

at the risk of being flamed, im posting this on the twin forum as well.

i appreciate your help.

cheers

joeeagle

dirtybird

My Feedback: (5)

I have a Super Tiger 60 cc that has been converted to gas.
The rear cylinder tends to run very hot. The problem is not easily fixed.It needs a blower back there.

rmh

This problem with the Tigre is built in -
Basically you must change fuel flow balance
some guys put a restricter to front engine -in the crank - The rear cyl needs MORE fuel -even if the flow internally was correct
Why?
because the rear cylinder has to get rid of internal heat as well as heat from forward cyl.
The ZDZ with individual carbs has a much better chance of running with balanced heat.
The ST on gasoline is a worst case scenario.

RCSHOWCASE

The NEW ZDZ 80 and 100 cc R2 inline Twin gas engines from ZDZ are completely new designs and not a re-ssue, or re-hash, of a previous ZDZ inline design. I doubt if the Mustang has the New 100 R2 in line in it as we have not shipped any yet in North America.


David Garrison
RC Showcase
ZDZ, ROTO and RCS Gas Engines
www.rcshowcase.com

RCPilot100

My Feedback: (4)

Joe,

3W used to have 80 & 120cc inline twins - if the plane has a 3W twin, I would expect it to the 80cc size. My buddy had one of each - both ran extremely nice.

Dan

JoeEagle

My Feedback: (26)

thanks to all for their reply's. i know it is not a new ZDZ inline twin, just wondering out loud what issues there are with either brand of in line twin.

since the RCShowcase guys answered ( i called wed but i imagine you had left for turkey day!) what issues or problems existed with the old style ZDZ 100 and 80?? carburator problems? overheating of the back cylinder???

nice to hear that the 3W ran just fine.

cheers to all

joe

RCSHOWCASE

Joe:

We sold , i think, only one or two of the old inlines before they were dropped from the line up, so we have limited experaince. There was also a 120 inline with THREE 40 cc cylinders! They were of a steel liner design and rather heavy and ZDZ was moving to engines with all Nikisal plating on the aluminum cylinder wall. We have never had one returned for service......


David G.

RC Showcase

Big_Bird

My Feedback: (1)

Joe, here is a really dumb question. Why don't you get back with the guy who has the plane for sale and ask him about the engine?

Here are photos of a 3W inline twin in a 3W Mustang. The plane really flew well. The guy indicated that he worked hard to fix the cooling problems before he was satisfied with it. There is a cooling air tunnel which exits out the back like the full scale did. These photos were made at Bomber Field last September.

Ken

JoeEagle

My Feedback: (26)

1st, thanks for the pics...and no, its not a really dumb question, but i cannot get ahold of the guy until later in the week and then i will be committed to traveling to see him. i'll call him monday but im out of town until thursday or friday.

i was just wondering out loud what the general experience was on these in line twins. i had an opportunity to purchase a 3W P-51 last year and didnt jump on it....stupid stupid stupid...oh well, this is a good deal (i think) and if so, i'll be happy with the plane and the motor.

cheers

joe

dirtybird

My Feedback: (5)

My Tigre was converted and set up with the internal balance device by C&H. The rear cylinder still runs hot.

rmh

Another E Mail just asked the same question!
See my first post on this .
You must drop rear compression till heat levels out -
sure the power is less but unles you could water jacket the darn things you simply can't get proper airflow - look at the various installations - the rear cyl is also up against a wall on some .

Diablo-RCU

My Feedback: (1)

You could always machine off the fins on the front cylinder. That way, both cylinders would fry the same....

rmh

Has that been tested ?
(Here Stanley-you take this hammer and when I nod my head -you hit it."

RickVB

My Feedback: (24)

Ken, I'm curious, do you know which 3W Mustang that was that you posted the pictures of? Was it 112" or the 100"? (I assume it wasn't the 72" ). Thanks.

Big_Bird

My Feedback: (1)

Rick I really don't know but it was not 72". I would guess, from the general size of the plane, that it was 112".

Ken

RickVB

My Feedback: (24)

Just trying to decide if that engine would fit in a Steed Mustang (94" wingspan, I believe).

L454S

My Feedback: (3)

Joe, Lenny in New Orleans here. I have done 3 of these setups and it takes a lot of engineering and ducting to make it work in a P51 or Spit cowling. I make a dedicated duct for the rear cylinder blowing directly on it and make the the opening for the front cyl, fairly small. You might try and avoid having a flat firewall right behind the rear cylinder and have lots of exit air, even if you loose some of the scale appearance.

p51flier

Just read in a german rc forum that ZDZ allready have a prototype of a 150ccm 3 cylinder inline. It seems that all the new ZDZs are based on the 50ccm cylinder. Maybe a new 4 cylinder boxer is not far away.

Joe

JoeEagle

My Feedback: (26)

hi lenny:

thanks for your pics of what you did. i like it... im being lazy and trying not to have to make huge modifications to the existing plane, since it already is done and i just want to fly it. but, i like the scoop for the rear cylinder... very cool.
is this for an american eagle plane?

also, what do you think about the ducting from the radiator being used to route the air up from the radiator to the rear cylinder via a hose. the firewall already has a hole cut in it behind the rear cylinder, as per the plans from fiberclassics.

hey, my in line twin has a carb on each side, yours looks like it is on the same side. is that the 80 or the 100 or new?

cheers

joe

ps, i am still working on the drive and would like to see if you are still interested in our arrangement previously discussed. i'll email you off line.

L454S

My Feedback: (3)

Joe, the hose idea is fine if there is enough outlet air for both cylinders on the cowling. Those are 2 different AE P51s and the third is in an AE 109. These are ZDZ80s, not the new ones that just came out.

JoeEagle

My Feedback: (26)

Hi Lenny:

here is a pic of my ZDZ 80....wonder why the induction system is different than yours??


cheers

joe

Tobbe

For cooling tips on inlinetwins go to[link]http://www.3w-modellmotoren.com[/link],
Regards Tobbe