onewing

My Feedback: (27)

Hi Guys,

I received my Composite-ARF Corsair (plug-in wing) and retracts in January. I know many people use RCS radial engines on this bird for good reasons. I personally would like to save some money and use a 3W 110 cc twin or something similar. The diameter of the cowl is about 12.5 inches. DA150 or 3W157 will not fit.

My questions are:

(1) Wouold 3W 110 cc twin powerful enough to fly this 40-45 lb beast? I know it will get the bird in the air, but I don't want my Corsair flies like a school bus.
(2) What are the other options?

Thanks.

Onewing

Jetjockgb

My Feedback: (4)

Hi Onewing,

Yep, I had the same trouble with My XXL,Perfect engine would be the Moki Radial but ££££$$$$.
So I was doing the same ,looking for a boxer that fits and yes you are right, the DA 150 and the 3W 175 are all to big because of the plugs,but what does fit is the 3W 200 Twin spark, as the plugs are offset//angled.

Cheers Graham B
WWW.tigermodels.net

didiwatt

My Feedback: (38)

Onewing:

The biggest problem is that the plane is designed for a 12lb engine so you have to compensate or put 3-4lbs in the nose.

After having built one of these (wing tube version), I feel that you could move the tail servos forward and not install the brackets but I am not sure that would be sufficient. The retractable tail wheel assembly is the biggest culpret. That in itself is several pounds. A guy could install a light weight fixed tail wheel thus not needing all the extra weight of doors etc but!!!!!!!!!!!!!!!!!

I checked that balance on mine just before I disassembled for painting. I propped up the plane on the main spar with no wing panels on it. The instructions call for 1/2" in front of this spar. Mine took 3 ozs on the tail to balance on this location which I felt was close enough at that point. All my radio gear, radio batteries, air tanks, retract valve, etc are in the wing center section so these could be moved forward in the fuselage if need be.

Don't have a total weight yet but will pretty soon.

Ken H also has a thread going on the wing tube version on flying giants under "scaled out".

Good luck on yours. Hope to fly mine the end of this month but the weather has been awful.

Paul

onewing

My Feedback: (27)

Thanks Graham and Paul,

Is 3W 200 twin spark a 2-cylinder or 4-cylinder?

Onewing

Jetjockgb

My Feedback: (4)

Hi Onewing,

Yep, It's a 2 cylinder,have a look at Barrys build, http://www.rcuniverse.com/forum/m_70...35/key_/tm.htm

Cheers Graham B.

BigRetracts-RCU

" The retractable tail wheel assembly is the biggest culpret. That in itself is several pounds. "


The Actual Weight of the Retractable Tail Wheel Retract is only 10 oz. Yes this means about 2-3 pounds
extra in the nose, but would mean a lot more if it really did weigh 2 pounds.

Moving the servos out of the tail would save a lot of weight in the nose.
The Prototype flew at 46 lb. even with the 11 lb. radial.
Just use a 110cc engine or larger and a few pounds of extra nose weight and it will fly.

Just setting the record straight.

Darrell

onewing

My Feedback: (27)

Hi Graham,

Twin spark is a great idea. I just checked the dimension on 3W 170 twin spark. Looks like the distance between spark plug caps is approximately 11.7 inches, should fit within the cowl.

Thanks.

Onewing

didiwatt

My Feedback: (38)

Of course you are correct Darrel. I was thinking of all the plywood formers and the entire assembly which would include the door mechanism's etc. I was probably a little overboard on the weight.

Personally I love my tail gear and would put up with the weight in the nose.

Paul

BigRetracts-RCU

Paul,

Just didn't want potential buyers to not get the tail retract because they
might be afraid of the weight of it. It really is light for it's size.

Darrell

Jetjockgb

My Feedback: (4)

Hi Onewing,
No Probs, glad I could help.

If your after a 200 I might sell my one at a good price!!!!!

Cheers Graham B.
WWW.tigermodels.net

Jetjockgb

My Feedback: (4)

Hi Darrell,
hope your well.

Yes your Tail Wheel is a big must if you want to get the right look, there is not that much weight gain on the tail of my xxl[sm=thumbs_up.gif][sm=thumbs_up.gif]

Cheers Graham B
WWW.tigermodels.net

NCIS

Darrell's tail wheel retract is great and I love both of mine. I have one for my 1/4 scale Don Smith Corsair and my TF GS Corsair.
With my 3W 200 Graham pictured above I have about 1/8" clearence on each side with the leads on. It is snug but it will also fly the bird very scale and with authority. I'll be turning my 32"x12 Solo Prop with it.

Barry/Gibbs

onewing

My Feedback: (27)

Hi Guys,

Can someone with giant (40 lb and above) warbird flying experience tell me how 3W 110 cc engine would fly this 110", 40-45 lb Corsair?

Thanks.

Onewing

didiwatt

My Feedback: (38)

Onewing:

Cannot remember where I read it, maybe on Comp Arf's website, but the plug in wing version is suppose to be about 12lbs lighter than the folding wing version. Will let you know in a couple days. According to Darrell the prototype is 46lbs.

A DA-100 would handle a 34lb (46 minus 12) plane with authority. Will take my 29lb plane verticle.

Paul

NCIS

Onewing,

What does Comp ARF recommend for the plug in wing version? Thats where I would start and go bigger. 110cc sounds like it would probably fly it but you don't want to be full throttle all day just to fly.

JMHO,

Gibbs

Rebel Flyer

What about the BME 115? Cal Branton had a 102" Conashin Corsair that weighed exactly 50 pounds, and he flew it with a BME102 or a 105(I forget). It flew it with authority, even at Denver. I am thinking it might be a little light, but you can build for that, and would fit in the cowl too.

Just my 2 cents worth

Rebel

BigRetracts-RCU

The Plug-In Wing version will only be 4-5 pounds lighter. The wing fold mechanics
and Hydraulics only weigh about 3 lbs. So I can't see the extra hardware weighing
more than a couple pounds more.

Darrell

didiwatt

My Feedback: (38)

Once again, Darrell is right and Paul is wrong. Strike two for me. Darn you Darrell !!!!!!!!

Just unofficially weighted mine by sections. 45lbs on crummy older UPS scale.......

Damn!!!! And mine is the wing tube version. Was hoping for much less............ Oh well............ Looks good.....

Paul

onewing

My Feedback: (27)

Well, I called Gerhard of Aircraft International. He measured the cap-to-cap distance on the twin spark version of 3W157 (same dimension as 3W170). It is about 12.125 inches. Very tight fit.

I also called BME. Tom also measured the cap-to-cap distance of BME's 150 cc engine. It is about 11.5 inches.

BME 150 will fit in the cowl more comfortably. It also cost a lot less. I have been using 3W engines on all my giant scale warbirdds. My question now is: Is there any reason that I should stay away from BME?

Thanks for your inputs in advance.

Onewing

onewing

My Feedback: (27)

OK, I decide to use the 3W 110 cc "competition series". It has a cap-to-cap distance of 11.5 inches. So, it will fit comfortably within the cowl. In terms of power, as John Reno flies his 45 lb, 110" Spitfire with a 3W 85cc competition series engine very impressively, I think 3W 110 cc should fly this Corsair just fine. To me, reliability is number one consideration in terms of warbird engine selection.

Onewing

Rebel Flyer

How much does the BME 150 weigh compared to the 3W motor or the radial motor? Can someone send me a link to BME?
If I go with a BME, Will I have to install every system and servo AHEAD of the CG?

Thanks

Rebel

didiwatt

My Feedback: (38)

The Moki 250 Radial lists weight at 11.91lbs. BME lists the 150 at 5.58lbs but I think that is without mufflers, etc.

Looks like you would have to counter about 4lbs somehow............

LOL
Paul

onewing

My Feedback: (27)

Rebel,

BME's website: www.bmeengine.com

3W 110's weight: 6.72 lb

I would like to hear your thoughts about engine selection.

Onewing