booker-RCU

My Feedback: (43)

I have 2 OS 50 SX's for my B-25. When Brad brought up the question about moving the engines back on the mount and using the Pitts style muffler I already had them mounted according to the instructions. As I looked at them I decided to try moving them back. I mounted the front engine holes in the aft mount holes on the engine mount and drilled new holes for the back. When I mounted the cowl, it fit perfectly with only a 3/4" X 2" cut out forward of the plywood cowl mounting ring for the exhaust pipes.I used the Bison Pitts muffler and did not have to cut the ring. As you can see it is a very clean installation. The heavy brass Higley prop hub nuts should help with the CG situation.
The fueling mount on the side is a little much but It's what I had so I used it. I also am installing the Twinsync with glow drivers.
Has anyone flown the B-25 on the 2S engines? I'm still a while away from getting mine in the air.
Galen

MLDELARUELLE

Hi,
I did almost the same thing. I used 2 OS 46 AX with Pitts muffler, except I mounted the cylinders horizontaly.
It avoid to cut the ring.
I didn't install the dummy radials

It flyes well like that.
Regards

ML

booker-RCU

My Feedback: (43)

ML
Glad to hear it flys well on the 46's. What size prop are you using?
Galen

CCFPILOT

Has any one come up with a good way to install the B25 nose machine gun? The Top Flight way of using 4 small rubber bands is not very good. I have been using one slightly larger rubber band, which I think is better, but still leaves something to be desired. Any suggestions???

RCGuy41

Galen,

Very nice job repositioning your engines; I'm still planning on moving my engines back (sometime this winter.) Since I have already cut the cowls and ring I will need to reinvest some cash for new cowls and rings to include 2 pitts mufflers. As for props I'm flying APC 11X8 and turning a respective 10,500 RPM on my OS AX 46's. A majority of builders have used an 12X8 prop, also based on preference, some have used 12X8 three bladed, I personnally have tried a three bladed prop and found I get better performance out of a two bladed prop by some + 400 RPM difference. Good luck with your plane, post some results when you have her flying.

Brad

MLDELARUELLE

Hi,
I use two 12x6. I take off in 70 meters.
The top speed is a little to fast in my opinion.

Does anyone tried and compared different props with pitts mufflers ?
OS recommends 10.5x6, 11x6-8, 12x6-7.

ML

Mirco

Hi

What about installing SAITO FA-82? There are some posts showing the SAITO FA-82 installed at the 06:00 position. Would it be possible to install the FA-82 at the 02:00 position to use the premoulded exhaust position?

regards

Mirco

asnook

Regarding the nose gun assy I modified it the following way.

Cut the machine gun in 2 about 1/2 inch outside the canopy, drilled a hole in each end and glued a threaded rod into 1 end. On the other end I glued a nut and strengthened it by putting some heat shrink around the nut and surrounding area..This way I just un screw it when im not flying!

Heat1960

Hey slamdance64. Brent how is the build going? I didn't get a chance to maiden mine yet.

Calvin

slamdance64

Hey Calvin,

I have the motors installed, the servos installed and have only a few evenings left before the majority of construction is completed. I will go back over the winter and finish the landing gear doors and then add the details, new fiberglass nose, and rivets and paint. I wasn't planning on doing my maiden until the spring. I have taken over the living room of my small apartment for construction. I love how quickly the B-25 comes together. Since this photo was taken, I have since glued in all control surfaces, and have to finish the push-rods which I will complete this evening/weekend.
[img][/img]

I will call you so I can come over and look the plane over, and drop off the pictures from the warbird fun-fly this summer.

Brent

elojim

Hi,

does anybody use wheel with brakes ? I've got the glennis wheel and brakes and i'm looking for the best way to fix the pneumatic line along the gear. Some picture will help me,

thanks,

Emmanuel

norm

Salut Emmanuel,

Well I use wheels with brakes on my B-25 and I ran the ait tube close to the trailing link and make sure that the tube is not pinched when the wheels are retracted or get "wedged" between the retract ans the armature in the nacelle to avoid the gear to jam. You run the airline in ftont of the strut and it does the job.

I use the Robart wheels and brake on my model. It is not a must but definitely cool and I used it often so far and saved the noze canopy a few times so far...the best use for it is a run up on the field before t/o sure gets attention.

Bonne chance!


Normand

MLDELARUELLE

Hi Emmanuel,

I do not use wheel brakes. It's no use to install it if you land on the grass in my opinion.

Watch my first landing here : http://video.google.fr/videoplay?doc...72806762&hl=fr
Regards
ML

elojim

Hi Normand,

thanks for the pictures et your explanations !

kochj

Finally,

Someone did it!!!

http://www.youtube.com/watch?v=jBOmR...eature=related

norm

RCDON,

So far the most impressive TF B-25 in my opinion souinds just right. "wrrrrr" I whanted mine with the FA100T and the hobby shop talked me out of it back in october 2007.

Kudos to you RCDON.

Very nice flight and impressive sound

Normand Ouellette

cobi.p

hello

on my TF B-25 i'm installing 2 RCV 91 CD .

and that is the true right sound .

cheers - cobi

Airnondas

My Feedback: (6)

That has to be the best sounding B-25 I have EVER heard, after hearing that all the rest I have heard, sound like garbage..

_______________________________

Airnondas.

JackL

My Feedback: (7)

Has anyone flown the TF B-25 with OS .55AX engines? It looks like they would fit completely in the cowl using Bisson Pitts style mufflers. I'm trying to decide what 2S to go with. Would like to use a couple of Saito 4S, but it is not in the budget for this build.

norm

jack,

A pair of OS55 is a great choice for 2S. You should consider 12 x 6 APC props for those engines. I fly a Dual Ace with a pair of OS55 with 11 x 7 APC and get awsome performance.

It will sound good with the Bisson Mufflers, just another harmonic from 4$

Good luck with your project, Just flew my plane today and it is always an enjoyment.

Normand

grahamaberdeen

hi guys...just spent a few happy hours reading threads on b25....im convinced and converted now....just placed my order for my beast not many of them in scotland os surpass 70....robartretracts....mmmmm spartan gyro..? any comments advice would be apreciated

graham

krproton

Hello Graham.

Welcome to the site. "Ef et's no Scoiish it's crap!" That's from a skit on Saturday Night Live with Mike Meyers. I'm of Scottish descent, so I hope you don't mind me repeating that!

Oh yea, back to the B-25. I don't have any more advice other than what's already been written here.

Best of luck and keep us informed of how your build is going.

Tim

BT Bones

My Feedback: (1)

I may have missed it, but what servos did you guys use and what locations were they used. This is my first warbird. I have 29% and 33% 3D airplanes with high end digital servos. I did not see the need to use those flying scale flight. Looking forward to hearing responses on what you suggest.

krproton

Bones,

I used just wat was mentioned in the instruction manual - standard servos everywhere, except at least 50 oz. in. torque servo on the elevator and mini servos on the rudders. You certainly don't need digital or metal - gear servos for this bird. You may want to consider ball bearing servos though just for slightly more precision. This is a lumbering warbird, not a 3D plane.

I'm sure others will have valid opinions.

Enjoy!

Tim

RCKen

My Feedback: (9)

Bones,
[link=http://www.rcuniverse.com/magazine/article_display.cfm?article_id=1011]RCU Review of the TF B-25 Mitchell Bomber[/link]

I used the servos recommended by Top Flite in my review of the plane, as you can see in my review. Basically, they are all standard servos with the exception of the elevator which is a high torque with 50 oz of torque, and the rudders which are mini servos with 35 oz of torque.

Ken