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-   -   Top Flite B-25 ARF (Tecnical, tips, suggestions) (https://www.rcuniverse.com/forum/arf-rtf-75/6494380-top-flite-b-25-arf-tecnical-tips-suggestions.html)

mike-rc 10-30-2007 06:35 AM

RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
 
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Here are some pictures of the Power 60 mounted.
Hey Tim, I think Hobbico missed out on the opportunity to sell some Rimfire motors by not providing a recomendation for them.
I think alot of people like myself would prefer electric power for this plane. I know the Surpasses make a nice sound, but I can't think of one other advantage they would have.

rcmorrow 10-30-2007 09:15 AM

RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
 
Mike, nice job with the motors and mounting of them. Did you purchase pre-made aluminum mounts for your E-Flite motors or machine the mounts yourself ? They look like they fit perfectly in terms of all dimensions (length for cowl clearance and also the fit on the firewall).

mike-rc 10-30-2007 10:02 AM

RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
 
Esprit model sells these mounts (espritmodel.com). They are made for the AXI, but the E-Flite has the same mounting dimensions. I only had to cut down the width of the plate against the firewall to fit between the protruding plywood. The standoffs are exactly 2", making the total lenght 5" per the manual.

timothy thompson 10-30-2007 12:28 PM

RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
 
1 Attachment(s)
here are bomb bay pics

timothy thompson 10-30-2007 12:32 PM

RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
 
the gap you see between sections is the hatch for the lipos. that way my bomb bay will be 100% scale. wen i ordered my axis the person i spoke to said eflite copied there design. i called e flite and asked if an axi prop mount would fit. I was told those holes are there for holding the motor during construction what liers!!!!!!! the axi hub mounts perfect on the eflite.

norm 10-30-2007 12:36 PM

RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
 
Hello Mike-rc,
About the wood levers
You are right about the levers. I'll try to make my own from a 1/8 aluminium plate from the local hardware store. I heard it "scroutching" when it moves the doors..Better to make those little improvements now, it wont last anyway, the litttle piece is busy with the load it has. To anyonre who intend making the same please do not gorget to wear gogles and gloves because After cutting and shaping with a dremel it will throw metalic splines all over you and they penetrate!!! (I know). Mike, if you have any other suggestions, please let me know. Thanx

mike-rc 10-30-2007 12:55 PM

RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
 
It would be great if I could get a drawing or data file on that part. If I had the designed dimensions like the radii and all there center points I could easily set up a CNC machine here and make a bunch of them. Without the specs I would need to measure the wood part on my coordinate measuring machine and make up my own drawing.

pettit 10-30-2007 01:08 PM

RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
 
Isn't anybody assembling this plane just as it comes out of the box, except for me?

timothy thompson 10-30-2007 01:26 PM

RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
 
no rivits and everything man! i see one of the stringers is off so its been fixed. Pics really let you see what is going on. Is anyone going to mass produce those levers in aluminum i would have no skill to do it.

nemesis4u 10-30-2007 01:40 PM

RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
 
timothy thompson,,,

-Tomas here.... just got in (2) TF B-25s... one for me and hope to get my wingman Mike to buy the other one....

Please if you can get some templates for your bombbay conversion that would be awesome!!!

-I am planning on installing a working bomb release for missions....

good work!!!

-tomas

mike-rc 10-30-2007 01:45 PM

RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
 
I am going to bring a lever in to work with me tomorrow and take some measurements. If I set up one of my machines to make them I will probably make about 30 of them.

p39 10-30-2007 02:06 PM

RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
 
Hey, Dick. I'm doing mine out of the box with the exception of the Robarts. I'm thinking alot of the great flying characteristics come from the light weight and wing loading. That means keeping the add ons and extra detailing/servos wiring to a minimum. Going with the recommended os 70 four strokes on mine. Never had a flame out on one yet. The recommendation of keeping them a bit on the rich side is key... matching them up not by leaning one out, but richening one engine to match as close as possible the other one. I'm figuring this isn't a full blown scaled out plane anyway. It will make a wonderful first twin "trainer" for someone plus it wil have the great looks and wow of a warbird.

norm 10-30-2007 02:30 PM

RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
 
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att Mike re levers: Make some for me ...I'll wait for some news of success on your behalf tomorow?

About Bomb bay, I v saw on rc-warbird some pictures of a bomb bay door opening system and hinging system which seems interesting. A 260 oz retract servo would certainly actuate a system like that. Seems like a good idea for the mechanism of the bomb bay doors.

flaviosi 10-30-2007 03:11 PM

RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
 
Timothy,


here are bomb bay pics
It's awsome!!!! I'll build it too! Please, keep sending the pics along with some explanation, ok? I'll save it for later.

Flavio


flaviosi 10-30-2007 03:26 PM

RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
 
Guys,

I need your help and I'll need it real bad.

Tower Hobbies postponed availability of the kit for late November and the local distributor in Brazil won't have it before late December.

I need somebody to check his/her local hobby shop if they have the B25 in stock and if they would ship it to Brazil ASAP. If so, just give their phone number and I'll take it from here... :)

Would anybody do that for me, pls? Pls?

Flavio

flaviosi 10-30-2007 03:34 PM

RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
 
Hi, guys,

I'm coming up with a real weird idea, but I think it might work...

I'm going electric, right? So, theoretically, I could move the engine one in each direction, right?

What if I use Vario Props, using + pitch in one and - pitch on the other, revving one in each direction?

Maybe it's very stupid what I'm saying... If so, please, be nice... :)

But if it's not, I'll try to use the Vario Prop (which looks real scale) in a size proportional to the full scale prop and test the best pitch for the engine, on stand. Then, use opposite pitch on the other engine, revving it reverse, just like the real deal.

Let me know what you think?

Flavio



Flavio

mike-rc 10-30-2007 03:43 PM

RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
 
I was going to counter rotate the motors also. I even bought the props for it. Then it dawned on me that the thrust angles are designed for both motors to be running counter clockwise. I may be wrong, but counter rotating props might not work so well. The rudders are right behind the props anyway, so it probably handles fine on the ground.

flaviosi 10-30-2007 03:57 PM

RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
 
Mike,


The rudders are right behind the props anyway, so it probably handles fine on the ground.
I'm pretty sure it will handle great with both props revving the same direction but I tought about counter rotating them for the sake of the scale...

Flavio


p39 10-30-2007 04:04 PM

RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
 
Not to sound like I haven't done my research-- but did the '25 have counter rotating props? I know the '38 did....

flaviosi 10-30-2007 04:16 PM

RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
 
P39,


Not to sound like I haven't done my research-- but did the '25 have counter rotating props?
Oops!! I thought it was default in all the twins... It's not?

Flavio

nemesis4u 10-30-2007 04:23 PM

RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
 
krproton ,

WHAT SIZE AIR TANK did you Use?

OK,,, I am going to use the 2 3/4 nose and 4" main ROBART WHEELS... Like the look better than the stock foamies...
Ordered the ROBART GEAR ALREADY... of course it is backordered....

I will add the bombbay... and some release mechanisms...

planning on a modified colorscheme.....

THANKS,

TOMAS

nemesis4u 10-30-2007 04:26 PM

RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
 
BTW.... mike-rc ... I will take (2) sets of arms for (2) TF B-25s...

let me know where to send the $$$ when they are ready....

Please and thanks,,,

-TOMAS

flaviosi 10-30-2007 04:48 PM

RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
 
Mike,


If I set up one of my machines to make them I will probably make about 30 of them.
I'm down for some too. I can Paypal.

Thanks,

Flavio

timothy thompson 10-30-2007 04:53 PM

RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
 
no contrarotating props . mike im in for a set

Hellcat716 10-30-2007 05:12 PM

RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
 
1 Attachment(s)
The glow engines have the full amount of power down to the last drop of fuel as the electrics lose power as the batteries drain. Also the glow engines will have better performence because the plane becomes lighter as the fuel burns. I am going with the new YS 63-S engines using the Graupner 12x7 three blade props. I have a lot of faith in YS engines over the past years that I will not be using on board glow. I can't remember the last time I had a YS engine quit. Their performance is unmatched in my opinion if the engine is set up correctly and broken in correctly. I am using Tru-Turn prop hubs. If you need them for this engine, call Bob at Tru-Turn and he will make a set for you.


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