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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 6/19/2012 10:14 PM   
Seamus OLeprosy



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From: TrimCo Meath, IRELAND
Status: offline 		Hi guys hopefully someone can help.
I am going the cheaper all I can afford two stroke power route.
I made up the right hand power pod and there is a straight forward route to the trottle but on the left hand side the servo is on the opposite side to the trottle giving a very messy route to the carb.
Has this problem been solved here?


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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 6/19/2012 11:15 PM   
rcnut101


 

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Status: offline 		You should have the engine pods set up identical. The only difference in the two in thrust angles. Pictures would be very helpful.

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 6/19/2012 11:24 PM   
Seamus OLeprosy



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Status: offline 		RC have you buitl one of the B5's


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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 6/20/2012 12:20 AM   
rcnut101


 

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Status: offline 		Um, Yes, I built one in 2 weeks. They are pretty straight forward. There is two location for throttle servos.

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 6/20/2012 3:12 AM   
RCGuy41


 

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Status: offline 		Seamus OLeprosy,

Hi, I had gone the cheapest rout also when it came down to engine sellection. Currently I have two OS AX .46 2S engines with power box mufflers turning two APC 11X8 props. At full power my engines are turning at 10500 rpm which provides plenty of power to take off from my grass field. After take off and my first turn heading down wind, my gear has been retracted then flaps brought up, I can fly at 2/3rds to 1/2 throttle and stay airborn for ten minutes. After landing I have enough fuel for an additional two minutes of flight if I over shoot or need to go around for another landing attempt.

As for the throttle servo's, they are located on different sides of the nacelle, just try to rout them as strait as possible or if you can engineer a new servo mount which will short'n your servo arm run. Good luck with your build


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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 6/20/2012 6:33 PM   
Seamus OLeprosy



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From: TrimCo Meath, IRELAND
Status: offline 		Here is what I have
As you can see the right/top engine pod has the control rod attached in a nice straight line down the side of the tank to the carb.
But on the bottom/left power pod you will see the servo positions are on the oposite side to the carb and the tank gets in the way.




I was hoping someone might direct me to images of what othere have done to fix the problem



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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 6/20/2012 11:12 PM   
rcnut101


 

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Status: offline 		OKay. I stand corrected. You might be able to turn the the carburator 180 degrees and reaccess situiation.

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 6/20/2012 11:18 PM   
rcnut101


 

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Status: offline 		I just reread the manual and your gonna have to put in the lower position. There is an illustration for it along with a seperate servo mount to stick inside the motor box. Page eleven shows where to mount servo.

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 6/20/2012 11:22 PM   
Seamus OLeprosy



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Status: offline 		Thought of that but the ASP has a back needle adjuster and if you turn it 180 the nipple points forward.
Its only because its a twin and I want the trottles to be 100% reliable that concerns me.


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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 6/20/2012 11:24 PM   
Seamus OLeprosy



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Status: offline 		I'll have a look in the morning thanks

quote:

ORIGINAL: rcnut101

I just reread the manual and your gonna have to put in the lower position. There is an illustration for it along with a seperate servo mount to stick inside the motor box. Page eleven shows where to mount servo.



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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 6/22/2012 9:27 PM   
Seamus OLeprosy



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Status: offline 		I cant believe I'm the only one who had the two stroke throttle problem, anyway here is my solution, any way here is what I did.
Basically a hardwood dowel and a couple of belcranks. All symmetrically assembled so their is no mechanical advantage/disadvantage compared to the other side.



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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 6/22/2012 9:34 PM   
rcnut101


 

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Status: offline 		Excellent job. That will do the trick, Just make sure to lock tight everthing.

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 6/25/2012 12:11 AM   
Speedracer2112



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quote:

ORIGINAL: Seamus OLeprosy

I cant believe I'm the only one who had the two stroke throttle problem, anyway here is my solution, any way here is what I did.



Sorry about the late reply!

I think a lot of folks had the same problem, just different solutions. I just bent the wire around the tank and then turned the arm to face the direction of the trust. Works perfect. Another solution is "Dubro Golden rods". They work on the same principle.

In the photos the throttle settings are identical. The vector of force of are different at the servo but the same at the carb.

SR

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 6/25/2012 7:52 AM   
Seamus OLeprosy



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Status: offline 		 Thanks Speedy, How's she flyin', what motor/prop combo, and did you 
manage to get a replacement yellow dome nut for a two stroke?

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 6/25/2012 1:50 PM   
Speedracer2112



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quote:

ORIGINAL: Seamus OLeprosy

 Thanks Speedy, How's she flyin', what motor/prop combo, and did you 
manage to get a replacement yellow dome nut for a two stroke?


Shes great. More flights than I can count now. Well over 400. Shes a for stroke tho.

Have fun and build her right and you will have just as many if not more.

SR



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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 10/17/2012 3:53 PM   
Fidelity101


 

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Status: offline 		Did you build with those 95s? How was balancing, AUW and wing loading?

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 10/17/2012 5:29 PM   
Mustang Fever



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Status: offline 		I relocated both throttle servos when I put a pair of 55AX's in mine. Was really simple and resulted in short, direct pushrods. Synch is perfect at wide open, and within 200rpm at idle, so I'm well pleased.



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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 10/25/2012 12:31 AM   
Fidelity101


 

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Status: offline 		I just bought a set of retrace only to find out I bought 85 degree mains and the 105 degree nose setup. Apparently I need 90 degree mains and 100 degree nose. Does anyone know if I can change the throw amount myself...or if Robart would be able to adjust them? I bought the retract set for the top flite mentor t-34, thinking they would be the same thing.

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 10/25/2012 1:49 AM   
RCGuy41


 

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Status: offline 		Fidelity101,

You might be able to exchange the T-34 gear for B-25 retracts; I would talk to your local hobby shop first then to Robarts. As for the gear, all throws are determined by the amount of metal removed from each side rail that the actuating camb travels. Talk to Robarts they might be able refurbish your T-34 retracts into the Top Flight B-25 retracts you need, at a cost to you of course.




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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 10/28/2012 1:30 AM   
Fidelity101


 

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Status: offline 		Thanks RCGuy!

My last step before building starts is picking the right engines.

http://www.osengines.com/engines/osmg0900.html
Powerful, cheaper than 81s

http://www.osengines.com/engines/osmg0981.html
Good performance, good fit, expensive!

I know the 81s pull the b-25 around well on 12x6x3 props. Can anyone comment on the 95v installs and performance? I'm guessing the opening in the cowl will have to be wider and the engine will stick out more. Are there any other issues?

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 10/28/2012 4:10 AM   
Mustang Fever



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Status: offline 		The OS 55AX's on mine turn a pair of 12x6x3 MAS props at close to 11,000 RPM on 15% Cool Power. That's good for over 60mph and a total of almost 20 pounds static thrust. Two of them go for $340. (List)

The four strokes you referenced total between 600 and 740 bucks. (List) Am I missing something here?



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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 10/28/2012 4:16 AM   
Fidelity101


 

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Status: offline 		My Cessna 310 has twin 55s. It's a great performer and fun to fly. But I'm really going for the four stroke sound with twins. Better sound, better fuel efficiency.

I am curious about the use of the 95v in the b-25. I'm thinking the prop would have to be bigger, but that probably affects ground clearance. I would get the os 81a, which are 600 for two through tower...but that's a lot of cash! The 95vs are 50/motor cheaper

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 10/28/2012 4:56 AM   
Mustang Fever



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Status: offline 		I guess I don't understand why modelers think four strokes sound more realistic.

The Wright R-2600 Twin Cyclone used in the B-25 turned at 2600 RPM, which works out to 9100 exhaust pulses per minute per engine half, a half being one row of 7.

A two stroke turning 10,000 rpm or so comes a lot closer to that than any four stroke.


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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 10/28/2012 8:09 AM   
Weeso


 

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Status: offline 		As you can see it is an ASP 91 engine which fits easily with no modification

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 10/28/2012 8:22 AM   
Weeso


 

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