Top Flite B-25 ARF (Tecnical, tips, suggestions)
#2526
Senior Member
RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
Mustang Fever, nice nose gear, it should handle any grass field.
Well after my B-25 had sat in my garage for the past year due to other projects; I finaly found the time to fix a few nagging problems, i.e. a striped HS-85 rudder servo gear set, tightend the inner and outer wing panels and add some monokote to the belly just aft of the nose wheel well. Due to to a ground miss hap my fault. All in all, the repairs took less then 8 hour's, the hardest part re-wiring the inner wings. I also changed my props from APC 11X8 2B to 12X7 2B, my engine performance went down with the prop change; I was turning 9700 RPM on two OS AX 46 2S engines.
Last Sunday I took my Bomber to my field and put four good flights on her (sorry no video), the first flight I was very nervous but as I gained my confidence on this big bird my nerves settled down. I now have 20 flights on my B-25 and just love the flight characteristics of this airplane, but noticed one thing after getting everything home, my right engine bearings are starting to feel as if they are grinding, so time to pull the engine and replace the bearings. The other engine is smooth as a babies bottom. I get paid Friday and I will place an order with Boca Bearings for a set for my OS 46 engine.
Well after my B-25 had sat in my garage for the past year due to other projects; I finaly found the time to fix a few nagging problems, i.e. a striped HS-85 rudder servo gear set, tightend the inner and outer wing panels and add some monokote to the belly just aft of the nose wheel well. Due to to a ground miss hap my fault. All in all, the repairs took less then 8 hour's, the hardest part re-wiring the inner wings. I also changed my props from APC 11X8 2B to 12X7 2B, my engine performance went down with the prop change; I was turning 9700 RPM on two OS AX 46 2S engines.
Last Sunday I took my Bomber to my field and put four good flights on her (sorry no video), the first flight I was very nervous but as I gained my confidence on this big bird my nerves settled down. I now have 20 flights on my B-25 and just love the flight characteristics of this airplane, but noticed one thing after getting everything home, my right engine bearings are starting to feel as if they are grinding, so time to pull the engine and replace the bearings. The other engine is smooth as a babies bottom. I get paid Friday and I will place an order with Boca Bearings for a set for my OS 46 engine.
#2527
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
Glad it's going well, Brad.
I have had real good luck with 46AXs turning APC 10x6 props. They'll run all day on 8 oz of fuel, and do about 14,500 rpm on 10%. That's good for over 80mph and about 6.5 pounds of thrust each.
I have had real good luck with 46AXs turning APC 10x6 props. They'll run all day on 8 oz of fuel, and do about 14,500 rpm on 10%. That's good for over 80mph and about 6.5 pounds of thrust each.
#2528
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
Anyone want a $50 rebate? Top flite has a rebate on most of their planes.
http://www.bestrc.com/rebate/big-arf-rebate/index.html
Got a picture too!
SR
http://www.bestrc.com/rebate/big-arf-rebate/index.html
Got a picture too!
SR
#2529
Senior Member
RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
Gents,
There is a TF B-25 for sale on ebay will be their for the next four and a half days, here is the link http://cgi.ebay.com/Top-Flite-B-25-M...item255be1beda
There is a TF B-25 for sale on ebay will be their for the next four and a half days, here is the link http://cgi.ebay.com/Top-Flite-B-25-M...item255be1beda
#2530
My Feedback: (4)
RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
I popped the nose gear shear pin a few weeks back and also took out my nose gear door, cleanly. I plan on winding some music wire springs and adding them to normal Robart hinge pins.
Wass pleasantly surprised as the very low cost of the pins from Robart....at that price, was not worth making my own and I ordered one or two extras...and no shipping change for those I ordered plus some other minor spares
Wass pleasantly surprised as the very low cost of the pins from Robart....at that price, was not worth making my own and I ordered one or two extras...and no shipping change for those I ordered plus some other minor spares
#2533
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
ORIGINAL: Wyoming Cowboy
Ordered 27 feet of extensions yesterday for this beast...
Ordered 27 feet of extensions yesterday for this beast...
Really? Are you going to convert it to a controll line? LOL!
SR
#2535
Join Date: May 2005
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
Guys
Lost my B25 last weekend
Engine out low over some trees, twynsync cut the running engine. Had to open up again to clear the trees and guessed the rong rudder input, death spiral !
Got a new one delivered and will start all over Had many great flights but sometimes $$it happens
Lost my B25 last weekend
Engine out low over some trees, twynsync cut the running engine. Had to open up again to clear the trees and guessed the rong rudder input, death spiral !
Got a new one delivered and will start all over Had many great flights but sometimes $$it happens
#2536
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
Asnook,
Bummer!!! My worst nightmare... engine out, low altitude over trees. Sorry about the loss but it sounds like you're back at it with a new one. Admire your attitude!
Bummer!!! My worst nightmare... engine out, low altitude over trees. Sorry about the loss but it sounds like you're back at it with a new one. Admire your attitude!
#2537
Join Date: Mar 2003
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
Has anybody fitted or thought about fitting a couple of Saito FG14B gassers, do you think that there would be any problems doing so (apart from the cost)?
Peter
Peter
#2538
My Feedback: (11)
RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
Peter,
I have the recommended OS FL-70 engines on mine. With retracts and onboard glow I am at about 20 pounds. Takeoff performance is marginal on grass. If you fly from a hard surface, should be fine. Horizon says the FG14 has similar performance to the FA72 glow. You might want to use a battery eliminator to keep the weight down.
David
I have the recommended OS FL-70 engines on mine. With retracts and onboard glow I am at about 20 pounds. Takeoff performance is marginal on grass. If you fly from a hard surface, should be fine. Horizon says the FG14 has similar performance to the FA72 glow. You might want to use a battery eliminator to keep the weight down.
David
#2539
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
ORIGINAL: Ozmodeller
Has anybody fitted or thought about fitting a couple of Saito FG14B gassers, do you think that there would be any problems doing so (apart from the cost)?
Peter
Has anybody fitted or thought about fitting a couple of Saito FG14B gassers, do you think that there would be any problems doing so (apart from the cost)?
Peter
SR
#2540
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
Hi,
i have the OS 70 FS Surpass on mine. Retracts, wheels with brakes from Glennis, sequencing gear doors (from rcdon). I am at about 21 pounds. No problem to take off from a hard surface but i have to run at less 120 meters. Fly is very realistic.
i have the OS 70 FS Surpass on mine. Retracts, wheels with brakes from Glennis, sequencing gear doors (from rcdon). I am at about 21 pounds. No problem to take off from a hard surface but i have to run at less 120 meters. Fly is very realistic.
#2541
Senior Member
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
The numbers on the FG 14 look good for the Mitchell: 14x6 @ 9200 equates to roughly 52 mph and over 9# of thrust per engine. That's almost identical to what I'm getting with 55AXs and 12x6 MAS 3 blades. The MAX 3 blade might work well on the FG14s as well. They definitely look better than two bladers. The FGs are a little heavier, but part of my balancing routine with the AXs included the heavy brass prop hubs. She does need some weight in the nose.
My advice only: skip the retracts and go with fixed until you've flown it, got used to it, and worked the bugs out. You might want to consider a Fults 1/4 nose strut, as these things are tough on the front end wheel.
My advice only: skip the retracts and go with fixed until you've flown it, got used to it, and worked the bugs out. You might want to consider a Fults 1/4 nose strut, as these things are tough on the front end wheel.
#2542
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
hi guy's,
yes i've already used 2 FG 14 SAITO gasser, they are well sized for this plane, take a look of my first fly:
[youtube]http://www.youtube.com/watch?v=qiOS5Kheorg[/youtube]
i use one tank for the both motor, in the center of the fuse ( be sure to use for that 2 complete separate fuel line) so by this you can place the ignition in the nacelle just in place of the tanks. i've use too my e-retract too win weight and place too the final weight was 9kg=19.80 pounds .
the fly was good with this gasser, but i've never find how to tune well these motor, they're very hard too set up because they consume too low.....i've crash my B-25 because i've loosing one motor in flight, after that i've buy an 90 trainer too mount these motor to tune them, and too rebuilt the B-25 after having confidence in these motor.
but unfortunatly i havent' succed in that and after many many fly with the trainer and many many shut off in flight, i've sold my both saito's.
may be it's me .... but i've never set up fine these motor.
yes i've already used 2 FG 14 SAITO gasser, they are well sized for this plane, take a look of my first fly:
[youtube]http://www.youtube.com/watch?v=qiOS5Kheorg[/youtube]
i use one tank for the both motor, in the center of the fuse ( be sure to use for that 2 complete separate fuel line) so by this you can place the ignition in the nacelle just in place of the tanks. i've use too my e-retract too win weight and place too the final weight was 9kg=19.80 pounds .
the fly was good with this gasser, but i've never find how to tune well these motor, they're very hard too set up because they consume too low.....i've crash my B-25 because i've loosing one motor in flight, after that i've buy an 90 trainer too mount these motor to tune them, and too rebuilt the B-25 after having confidence in these motor.
but unfortunatly i havent' succed in that and after many many fly with the trainer and many many shut off in flight, i've sold my both saito's.
may be it's me .... but i've never set up fine these motor.
#2543
Senior Member
My Feedback: (2)
RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
Chris:
Too bad about the engines and your B-25. I haven't used anything but OS AX series for a long time, but even those require a good breaking in and fine tuning to get them running their best. I've found that there is a definite "sweet spot", the combination of high and low end needle settings, that each engine can be tuned to, but it takes time, patience, and a bit of experience to achieve. For example, I have a 75AX in a 1/7 Mustang that's inverted, and since I tuned it, will run for 3 or 4 minutes at a 2150 rpm idle and still come back clean to full power.
Too bad about the engines and your B-25. I haven't used anything but OS AX series for a long time, but even those require a good breaking in and fine tuning to get them running their best. I've found that there is a definite "sweet spot", the combination of high and low end needle settings, that each engine can be tuned to, but it takes time, patience, and a bit of experience to achieve. For example, I have a 75AX in a 1/7 Mustang that's inverted, and since I tuned it, will run for 3 or 4 minutes at a 2150 rpm idle and still come back clean to full power.
#2544
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
ORIGINAL: christophe31
hi guy's,
yes i've already used 2 FG 14 SAITO gasser, they are well sized for this plane, take a look of my first fly:
the fly was good with this gasser, but i've never find how to tune well these motor, they're very hard too set up because they consume too low.....i've crash my B-25 because i've loosing one motor in flight, after that i've buy an 90 trainer too mount these motor to tune them, and too rebuilt the B-25 after having confidence in these motor.
but unfortunatly i havent' succed in that and after many many fly with the trainer and many many shut off in flight, i've sold my both saito's.
may be it's me .... but i've never set up fine these motor.
hi guy's,
yes i've already used 2 FG 14 SAITO gasser, they are well sized for this plane, take a look of my first fly:
the fly was good with this gasser, but i've never find how to tune well these motor, they're very hard too set up because they consume too low.....i've crash my B-25 because i've loosing one motor in flight, after that i've buy an 90 trainer too mount these motor to tune them, and too rebuilt the B-25 after having confidence in these motor.
but unfortunatly i havent' succed in that and after many many fly with the trainer and many many shut off in flight, i've sold my both saito's.
may be it's me .... but i've never set up fine these motor.
Os 81alphas! Mine could go for 17-20 minutes on a tank of 15%. I land at 9 minutes for safety. Sound is PERFECT!
SR
#2545
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
ORIGINAL: Mustang Fever
My advice only: skip the retracts and go with fixed until you've flown it, got used to it, and worked the bugs out. You might want to consider a Fults 1/4 nose strut, as these things are tough on the front end wheel.
My advice only: skip the retracts and go with fixed until you've flown it, got used to it, and worked the bugs out. You might want to consider a Fults 1/4 nose strut, as these things are tough on the front end wheel.
SR
#2546
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
a french guy, called me because he know by forum that i've bought FG14, he had the 20, and have the same problem than me: no way to set up correctly.
If i've bought gasser for that plane it's about the reliable of all gasser motor, but i need to tell that these motor can't do that.
I've found in germany 15cc gas in 2 stroke, when i have some time, i'll ordered one and try it.
If i've bought gasser for that plane it's about the reliable of all gasser motor, but i need to tell that these motor can't do that.
I've found in germany 15cc gas in 2 stroke, when i have some time, i'll ordered one and try it.
#2547
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
i have had my b-25 ready sinse christmas but just got around to flying it. great flying plane but my nose gear is bending on very soft landings. anyone got a fix for me? robart gear by the way.
#2548
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
ORIGINAL: lfierro1
i have had my b-25 ready sinse christmas but just got around to flying it. great flying plane but my nose gear is bending on very soft landings. anyone got a fix for me? robart gear by the way.
i have had my b-25 ready sinse christmas but just got around to flying it. great flying plane but my nose gear is bending on very soft landings. anyone got a fix for me? robart gear by the way.
I need to get mine up in the air again soon... A lot of wind in Indiana lately. Great flying plane though!!
djstar
#2549
Senior Member
RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
ORIGINAL: lfierro1
i have had my b-25 ready sinse christmas but just got around to flying it. great flying plane but my nose gear is bending on very soft landings. anyone got a fix for me? robart gear by the way.
i have had my b-25 ready sinse christmas but just got around to flying it. great flying plane but my nose gear is bending on very soft landings. anyone got a fix for me? robart gear by the way.
I love the way my B-25 tqakes off, very scale and fly's like a giant trainer. As for your nose gear, you are performing a flair before touch down and if on grass try to slow down further if possible. If you three point the plane, you will put too much stress on the nose gear and as you have found out it is bending and others have had the gear snap. Call or e-mail robarts and order atleast two more nose gear pins and if you know how to heat treat to strengthan the pin, do so.
#2550
Senior Member
My Feedback: (2)
RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
After having two planes with retracts, and spending more time messing with retracts than flying and having fun, I put fixed gear on my B-25. The mains are very tough and trouble free. This is what I used for the nose gear, which was too skinny and bent on almost every landing:
http://www3.towerhobbies.com/cgi-bin...&I=LXH133&P=ML
It is trouble free and when you use it, you'll need almost no weight in the nose to get the CG correct. All that's necessary for installation is to drill the plastic gear block and the tiller bar out to 9/32.
I have made some terrible landings with this aircraft and had no damage to either the gear or the structure supporting it. Robart is full of it. Their gear is simply not strong enough for this application, and they should do it over or pull it off the market.
http://www3.towerhobbies.com/cgi-bin...&I=LXH133&P=ML
It is trouble free and when you use it, you'll need almost no weight in the nose to get the CG correct. All that's necessary for installation is to drill the plastic gear block and the tiller bar out to 9/32.
I have made some terrible landings with this aircraft and had no damage to either the gear or the structure supporting it. Robart is full of it. Their gear is simply not strong enough for this application, and they should do it over or pull it off the market.