RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)  
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All Forums >> RC Airplanes >> ARF or RTF >> RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 6/19/2008 11:11 PM   
krproton



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quote:

ORIGINAL: MLDELARUELLE

Hi guys,
She's almost done, but I discovered that the yellow bolts to hold the propeller is too large for my 2 OS 46 AX.
Does exist an adapter ? Or does anyone with a good tip to solve this issue ?

BTW, I'm frightened by the weight compared to my Giles 202 1m80 of wing span which is lighter lighter .....

Thanks
ML


I believe the O.S. .46 AX has 1/4-28 crankshaft threads. Great Planes makes aluminum and brass spinner hubs that may work.

http://www3.towerhobbies.com/cgi-bin/wti0001p?&I=LXK241&P=7

If the threaded portion of the crankshaft is too long, you may have to cut it, or use extra washers. The Higley brass hubs are nice toothey are heavy, brass, but that shouldn't matter, but you'll need a rod of some sort to tighten it.

Tim

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 6/20/2008 12:39 AM   
Augie11


 

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Status: offline 		Higley also makes a heavy brass spinner hub AND a brass safety nut to go behind it. Used together they make a nice looking combo and both are tightened with a wrench.

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 6/20/2008 7:58 AM   
camdyson



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From: Bairnsdale, AUSTRALIA
Status: offline 		As an alternative to safety nuts, I've always wrapped my crankshaft thread with plumbers tape (that stretchy white stuff) then screwed the spinner nut straight on. NEVER had one come off, or even loosen.

Cam

p.s. Still working on mine as time permits - just finished adding all the extra aluminium panels, rivets etc and rubbing the whole lot back with 400 grit. Next is to prep surface, then paint all the panels, weathering etc.

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 6/20/2008 11:40 PM   
timothy thompson


 

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Status: offline 		hey tim she flew with full power for the first time today! 6s2p 10,000mah flew 20 minutes at 75% power and still had plenty of power. there are 2 4s 5000mah and 2 2s 5000 in parallel. if one set of batts dies i still can power the entire plane. nice aircraft tim! Should put one out as a kit! 23 # AND STILL FLYS GREAT

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 6/21/2008 4:49 AM   
krproton



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Status: offline 		Hey Tim,

great to hear from you!!!

I guess you FINALLY got some good weather up there! And how's 'bout some pics?!?

Well, keep 'er flyin'.

Tim

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 6/21/2008 7:05 AM   
MLDELARUELLE


 

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From: V - S - F - FRANCE, FRANCE, METROPOLITAN
Status: offline 		Hi
Thanks guys for spiner hubs.
Perhaps, it could be said in the documentation that the spinner included can be used on x, y , engines, but z. In order to order them with all the other stuffs needed.
It would avoid me to pay shipping costs.

See you
ML

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 6/21/2008 7:47 AM   
timothy thompson


 

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Status: offline 		tim i was working on my wingspan b-17 and put this off. ill get pics for you. those axi 4130-16 are nice motors! she fly lile a big trainer

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 6/22/2008 7:10 PM   
toreo


 

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From: Kazan, , RUSSIA
Status: offline 		I put 20 perfect photo into my blog
http://forum.rcdesign.ru/index.php?automodule=blog&blogid=261&showentry=4913

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 6/23/2008 4:29 AM   
mtaboram


 

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From: Tegucigalpa, HONDURAS
Status: offline 		Nprmand: Did you take the´pictures of your brakes installation? Could you give some hrlp how to set the brakes using the JR 9303. Do you use a mix with down elevator to activethe breaks? I really ap´preciate it.

Regards

Marlon

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 6/24/2008 5:54 AM   
nemesis4u



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From: Bryan, TX, USA
Status: offline 		JUST SO YOU GENTS know.... WE are so impressed with the quality of the WINGSPAN MODELS Bomb Release Mechanism and bombs
we will be adding these accessories PERMANENTLY to our ONLINE STORE!

www.vqwarbirds.com
info@vqwarbirds.com

Thanks again MIKE!!!

-TOMAS
VQ WARBIRDS

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 6/24/2008 3:27 PM   
rc74


 

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From: west chester, OH, USA
Status: offline 		Here is a few pics of my Bomb bay with a 8 bomb payload. I can release 4 at a time or all 8 at a time. Bay and bomb rack made out of scraps and 2 servos. Bombs made out of plastic dowl rods. Ron

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 6/29/2008 2:50 AM   
Heat1960


 

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From: Carleton Place, ON, CANADA
Status: offline 		Hey Brent (Slamdance64). You get the urge to start building your B25 after being at the Giant Rally? Another week and mine should be ready to maiden. Should be ready for next Saturday's event.
Cal.



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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 6/29/2008 3:51 AM   
slamdance64


 

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From: Vanier, ON, CANADA
Status: offline 		Hey Cal, (Heat1960), yes, more than ever. I can't wait to see all of our B-25's at the field. Of course I will be in stealth mode while ripping along behind you guys at low level!!!
I can't wait to see how yours turned out. Drop me a line when you are going flying and I can check it out (another set of eyes).
Brent

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 6/29/2008 8:58 AM   
MLDELARUELLE


 

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From: V - S - F - FRANCE, FRANCE, METROPOLITAN
Status: offline 		Hi guys,

Mine should be ready to maiden next week. Just a question about balance point.
Without lead, the BP is 137mm from the LE.

In your opinion, do I need to install lead in the nose ?
How the BP is set on yours ?

Thanks
ML

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 6/29/2008 3:26 PM   
Heat1960


 

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Status: offline 		Hi ML, With the recommended Hydrimax 4200 4 cell battery installed under the front nose area as per the instructions mine balanced out perfect without having to add any additional weight at all.

Cal.

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 6/29/2008 8:02 PM   
normandouellette


 

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Status: offline 		Balance it gears up and you will get perfect full flaps landing. Also the plane behave tail heavy until you first trim it to perfection. You are better off noze heavy at any time. Mine is bal;anced gears up and flys great.

Normand

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 6/29/2008 10:20 PM   
MLDELARUELLE


 

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From: V - S - F - FRANCE, FRANCE, METROPOLITAN
Status: offline 		Hi guys
I use 2 packs : one 3600 NimH and one 2000 Nimh as backup.

Balance gears up : with gears up, the CG shoud go backward. That's mean your's is balanced forward isn't it.
see you
ML

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 7/3/2008 1:45 PM   
europatc74


 

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From: summit, NJ, USA
Status: offline 		Have just started to get this bird in the air and have experienced a problem with the Robart retracts. I fly off a grass runway and find that the front strut bends back. This happened both times I've had the plane up. Seems the pin that secures the strut is made of a soft metal and bends with any form of force on it. Easy enough to fix but what a pain. Any one else experiencing this same problem??? I intend to contact Robart for a solution. Dave...

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 7/3/2008 2:54 PM   
MLDELARUELLE


 

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From: V - S - F - FRANCE, FRANCE, METROPOLITAN
Status: offline 		Hi
This is a known problem on this thread. But it happenned only when landing on rougth grass as far as I know.
The issue is this retract is made for lighters aircrafts.

ML

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 7/3/2008 3:17 PM   
normandouellette


 

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Status: offline 		Hello there Europact74,

I think I was the first one reporting this problem on this thread back in november 2007 and I fly off a grass runway. The event page 23 post 574 and the fix page 55 post 1355. There has also been 2 or 3 other reports of this. I have a fix and solved this problem. At least so far. My B-25 has over 70 flights now and I even had to replace the front wheel due to wear!!! ( plastic hub...). I have posted a picture earlier in january or february and all I did was insert a rubber bushing on the oleo where it squeeze to absorb the shock when it is a bit rough. I have also inserted a picture of the simple fix...military secret!!

The 3/8 strut is designed for 12 pound max planes and the B-25 is well over 20 lbs. when the weight shifts to the front on landing or take off roll the strut is simply unable to resist the abuse and this is mainly due to the shock. I found that the rubber bushing was a very simple solution and absorbs most of that shock.

Normand

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< Message edited by normandouellette -- 7/24/2008 5:16 PM >

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 7/3/2008 3:30 PM   
normandouellette


 

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From: Laval, QC, CANADA
Status: offline 		Mdelaruelle,

Yes the CG is slightly forward as per the book but does not behave that way at all. it is in perfect balance in the air. Be prepared for down pitch trim when airborne because when you place it "visually neutral" it will behave as if it is tail heavy and climb. Once trimmed it is so easy to fly and predictable with no bad habits it may become boring. I now take out my B-25 for special events only. It always draw attention and an absolute silence from fellow members watching. I wish they would behave the same way when I fly my corsair, spitfire, P-51...all those flying missiles with all their "gremelins" and bad habits that requires so much attention and skills. It seems that the easy to fly B-25 is the only plane that makes me stand out but this is the secret of whoever fly this Top Flite B-25, it makes us "aces" at the field...if only they knew! Ha Ha!

Normand

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 7/3/2008 6:11 PM   
fytrjok


 

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Status: offline 		I wanted to relate an interesting experience I've had with this wonderful aircraft. Ever since I maidened it back in April, I've been perplexed by the seeming instability I've had to deal with when landing. The plane just would not "lock in" on final and always seemed to dance around and yaw from side to side, especially just as I neared the threshold and started my flair. As a result, I always came in hot and usually had more than one go-round'. Well, after I bellied her in due to an air system malfunction( the retaining nut on the Robart air valve came loose and the servo just pushed the valve out of its mount), when I was making repairs to the belly(resheeted with 16th inch ply from the midline out two inches from front gear bay to about 6" aft of the bombay), I had the transmitter on and was making some adjustments to the bay doors. I noticed the left rudder seemed slightly out of position. With the transmitter sitting on the table, the rudder just centered by itself! Hmmm. I picked up the transmitter, put my thumb on the left stick...the rudder moved about an inch! I found that the servo moved the rudder over an inch to either side with me only moving the stick to advance or retard the throttle. There was no problem when the rudder stick was moved to full deflection...everything seemed to work fine. After some detective work I determined that I had a bad HS81 MG. RC Hobbies of Denver happily replaced the servo. The first flight after the replacement was uneventful with the exception of the landing. I made my landing break and dropped gear, reduced throttle, flaps to 1/2. Turned to final, flaps to full pulling the throttle back a little and allowing her to descend. Once I lined up on the runway I waited for the "landing dance" which this time didn't happen! She came down the pipe rock solid, locked in and executed the most lovely nose high landing. WOW, what a difference! I taxied back thinking about what Krproton said about nice SLOW landing speeds. Now I see what he meant! This plane is great, now even better since everything is functioning properly.

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 7/3/2008 6:54 PM   
krproton



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Status: offline 		WHEW fytrjok!!!!

I'm really glad your got your plane sorted and can now truly enjoy all the positive characteristics of this model!!!

By the way, for anybody who may live in the midwest, the company asked if I would bring my B-25 to the D.O.G.S event in Dayton, OH on August 29, 30 & 31. I would be honored to meet some of you if any of you are considering attending. I would also be honored to get a group photo of all us B-25 pilots (now I have to keep the thing together until then!!!). I'm not trying to pose as any kind of celebrity - I'm just a guy behind the scenes. There will be many pilots who fly better than I and many planes nicer then the B-25 ARF, but I'm just saying...

< Message edited by krproton -- 7/3/2008 7:22 PM >

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 7/3/2008 6:55 PM   
rnordeck



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From: Riverton, WY, USA
Status: offline 		Fytrjok,

Well I missed getting "down" for Warbirds over Denver, so I / we are all waiting for new B-25J video posts. Did U get a Squadron flight? Won't admit how many times I have watched your 1st pair of '25's video!

1st build Question: with the OS FS-70's did U install with neddle valve / extension Up or Down? Anyone?

Thanks,
aka Lt. I. B. Narly

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RE: Top Flite B-25 ARF (Tecnical, tips, suggestions) - 7/3/2008 9:59 PM   
europatc74


 

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From: summit, NJ, USA
Status: offline 		Thanks for the reply about the nose gear. I'll look into the fix. Robart seems to think the strut spring is too strong; transfering the stress to the pin. Suggested cutting some coils or installing a softer spring ?????????? They also stated the pin is made of Hardened steel. Look like Hardened steel to you guys ??. Anyway, I ordered a couple of new pins and I'll check out the (secret) fix. Thanks for the help. Dave. It is funny, how Quiet the field gets when the 25 begins to taxi........

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All Forums >> RC Airplanes >> ARF or RTF >> RE: Top Flite B-25 ARF (Tecnical, tips, suggestions)
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