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Hangar 9 B-25 ARF: Building and Modifications

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Hangar 9 B-25 ARF: Building and Modifications

Old 12-16-2007, 02:26 PM
  #76  
jollyroger
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Default RE: Hangar 9 B-25 ARF: Building and Modifications

ORIGINAL: jbarnes

Hey Doug, I plan on using electric on mine. I was looking at the Skyshark 50 combo with the 60 amp esc and 5 cell 5k battery. Which Torque motor did you test? Skyshark suggested to me that a 13x8 3 blade is where I want to be with their combo. Love to hear how your's performs. Mine is still in the box until the holiday rush is over. Thanks, Jerry.
Jerry, watch out for the battery packs on those power systems. Steve Neu tested the packs Skyshark RC sells and were found to be weak and very prone to heating up even when used at the proscribed discharge rate. In fact, they got quite hot. I would not use these Lipos if it were me.
The B-25 looks like a great candidate for electric conversion. Right now though it's a bit out of my reach dollarwise, maybe someday......[]
cheers, jollyroger
Old 12-16-2007, 08:39 PM
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Default RE: Hangar 9 B-25 ARF: Building and Modifications

Friend of mine took a couple of pictures yesterday, have posted them [link=http://www.servoframes.com/B25.html]here[/link]. Hopefully more to come.
Old 12-17-2007, 06:50 AM
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Default RE: Hangar 9 B-25 ARF: Building and Modifications

Craig,

NICE!!!!!! looking plane. It looked like you had the three bladed props on? I'm a little worried, I don't have that nice of a runway to use when I fly. I think I,m gonna try and close a paved road to use for at least my maiden. No big deal as the company I work for is the only user of this road.

How long does she roll on take off before you feel she has more than enough speed for a crisp takoff with the included three blades?

How much difference did the 11-4's make with this?


Nice pictures and thanks,
Denny
Old 12-17-2007, 10:47 AM
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Default RE: Hangar 9 B-25 ARF: Building and Modifications

Denny,

That was the first flight of the day and the first and last with the three bladers. They came off right after that and the 11x4's will stay now. They fly the airplane fine and do look nice in the pictures but the 11x4 are noticeably better, I'll stay with them. You can see from the pictures the climb angle with half flap. This is steeper than I like, I pushed it over a little after that. Ground roll on take off I'm not really sure, I let it roll more than needed for both scale effect and to have a little extra in case one engine decides to quit. With half flap I'm sure it could be gotten off quite quickly.

Craig.
Old 12-18-2007, 09:37 PM
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Default RE: Hangar 9 B-25 ARF: Building and Modifications

I am built out enough that I spent the day balancing the B-25. Mine came out fairly nose heavy with OS .46's, CJ retracts and SR 2200 mah 5 cell in the nose. I moved the battery into the space above the nose gear and it balanced at 4.125". I think I am going to stick with this and watch what others are doing.
Old 12-18-2007, 10:50 PM
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Default RE: Hangar 9 B-25 ARF: Building and Modifications

It ought to be a rocket with the .46's, will be fun if one quits. When I get a little more time on mine I'll half fuel one side and see how it goes on one.
Old 12-19-2007, 09:14 AM
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Default RE: Hangar 9 B-25 ARF: Building and Modifications

Any of the electric guys tried three bladed props yet. I'm running the recommended setup for electric and want to use three blade if possible. Thanks, Jerry.
Old 12-20-2007, 03:56 PM
  #83  
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Default RE: Hangar 9 B-25 ARF: Building and Modifications

I applied the flat olive drab covering to the fuselage today. This is my 1st experience with flat covering.
An observation: there is a slight grain effect on the the covering. I covered the fuselage top with 2 large pieces: 1 from the rear of the wing saddle rear to the tail, the other from that area forward. Apparently, I installed the 2 pieces with opposing grain. It affects the light is reflected from it, and almost looks like the 2 pieces are a slightly different shade (even tho they are from the same roll).
My advice: keep the grain going the same way on each part that you cover.

Even that said: I think it looks pretty darned good now.
Old 12-21-2007, 07:49 AM
  #84  
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Default RE: Hangar 9 B-25 ARF: Building and Modifications

I intend running 3 blade master airscrew 13x8's on the eFlite Power 46's.

I've got both but no aircraft yet here in the UK.

So slooooooooow.
Old 12-21-2007, 09:58 AM
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Default RE: Hangar 9 B-25 ARF: Building and Modifications


ORIGINAL: jbarnes

Any of the electric guys tried three bladed props yet. I'm running the recommended setup for electric and want to use three blade if possible. Thanks, Jerry.
I'm running 3 blade M/A 14-7 on my Extreme Flight Torque Revolution motors. With 5 cell on the bench getting 1100 watts per motor. Further testing may require an adjustment in pitch or diameter. I can say i'm not to thrilled about the Master Airscrew prop hubs. They are not very precise and required some rework to get the props to run true. Doug
Old 12-21-2007, 10:13 AM
  #86  
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Default RE: Hangar 9 B-25 ARF: Building and Modifications

Thanks guys. I went to one our electron experts in the club and ran a bunch of numbers. I'm using the Eflite 46's with a 5 cell. I'm going to go with 13/7 two blade to start and then try the 12/6 three blade. I'm at 6K feet in altitude here which impacts our prop selections. Using the 5 cell I should get around 900 watts per motor. Of course this still has to be proven on the bench. I think this is going to be one big expierment. All my buddies think I'm crazy for running a warbird with electrons. Thanks, Jerry.
Old 12-21-2007, 10:53 AM
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timothy thompson
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Default RE: Hangar 9 B-25 ARF: Building and Modifications

you will have the last laugh. The only thing is tie your batts in parallell so the esc sees the same voltage and you do not have a cutoff.
there are diagrams on here and the best guy to ask is Rob schaffer hes an electrical engineer.
Old 12-24-2007, 01:37 PM
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Default RE: Hangar 9 B-25 ARF: Building and Modifications

Thanks for all the updates. Parallel batt setup makes sense. I'm still waiting on my battery combo's from Common Sense. Have the wings all done with the motors/esc installed. Seems to be going together rather quickly.
Old 12-27-2007, 07:15 PM
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Default RE: Hangar 9 B-25 ARF: Building and Modifications

The holidays have given me a little time to build. I'm getting close to the finish here. Still need to add pitot tube and some other details. Here's a few shots.

Jim- I am interrested in seeing your flat covering when you get a chance...bet it looks great.

Anyone out there have a 1/10 scale USS Hornet I could borrow?

Jim- Here are a couple of tail shots...still working on broom sticks. I also found this image the other day. It is definately modified in some way...cowls not right, tail numbers not right.
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Old 12-27-2007, 07:34 PM
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Default RE: Hangar 9 B-25 ARF: Building and Modifications

LOOKS GREAT, Tim! I see that you 'added' some scale windows to the fuselage. How about a pic or 2 of that tail blister?

About my flat covering: I'm considering removing the front portion and re-doing it, so that all the 'grain' is in the same direction.
Old 12-27-2007, 08:31 PM
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Default RE: Hangar 9 B-25 ARF: Building and Modifications

tevans here is an idea figure out the scale dimensions of the flight deck and mark them out in chalk. then see how long a roll you need it could be a contest too
Old 12-27-2007, 09:50 PM
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Default RE: Hangar 9 B-25 ARF: Building and Modifications

ORIGINAL: timothy thompson
tevans here is an idea figure out the scale dimensions of the flight deck and mark them out in chalk. then see how long a roll you need it could be a contest too
Maybe he should set up some giant fans also, to simulate an aircraft carrier speeding along at 20 knots or more, while heading into the winds with the same speed, for a combined 40 knot headwind.
Old 12-27-2007, 11:16 PM
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Default RE: Hangar 9 B-25 ARF: Building and Modifications

Jim and Tim-
I really like your ideas but I think I'm going to hold out for 1/10 USS Hornet! Someone out there has got to have one.
Old 12-28-2007, 07:57 AM
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Default RE: Hangar 9 B-25 ARF: Building and Modifications


ORIGINAL: tevans55

Jim and Tim-
I really like your ideas but I think I'm going to hold out for 1/10 USS Hornet! Someone out there has got to have one.

When you guys find the 10th scale Hornet, Call me and I'll bring my H-9 25 along, probably could not take off with the stock engines but I would be there for deck decorations.LOL.

Denny
Old 12-28-2007, 08:43 AM
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Default RE: Hangar 9 B-25 ARF: Building and Modifications

Tevans55 Where did you find the pilots you have installed? They look great and I will need a few of those for a B-25 I am putting together for a friend. I think they might be what Wingspan Models is offering, but that is just a guess.

Scot
Old 12-28-2007, 09:30 AM
  #96  
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Default RE: Hangar 9 B-25 ARF: Building and Modifications

Scotsman-
These just came out from Century Jet. They are not on their website yet as they are redoing the site. Just give them a call...I believe you can get them painted or unpainted. Ask for Charles. The number is 502-266-9234.

By the way, does anyone know what the canister is above the oleo on the nose gear?
Old 12-28-2007, 10:58 AM
  #97  
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Default RE: Hangar 9 B-25 ARF: Building and Modifications

Anyone going with 4 strokes on this bird?

I have a pair of Saito .56's. Any opinions on how these would work? Will they fit?

Thanks
Bob
Old 12-28-2007, 12:50 PM
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Default RE: Hangar 9 B-25 ARF: Building and Modifications

dont laugh its very posibble to build one. they took off in 500 ft so you would do it in 50. I have seen pics of models so big the builder sits insides and pilots it. It would be similar to any models ship get the bulkheads transverse shape and a side view of the hornet and do plank on frame construcion. It would cost a ton though but possible here is my 6 ft bismarck all scratch built. ive got a few things to finish and a glass case for her. no its not rc
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Old 12-29-2007, 03:54 PM
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Default RE: Hangar 9 B-25 ARF: Building and Modifications

Bob-
I think Saito .56's will work from a power consideration. As far as fit I'm not sure. I purchased 2 extra cowls for mine and the rear opening is about 6.25" in diameter. The cowl is 5" in length and attaches to the firewall at about 4" (there is some adjustability here). near the front of the cowl you will see a ring indentation in the circumference of the cowl...the cowl is 5.6" in diameter at this point. Hope this helps and let me know if you need any other measurements.
Tim
Old 12-30-2007, 12:24 PM
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Default RE: Hangar 9 B-25 ARF: Building and Modifications

Thnaks for the measuremets Tim. That's what I was looking for.

Happy New Year
Bob

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