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NEW KMP 95" B-25

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Old 06-23-2008, 04:53 PM
  #51  
derrickxp8103
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Default RE: NEW KMP 95" B-25

I wonder if two YS 63's would fly the B-25 ?
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Old 06-23-2008, 05:11 PM
  #52  
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Default RE: NEW KMP 95" B-25

put simply, no
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Old 06-23-2008, 05:22 PM
  #53  
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Default RE: NEW KMP 95" B-25


ORIGINAL: derrickxp8103

I wonder if two YS 63's would fly the B-25 ?
Big question is: will ONE of the YS 63's fly the KMP B-25!!!

WHEN one of your two engines quits (gonna happen), AND if you're already above "minimum critical airspeed" (MCA), then you'd want your single remaining engine to continue to overcome drag and keep the aircraft above MCA until you can make an approach. I would guess a single YS 63 could not do that. Perhaps they'd work fine with a TF B-25, but this plane is significantly larger (cross-section = drag), and heavier, than the TF.

Of course, if your remaining engine can't sustain an airspeed above MCA, or if you're under MCA when you loose any engine, then you'd treat it as a deadstick and "establish a glide slope" because you're going to "land", whether there's a runway involved, or not!

Rip
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Old 06-23-2008, 06:44 PM
  #54  
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Default RE: NEW KMP 95" B-25

2 YS 63's would work fine for the H9 B-25 and even the earlier version of the KMP 85" one, but like ALan and Rip stated, not for the 95" KMP. It would be marginal on the TF B-25.

Even on the 85" KMP, it would be kinda iffy. Im putting two saito 91's in the 85" KMP version. A YS 63 is about the same power output as a saito 72 I believe. I orginally considered using the saito 72's and actually bought a 2nd one to do it then thought about more and opted to use larger .91 motors. Mostly because of the MCA Rip mentioned, but also because they can spin a lot larger prop then a saito 72 can.
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Old 06-23-2008, 08:13 PM
  #55  
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Default RE: NEW KMP 95" B-25

HI:

I would go with .91's Of course the RCV 90SP would swing some nice scale props and fit with no holes to cut in the cowl.
Just my 2-cents
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Old 06-24-2008, 08:03 PM
  #56  
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Default RE: NEW KMP 95" B-25

Well,

After talking to Steve at Bob's. I'm sticking with the Saito 100 instead of converting it to RCV 120's. I went to buy the cowls for the RCV and ended up buying another B25 for parts! Just in case I want to change the engines again, and of course, bang it up! If I have any part's left over will sell them to anyone who needs them!

I wanted to keep it as clean as possible but the Saito 100's stick out and the muffler exhaust port is right at the cowl radius.

Having a blast with this build! Looks Great!
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Old 06-25-2008, 12:24 AM
  #57  
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Default RE: NEW KMP 95" B-25

I'd just like to clean up our terminology a bit, Rip. Your theory is right on, but let's keep the acronyms correct.

There is no "minimum critical airspeed". It is just "critical airspeed" required for twins to maintain stable flight with one engine. Minimum would imply some range or similar concept, and there is none.

MCA is, however, an aeronautical acronym for "Minimum Contollable Airspeed" and is an airspeed just above stall. Pilots practice flying at MCA to become familiar with the behavior and feel of the plane just before the stall. The goal, likely obvious, is to help _avoid_ a stall by being acqainted with the feel before the stall occurs and thus the pilot can take corrective action. MCA flight is also used to help the pilot learn fine control of the aircraft. The pilot will need to maintain staight and level flight as well as turn at MCA _without_ inducing a stall or loosing altitude. You learn a fine touch on the yoke and throttle doing this. MCA is set up with the airplane in both dirty and clean configurations.
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Old 06-25-2008, 07:45 PM
  #58  
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Default RE: NEW KMP 95" B-25

Sweet!

Here is my Amateur Build! Wanta Paint Mine?
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Old 06-25-2008, 08:55 PM
  #59  
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Default RE: NEW KMP 95" B-25

I moved my GT Mustang out of the Garage for the B25!

Benefits of being Divorced and having a Girlfriend in South America!
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Old 06-25-2008, 09:01 PM
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Default RE: NEW KMP 95" B-25

Here's Week 5 or so.....
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Old 06-25-2008, 09:03 PM
  #61  
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Default RE: NEW KMP 95" B-25

...
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Old 06-25-2008, 11:34 PM
  #62  
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Default RE: NEW KMP 95" B-25

All,

Well, I will have to eat my own MCA [:'(]

Doing some additional research, MCA is used for both Minimum Controllable Airspeed and Minimum Critical Airspeed. The latter is a defined 'V' speed, refered to as Vmc or sometimes Vmca (also called Mimimum Single Engine Control Speed). It is definied as below. Anyone interested in details about this, please see these web sites. NOTE: Vmca can CHANGE with increased bank angles!!! This has real ramificaitons for us twin pilots. See the accident report link.

[link=http://www.westwingsinc.com/vmca.htm]Definition[/link]
[link=http://www.avioconsult.com/downloads/Suppl.%20Analysis%20limited%20PA-31%20NZ%20-%202002-12-17.pdf]Accident[/link]
[link=http://fergworld.com/cfi/pdf/Multi-engine_Instructor_Quick_Reference.doc]Mulit Engine Instructor Quick Refernece[/link]


Short Definition
Vmca, the minimum airspeed at which an airborne multiengine airplane is controllable with an inoperative engine under a standard set of conditions, is arguably the most important piece of aeronautical knowledge a multiengine pilot must understand. Unfortunately, most of the texts that are commonly available treat this subject inadequately. The purpose of this discussion is to provide thoughtful insight on the conditions under which Vmca is determined and how they affect the airspeed known as Vmca.

When a manufacturer of a light multiengine airplane certifies that aircraft, one of the limitations that must be established as a condition of certification is Vmca. Every manufacturer is bound to the same set of criteria when determining this limitation. Those conditions are (in no particular order):

Critical engine at idle power setting.
Critical propeller windmilling.
Operating engine producing maximum thrust.
Landing gear up (normally).
Flaps up (normally).
Aircraft loaded at the most aft allowable center of gravity.
Aircraft loaded to the maximum gross weight.
Up to five degrees of bank toward the operating engine.
Atmospheric conditions normalized to standard day at sea level pressure.

With these conditions observed, airspeed is decreased until heading cannot be maintained. That airspeed is noted, and subsequently marked by a red radial on the airspeed indicators of the production models.
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Old 06-25-2008, 11:48 PM
  #63  
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Default RE: NEW KMP 95" B-25

Oh, I should have added a link on the Minimum Contollable Airspeed, which is relevant to planes with any number of engines (0 or more).

[link=http://www.firstflight.com/flt3.html]Minimum Controllable Airspeed[/link]
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Old 06-26-2008, 12:13 AM
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Default RE: NEW KMP 95" B-25

RIP:
Just replace "MCA" with "VMC" and you are right on! I knew what you meant *
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Old 06-26-2008, 09:36 AM
  #65  
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Default RE: NEW KMP 95" B-25


ORIGINAL: lear31A

RIP:
Just replace "MCA" with "VMC" and you are right on! I knew what you meant *
Got it!

Knew the concept had a specific term, but wasn't sure about which one!

Thanks, guys,

Rip
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Old 07-03-2008, 01:30 PM
  #66  
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Default RE: NEW KMP 95" B-25

Am I missing something or is this ARF devoid of landing gear doors? Will the Wingspan Models bomb bay doors and gun turrent for the TF B-25 fit this ARF as well?
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Old 07-03-2008, 07:31 PM
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Default RE: NEW KMP 95" B-25


ORIGINAL: fancman

Am I missing something or is this ARF devoid of landing gear doors? Will the Wingspan Models bomb bay doors and gun turrent for the TF B-25 fit this ARF as well?
No doors.

I knew this before I bought it.

Ultimately, after a dozen or two flights, I'll put more customization time into her and add a working bomb bay, gear doors, a better cockpit, and maybe smoke systems for when Kahloq's ME-109 drops in behind me on a Warbirds Over the Rockies circuit!

Rip
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Old 07-03-2008, 07:55 PM
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Default RE: NEW KMP 95" B-25

Hmmm although that sounds intriguing.....my KMP ME-109 is too big scale wise to match. My smaller Kyosho Me-109 would be the right size, but its not exactly a scale looking plane. I think I would rather fly formation with you with my own B-25. However, the newer kyosho FW-190 is also the right size and it looks a ton better scale wise.
It wouldnt be a nice show to do my Kyosho ME-109 if we had the announcer with a sound box to do some gun shot effects, etc. That would be a wow and cool factor type thing for the audience
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Old 07-07-2008, 06:07 AM
  #69  
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Default RE: NEW KMP 95" B-25

Where did you get that great looking stand from. I'm looking for something like that?
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Old 07-08-2008, 04:03 PM
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Default RE: NEW KMP 95" B-25

I just ordered mine today but haven't heard anything from VQ Warbirds yet.
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Old 07-08-2008, 07:20 PM
  #71  
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Default RE: NEW KMP 95" B-25

PA757-
That is a great looking B-25! It is difficult to tell on my laptop but one of your shots looks like the main gear oleo's are facing to the rear. May want to check those if that is the case. I'm hoping to get one of these in the not to distant future so keep those photos coming.
Tim
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Old 07-09-2008, 12:38 PM
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Default RE: NEW KMP 95" B-25

Thank's!

If you see anything wrong with my build let me know! This is my first big project and want to get it right without to many mistakes. The gear is in the right place. I put it on temporarily for photos.

I'm now working on the wing Flaps. Got them set at 0 (of course) 15 and 30 degrees! Any Ideas out there on flap degrees? Here are some pic's


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Old 07-09-2008, 12:40 PM
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Default RE: NEW KMP 95" B-25

30 degrees!
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Old 07-09-2008, 12:42 PM
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Default RE: NEW KMP 95" B-25

Flaps UP!
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Old 07-09-2008, 01:51 PM
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Default RE: NEW KMP 95" B-25

Question for you guys on the KMP B25. Hows the quality. I'm very interesed in this bird, currently flying the H9 B25. I purchased the KMP Twin Otter at Joe Nall and I must say it has very poor overall quality. The fiberglass fuse is sharp looking but the manual is pathetic and flat out wrong in multiple places with references to parts that don't even exist in the kit. All the slots for stabs etc needed to be enlarged and the way the nose wheel attaches will never hold up over the long term. And, all the hardware was useless. Very disappointed in the kit and wondering if its just this kit or indicitive of all KMP kits? I could assemble three or four Aeroworks kits in the time its taking me to get this little Otter done.
Don't understand why KMP would not proof read the manual and verify its content prior to releasing the model. Again, refer to Aeroworks and their manuals for a example of a high quality manaul.
Thanks, Jerry.
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