Notices
Twin & Multi Engine RC Aircraft Discuss the ins & outs of building & flying multi engine rc aircraft here.

NEW KMP 95" B-25

Old 07-17-2017, 07:50 AM
  #1476  
Katniss
 
Katniss's Avatar
 
Join Date: Nov 2013
Location: Colorado
Posts: 270
Received 3 Likes on 3 Posts
Default

You would have to show pictures because several years ago, KMP sold a B25 that was only 83" wingspan. It was still manufacturered by ESM. However, ESM made a newer B25 about 6 years ago and is the current offering that is much larger at 95". ESM changed KMPs distribution ability, and switched over to Troybuiltmodels, as well as VQwarbirds. Now, as far as I know, VQ is the only one carrying it in the US
Old 07-17-2017, 07:53 AM
  #1477  
jseese
 
Join Date: May 2014
Posts: 13
Likes: 0
Received 0 Likes on 0 Posts
Default

I am using power 110's on 8s, 5000mah per side, 16x10 MAS props. 32 pounds and it flies scale at 75% throttle. I fly for 6-7 minutes and have plenty of reserve left. Great flying plane I just need a better way to charge in the plane or to get to the batteries. I have them mounted in the nacelles and have to flip the plane to get them out.

Jon
Old 07-17-2017, 07:55 AM
  #1478  
jseese
 
Join Date: May 2014
Posts: 13
Likes: 0
Received 0 Likes on 0 Posts
Default

For those doing electrics where are you guys putting your batteries? Just curious from what I am doing. Thanks!

Jon

Last edited by jseese; 07-18-2017 at 01:22 PM.
Old 07-17-2017, 08:44 AM
  #1479  
rdperformance
My Feedback: (3)
 
Join Date: Sep 2011
Location: Toms River, NJ
Posts: 8
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by Katniss
You would have to show pictures because several years ago, KMP sold a B25 that was only 83" wingspan. It was still manufacturered by ESM. However, ESM made a newer B25 about 6 years ago and is the current offering that is much larger at 95". ESM changed KMPs distribution ability, and switched over to Troybuiltmodels, as well as VQwarbirds. Now, as far as I know, VQ is the only one carrying it in the US
This only 2 years old I am told and it is 96" WS
Old 07-17-2017, 09:31 AM
  #1480  
Eldher
 
Join Date: Nov 2005
Location: fort collins, CO
Posts: 448
Likes: 0
Received 0 Likes on 0 Posts
Default

Original post by rdperformance:
"Is there any difference in the KMP and the ESM B 25, seems very similar or the same plane. I just acquired one built with servos but never completed or flown. I am not really into twins and can make someone a good deal if interested.
Thanks Rich"

KMP released 2 B-25's. They had one for several years which was smaller than the current ESM. Then about 6 years ago, KMP released a larger B-25, but kitted by ESM. They had it for about 1 year, when Troy Built took over the ESM line.

Bottom line, if you have a KMP B-25 with a 95" wingspan, then you have the ESM version, and it is the same as what is sold today.
ONE IMPORTANT POINT - the very first batch of these KMP/ESM B-25s had wingtip sections that drooped down several degrees. While not impacting flight performance, it was obvious when assembled and there was a huge outcry, and KMP got it fixed. If you have a KMP version, you could have a droop wing version. If you dry fit the wing section parts together, and look head on at the leading edge, you will be able to tell if you have this problem.

Last edited by Eldher; 07-17-2017 at 09:37 AM. Reason: added original post
Old 07-17-2017, 08:11 PM
  #1481  
tevans55
 
Join Date: Aug 2007
Location: Louisville, KY
Posts: 1,337
Received 6 Likes on 6 Posts
Default

I have droopy wings on my Doolitlle B-25. Tomas at VQ Warbirds got me a new set of wings from ESM after a 3.5 year wait. Troybuilt could not get wings for me but when VQ Warbirds took over as the new importer I had new wings in less than 6 months.
Old 07-18-2017, 06:00 AM
  #1482  
Eldher
 
Join Date: Nov 2005
Location: fort collins, CO
Posts: 448
Likes: 0
Received 0 Likes on 0 Posts
Wink

Originally Posted by tevans55
https://youtu.be/zhw-_Xq9dvk
I have droopy wings on my Doolitlle B-25. Tomas at VQ Warbirds got me a new set of wings from ESM after a 3.5 year wait. Troybuilt could not get wings for me but when VQ Warbirds took over as the new importer I had new wings in less than 6 months.
Nothing like a new pair of wings!
Old 07-18-2017, 06:00 AM
  #1483  
Eldher
 
Join Date: Nov 2005
Location: fort collins, CO
Posts: 448
Likes: 0
Received 0 Likes on 0 Posts
Wink

Originally Posted by tevans55
https://youtu.be/zhw-_Xq9dvk
I have droopy wings on my Doolitlle B-25. Tomas at VQ Warbirds got me a new set of wings from ESM after a 3.5 year wait. Troybuilt could not get wings for me but when VQ Warbirds took over as the new importer I had new wings in less than 6 months.
Nothing like a new pair of wings!

Nice bird, thanks for sharing.
Old 07-18-2017, 12:45 PM
  #1484  
tevans55
 
Join Date: Aug 2007
Location: Louisville, KY
Posts: 1,337
Received 6 Likes on 6 Posts
Default

Thanks
Old 07-18-2017, 01:24 PM
  #1485  
jseese
 
Join Date: May 2014
Posts: 13
Likes: 0
Received 0 Likes on 0 Posts
Default

Nice bird Tevan, she really moves!!

Here are some pics of mine in various stages:
Old 07-18-2017, 05:29 PM
  #1486  
tevans55
 
Join Date: Aug 2007
Location: Louisville, KY
Posts: 1,337
Received 6 Likes on 6 Posts
Default

Jseese that is beautiful. Does it fly well?
Old 07-19-2017, 07:42 AM
  #1487  
jseese
 
Join Date: May 2014
Posts: 13
Likes: 0
Received 0 Likes on 0 Posts
Default

It does fly great, I have been flying it quite a bit this summer. My friend has an electric Ziroli and we have been flying formations and at some events we have had as many as four flying together. Has been a great flying season. The only issue is I wish I didn't have to flip the plane to swap out batteries
Old 07-19-2017, 09:01 AM
  #1488  
Eldher
 
Join Date: Nov 2005
Location: fort collins, CO
Posts: 448
Likes: 0
Received 0 Likes on 0 Posts
Talking

Originally Posted by jseese
It does fly great, I have been flying it quite a bit this summer. My friend has an electric Ziroli and we have been flying formations and at some events we have had as many as four flying together. Has been a great flying season. The only issue is I wish I didn't have to flip the plane to swap out batteries
Oh yah, this plane is a beast. Flipping her over is not fun. :-)
Old 07-19-2017, 05:51 PM
  #1489  
tevans55
 
Join Date: Aug 2007
Location: Louisville, KY
Posts: 1,337
Received 6 Likes on 6 Posts
Default

jseese
When I first built my plane I put (4) 3500 mAh nicd batteries in the space above the nose gear. You could cut a hatch in the area between the canopy and nose turret to access that area for batteries. It is a fairly large space. Just a thought. I had considered doing that for my plane but realized I could just drop my batteries in that space before I installed my nose gear. I now use (2) electrodynamics A123 batteries which I have installed in the nose gear wheel well.
Old 07-20-2017, 09:22 AM
  #1490  
jseese
 
Join Date: May 2014
Posts: 13
Likes: 0
Received 0 Likes on 0 Posts
Default

I never thought about the nose area. The issue I may run into is the full depth cockpit I have in that area now and in the nose I have my 2 LIFE receiver batteries and a small lipo for my electric retracts. But you may be onto something there. I will have to do some investigating after the season is over.

Thanks!!
Old 07-20-2017, 09:25 AM
  #1491  
jseese
 
Join Date: May 2014
Posts: 13
Likes: 0
Received 0 Likes on 0 Posts
Default

The other thing I have to consider is the long runs on wires between ESC/MOTOR/BATTERY. They are all short runs in the nacelles so if I put the batteries in the fuse I will need to figure out ESC placement. Is it better to have longer runs between ESC and motor or battery to ESC?
Old 07-20-2017, 12:01 PM
  #1492  
Katniss
 
Katniss's Avatar
 
Join Date: Nov 2013
Location: Colorado
Posts: 270
Received 3 Likes on 3 Posts
Default

What's wrong with slinging the batteries under the main center wing section in the "bomb bay"? Wouldn't even need to flip the plane over.
Old 07-20-2017, 12:33 PM
  #1493  
jseese
 
Join Date: May 2014
Posts: 13
Likes: 0
Received 0 Likes on 0 Posts
Default

Using 4 5000mah batteries (2 on each side) the plane balances with very little dead weight with them in the front of the nacelles so if they are in in the bomb bay area the plane would be very tail heavy unless you offset the nose with a bunch of lead.Not saying that wouldn't be an option, I just might have to stack them 2 high and put them as far forward as I can.

Thanks!!

Old 07-20-2017, 01:28 PM
  #1494  
Katniss
 
Katniss's Avatar
 
Join Date: Nov 2013
Location: Colorado
Posts: 270
Received 3 Likes on 3 Posts
Default

Mine already has a bunch of lead in the nose... It was built and balanced with saito 170 radials...
but I could never get them synced up even with a twinsync. It just wasn't reliable. So for me, since I already have a full forward greenhouse, batteries would need to go in cowls or bomb bay
Old 07-21-2017, 06:19 AM
  #1495  
Eldher
 
Join Date: Nov 2005
Location: fort collins, CO
Posts: 448
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by jseese
The other thing I have to consider is the long runs on wires between ESC/MOTOR/BATTERY. They are all short runs in the nacelles so if I put the batteries in the fuse I will need to figure out ESC placement. Is it better to have longer runs between ESC and motor or battery to ESC?
Extend the wires from the battery to the ESC. Keep the ESC to motor connections in the default size. You also only have 2 wires on each side to extend by doing the battery side. I would also think it is easier to keep the ESC cool in the nacelle side.
Old 07-23-2017, 10:20 PM
  #1496  
WStones
 
WStones's Avatar
 
Join Date: Feb 2017
Location: Mitchelton Queensland
Posts: 14
Likes: 0
Received 0 Likes on 0 Posts
Default

Hi Guys, I am mounting my batteries in the nose above the nose gear. I am making the whole nose removable and held on with magnets to ease the removal of the batteries. Yes you are correct about the wiring for the esc's. I am mounting mine behind the motors in the cowling area for maximum air flow, and using long esc to battery leads of large gauge wire. I am going to run power 90's in mine. I just ran all the wiring and air lines for my retracts the other day. I will get some photos later. Enjoy, and great to see this forum active again!
Old 07-27-2017, 02:58 AM
  #1497  
rdperformance
My Feedback: (3)
 
Join Date: Sep 2011
Location: Toms River, NJ
Posts: 8
Likes: 0
Received 0 Likes on 0 Posts
Default

I have one of these for sale if ay body is interested. was completed but never flown so I am told. Presently has servos only. B/O Tried to download photos no luck. Will email same if interested.

Rich
Old 10-08-2017, 05:19 PM
  #1498  
raron455
My Feedback: (38)
 
raron455's Avatar
 
Join Date: Sep 2012
Location: Waco TX
Posts: 1,129
Received 12 Likes on 10 Posts
Default Help with Engine selection

Allright Fellas, I bought mine earlier this year, and am starting to mess with it. I was not sure what engines to go with, some guys said DLE-20RA was plenty. SO, I bought a brand new DLE-20RA put a Bowman Ring in it, smoothed and flattened the reed block. and put it in a hangar 9 corsair 60 as a test bed for the engines before putting it in my B25. I have about 16 flights on the little engine now, and it runs like a top, great idle never misses and easy starts. My RPM numbers are this,
On a 2 blade XOAR 16x8 WW2 prop I got about 7500 RPMS
On a 3 Blade master Airscrew I was turning 8200 RPMS however it has a noticeable slower spool up to full RPM than the 2 blade prop
I guess these RPM numbers are good? Don't know about thrust.
The one thing I know for sure Is I will be putting 3 blade props on this plane. HOWEVER, I am curious as to the power the 20RAs provide, I do not want a plane that has "just enough " power. Can the 20s do the job effectively? I am stuck right now on whether or not to buy another 20 RA, or move up to the DLE-35RA which I know has a ton of power, and not much heavier than the 20, but can spin a larger heavier prop. I would appreciate any help from you guys as I am really stuck in making my mind up right now. I have searched, and there are a few videos of this plane with the DLE 20s and in the videos they seem to have a really LONG rollout.
any help advice would be appreciated, thanks fellas
Ronnie
Old 10-09-2017, 04:30 AM
  #1499  
John8861
My Feedback: (2)
 
Join Date: Aug 2003
Location: Plainfield, IL
Posts: 100
Received 5 Likes on 5 Posts
Default

Hi Ronnie,

I have OS 120 4 strokes in mine 8700 rpm with the 3 blade prop you spoke of. The plane is a rocket ship. The sound is amazing with the reliability of OS. I finished the model in 2010 and been flying it ever since. It’s a real croud pleaser and one of my favorite planes. I do have a guy in my club put Zenoah G 26’s in his and it has too much power. I would stay away from the 35’s. Seriously consider the OS 120’s you will not be disappointed.

John
Old 10-09-2017, 06:28 AM
  #1500  
Eldher
 
Join Date: Nov 2005
Location: fort collins, CO
Posts: 448
Likes: 0
Received 0 Likes on 0 Posts
Default

Ronnie,

Turning a 16x8x3 at 8200 RPM will be good power. The only thing to take into account is if you travel to shows with the plane. At altitude, the DLE's will be weak. I fly in Denver. Two of us have the plane with Saito 180 class engines. We turn the same prop at 8800 RPM here at 5000'.

One other thing I agree completely with John, get a 4-stroke. The sound is killer. My friend here has the gas version of the Saito 180 (FG-30). It's perfect.

Chris

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service -

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.