ESM P-39
02-28-2011, 12:26 PM
#26
Senior Member
My Feedback: (-1)
Join Date: Mar 2010
Location: Bad Lippspringe, 1944, GERMANY
Posts: 2,658
Likes: 0
Received 0 Likes
on
0 Posts
RE: ESM P-39
If I was doing this plane it would either be:
1. HellsBELLS from 67thFS/347thFG operating out of Guadalcanal, 1942
or
2. DEVASTATING DEVIL 49thFS/15thFG operating out of Canton Island, 1943
1. HellsBELLS from 67thFS/347thFG operating out of Guadalcanal, 1942
or
2. DEVASTATING DEVIL 49thFS/15thFG operating out of Canton Island, 1943
03-09-2011, 11:10 AM
#28
Senior Member
Join Date: Jul 2007
Location: San Jose,
CA
Posts: 2,060
Likes: 0
Received 0 Likes
on
0 Posts
RE: ESM P-39
Got mine yesterday 
I also got the gear too. Looks like they did a good job on the gear. The nose gear is spring loaded to it self centers. Came with nice wheels too. Also, they are now shipping the better air line so no more leaks
Can't start on this until I get my P-47 finished. Almost ready to pain.
Jeff
I also got the gear too. Looks like they did a good job on the gear. The nose gear is spring loaded to it self centers. Came with nice wheels too. Also, they are now shipping the better air line so no more leaks
Can't start on this until I get my P-47 finished. Almost ready to pain.
Jeff
03-10-2011, 07:29 PM
#29
My Feedback: (27)
RE: ESM P-39
Ty, any possibility of doing a partial cockpit and maybe drop the cockpit floor just enough to get a bust in there, do the seat back and radio, gunsight. I would like to try to avoid relocating the servo setup. Speaking of that, not much room or access to install the pull pull for the elevator or rudder. May go with a carbon f rod for the elevator. Got the eflite 160 and probably do a 10s setup. The kit looks beautiful by the way. Trying SO hard to buikld and fly and aviod the scheme changing thingy I always trap myself into. Waiting to hear about the sierra gear also because I think the esm nose gear does not have enough of a forward rake as the full scale does. Very characteristic look for the P-39.
03-10-2011, 11:37 PM
#30
RE: ESM P-39
The carbon rod is the best thing to do.. I have never liked the idea of the pull pull on the elevator.. Several have failed on the ESM planes.. I am getting ready to start on the cockpit and will always have parts available for a partial cockpit.. But I think that I will be able to save the back part of the servo tray . With this plane you should not have to cut a hatch for the Lipo's. There is plenty of room in the forward gear openingPost some pic's when I get started this weekend...
Ty
Ty
03-22-2011, 07:04 PM
#37
Join Date: Sep 2002
Location: Missoula,
MT
Posts: 307
Likes: 0
Received 0 Likes
on
0 Posts
RE: ESM P-39
Hey guys
I am new to electrics, but would like to get this plane and make it electric. What motor are you going to use, and what size batteries? That plane just would not look right with a cylinder head sticking out.
Thanks
Ron
I am new to electrics, but would like to get this plane and make it electric. What motor are you going to use, and what size batteries? That plane just would not look right with a cylinder head sticking out.
Thanks
Ron
03-22-2011, 10:37 PM
#38
RE: ESM P-39
Manfred,
I have the dash, seat and main cockpit body done. I am starting on the resin parts now. I normally would have this just about ready to ship. I had a Death in the Family last week and missed about 5 days of working in the shop. ( It was not unexpected). I just had to make all arrangements related to the funeral. I just got back to work om it yesterday...
Hope to post pic's soon...
Ty
I have the dash, seat and main cockpit body done. I am starting on the resin parts now. I normally would have this just about ready to ship. I had a Death in the Family last week and missed about 5 days of working in the shop. ( It was not unexpected). I just had to make all arrangements related to the funeral. I just got back to work om it yesterday...
Hope to post pic's soon...
Ty
03-23-2011, 04:05 AM
#39
RE: ESM P-39
Drape:
I did a study on this, as I already have a Wing P-39 (1/7.5 scale) that's electric powered and it has been everything I hoped for.
I would use a Rimfire 160 63-62-250 (Tower stock #LXLWW1) with a Castle 85 high voltage ESC, and 2 5000 6S packs in series. The Great Planes info on this combination indicates it will turn a 18x8E prop at 6969 RPM, using 66A. (53mph and 27# thrust) This is the surge rating, with constant allowable amperage at 45. (Maximum surge rating is 72A) I've found, with three different Rimfire motor setups, that Great Plane's performance specs are right on the money, and sometimes a bit on the conservative side.
If I did it, I'd experiment with some three blade props. I'm sure there's one that will work well with this setup, and make the bird look a lot more scale. All that thrust is not needed, and a little more airspeed would be nice. Maybe the 16x10 MAS 3 blade?
I added up the weight of the various components for both gasoline and electric (including the weight of the tank and fuel) and the electric version will weigh roughly 10oz more than the 40cc Evolution gas one. This is with a 2000 4 cell NiMh pack for the Rx.
I'm sure it will fly ok, but with retracts it is going to be on the heavy side- probably between 19 and 20 pounds. This will put the wing loading north of 35 oz per square foot. Not bad for a big warbird, but you'll definitely want to pay attention to your airspeed. At full throttle on the 18x8 prop, you'll have enough thrust to pull stumps, so it should be fun.
I've played around a lot with electric performance and weight specs, using the Great Planes calculators and actual testing, and I have some general conclusions about converting glow to electric:
1. On single engine planes, there is usually a significant weight savings up to about 46 - 50 size. The performance is on par or better than glow. Once you get past that size, tho, the bigger batteries required for the larger motors swing the scale the other way, and things get heavier. The performance, tho, is very good, often much better than gas or glow, and the electric motor is a snap to fit inside the cowling. When I did my Wing 'cobra, it came out at least 1/4 pound lighter than the glow version. In addition to electric power, I used thinner balsa in many areas, as the lack of vibration makes this practical.
2. Big, multi engined birds are best done with electric. The weight savings is significant, for example, a Wing Mfg B-17 with 4 geared Ammo inrunners will weigh at least 23 oz less than the glow version using OS 25AX engines. This is mostly due to the weight of all those engines, as the glow fuel and the batteries for the electrics weigh about the same.
I did a study on this, as I already have a Wing P-39 (1/7.5 scale) that's electric powered and it has been everything I hoped for.
I would use a Rimfire 160 63-62-250 (Tower stock #LXLWW1) with a Castle 85 high voltage ESC, and 2 5000 6S packs in series. The Great Planes info on this combination indicates it will turn a 18x8E prop at 6969 RPM, using 66A. (53mph and 27# thrust) This is the surge rating, with constant allowable amperage at 45. (Maximum surge rating is 72A) I've found, with three different Rimfire motor setups, that Great Plane's performance specs are right on the money, and sometimes a bit on the conservative side.
If I did it, I'd experiment with some three blade props. I'm sure there's one that will work well with this setup, and make the bird look a lot more scale. All that thrust is not needed, and a little more airspeed would be nice. Maybe the 16x10 MAS 3 blade?
I added up the weight of the various components for both gasoline and electric (including the weight of the tank and fuel) and the electric version will weigh roughly 10oz more than the 40cc Evolution gas one. This is with a 2000 4 cell NiMh pack for the Rx.
I'm sure it will fly ok, but with retracts it is going to be on the heavy side- probably between 19 and 20 pounds. This will put the wing loading north of 35 oz per square foot. Not bad for a big warbird, but you'll definitely want to pay attention to your airspeed. At full throttle on the 18x8 prop, you'll have enough thrust to pull stumps, so it should be fun.
I've played around a lot with electric performance and weight specs, using the Great Planes calculators and actual testing, and I have some general conclusions about converting glow to electric:
1. On single engine planes, there is usually a significant weight savings up to about 46 - 50 size. The performance is on par or better than glow. Once you get past that size, tho, the bigger batteries required for the larger motors swing the scale the other way, and things get heavier. The performance, tho, is very good, often much better than gas or glow, and the electric motor is a snap to fit inside the cowling. When I did my Wing 'cobra, it came out at least 1/4 pound lighter than the glow version. In addition to electric power, I used thinner balsa in many areas, as the lack of vibration makes this practical.
2. Big, multi engined birds are best done with electric. The weight savings is significant, for example, a Wing Mfg B-17 with 4 geared Ammo inrunners will weigh at least 23 oz less than the glow version using OS 25AX engines. This is mostly due to the weight of all those engines, as the glow fuel and the batteries for the electrics weigh about the same.
03-27-2011, 07:48 AM
#44
My Feedback: (27)
RE: ESM P-39
Looks great Ty, will you be including the detail panels and radio for the rear section. Also, check out this sim http://allaircraftsimulations.com/fo...=15260&start=0
03-27-2011, 10:10 AM
#45
RE: ESM P-39
I am really debating about that. If you look at all the post war pic's of the Brooklyn bum there are no Radio Boxes in the rear. I think it was really according to the unit or model that determined what was behind the pilot. The same simulation that you linked to also has an amour plating. The boxes are really hard to pull and get them to look good...
04-03-2011, 12:03 PM
#49
RE: ESM P-39
I spoke with Darrell a few days ago. He said he is definitely doing gear for the P-39. He already has the design complete. He said they will be ready in approximately one month, two at the latest. As a side note, he alreay has the plane and is planning on going electric with it.