I have planed to convert a 84" B25 eany sugetions to motor cize.
There are a few things I need to know before making any recommendations. First, you need to know how much the plane will weigh. Then you can choose the power system that includes the motor, battery, ESC and prop.
I have a 71 inch B-25 that weighs about 11.5 lbs. I use a 4S 4000mah battery, 80 amp ESC, 11 x 8.5 3-blade props and a Scorpion 4020-8 motor for each side. This gives me about 785 watts per side OR 1570 Watts total. Therefore I have about 136 watts per pound. This is the number that is very important - watts per pound. You want 100-120 watts per pound for that type of airplane.
As you can see, you can't just say "use this motor". You have to pick and choose the required pieces of equipment (motor, battery, ESC, Prop) that will give you the desired "watts per pound".
I've got eight Hacker motors, including two A50-12S and one A50-16S motors. Every one of these motors performs to their specifications. Some are on their fifth flying season, and have been absolutely trouble free.
Retired and the days are just too short, busier than ever!
I have switched to electric flying and have sold all of my glow planes. I decided to convert my Great Planes Lancair 60 to electric. Here are the specs:
Motor: OS Motor 5025 375kv 1550 Watts
ESC: Castle Creations ICE 100 AMP
Batteries: Two 4S 4200mah 35C (8S)
Prop: 14 x 7E APC (1300 Watts)
AUW: 10.4 lbs
I have not flown the plane yet but I think it will fly pretty much like the glow version. I may even be a little faster with this 125 watts/pound setup. I can go up to a 14 x 10E prop and get around 1500 watts if required.
Refurbishing an old favorite I bought in 95 from a flying buddy who built it around 1990. This is the Corby Starlet. It had a Quadra 42 that I flew for many yrs. Cleaned off half a wing panel about 5 yrs ago and it sat in the garage ever since. Converting it to electric with the same system as in the Cap 10B. I put the booster tabs on the ails and rudder to take the load off the servos. It was like putting the next sized bigger, faster servos in the plane. Going to do the same with the elevators in the overhaul. Covering material is from HK and works every bit as good as Ultracote.
Some of you may remember the giant servos we used to use back then. Pic shows the comparative size to todays standard servos that have the same or more thrust.
...I put the booster tabs on the ails and rudder to take the load off the servos. It was like putting the next sized bigger, faster servos in the plane. Going to do the same with the elevators in the overhaul...
So how do you rig that up? Does the servo only move the tab?
Hi all. Been a long, long time since i posted on here. Spotted this thread and thought I would share a couple of my conversions..
fist, a Seagull 120 size super Tucano, beautifull looking model, with all the wing stores, and a good colour scheme (Camo, brazilian air force) Started with a couple of different tornado thumper motors, but although it flew, was a mite underpowered for my liking. Now flying in a ballistic fashion with a Hacker A50 12L electric turbine motor and 6S 5000 50C battery, APC 14x10 prop. My only issue so far is trying to find a balanced spinner (82mm) that will work on the very high rpm this thing does. Junked the original servo operated retracts (1 servo for all 3 wheels!) after burning out two servos. Now using e-flite 120 size, drop straight in and work great.
Next one hasn't flown yet, although very near to finishing, that's an ASM 120" Lancaster. Using 4x Turnigy G46 670kv outrunners, 13x8 props, 4x 4cel 5500 lipo. Had to make major surgery to the fus for a battery bay, now has removable canopy. Also fitted with full sound system, moving turrets, bomb doors, and a 2 stage bomb drop for 18 bombs. Using powerbox setup for the radio (started with sm services but swapped it out), with 2x 2s lipo, plus 6s 1300 for the audio
Also done an ASM Black widow, this flies very vell, unlimited vertical, which looks crazy on an 80" plane! 2x Turnigy 5055, 2x 6s 5000, 14x8 props. Both the ASM's are fitted with robart air retracts, & lighting systems, as well as audio.
All in all, much more satisfaction doing these than just buying a big electric (though i have my share!)
Great workmanship seldom seen today. Some of the assets for going electric, as you've seen, not to worry about fuelproofing, concentrating on more scale details rather than heavy construction to handle engine vibration as well as ex. systems hanging outside the cowls. Whole different ballgame from yesteryear.
Thank you for the kind comments guys. Makes it all the more worthwhile when your work is appreciated by fellow modellers. I have some more detailed pics & video of the builds somewhere, will look them up when i get home. (Working away at the moment)
Bought the GP Escapade at a swap meet. Had a 2 stroke glow. My buddy Jason, a true Gasser guy, has been helping me convert it to a G-32. His glow version flys great. Had to add a lot of weight in the nose. Solid wood motor block. Added new cowl. Probably run on 4S or 5S. Maiden this week.- Hawk
Hope to get her out to the field this evening. When you remove the gas tank and the std size futaba throttle servo, there's ample room for just about any lipo power set-up imaginable. I could go with twin 3S 3300's on a parallel Y harness or I might just start off with a 4S 3300mah. The twin lipos would give me the weight I think I need plus the added benefit of more flight time. Need to see how it balances. Don't want to add dead weight to get it to balance, only useful weight. I have a couple of 5S 3300's 30C's coming from a buddy.
I have a 100amp esc in there. Should be more than ample for the G-32.Overkill but that's what I had laying around and I didn't think the 50amper would be enough.
I do have a few pics somewhere... I've been home since I last posted but have been so busy clean forgot to post em! I think I emailed some to a buddy, so may be able to retrieve them then post. Between me and my buddy we now have 3 ASM lancasters, and an ASM B-17, all being converted to electric. The one in the picture is the first conversion and nearest to flight, so it's also the test bed, so to speak. It has a lot of stuff to play with, all home designed, like doors, dual sets of bomb release for total of 18 bombs, lights, moving turrets etc. The second is similar but will have a lot more in the way of scale detail, like replica undercarriage, brakes, radiators, and some really nice home brewed aluminium 3blade spinners & props. 3rd will have a combination of the first two, if all goes well with the tests. The B-17 is still in the box, not had the time for that yet, but will be similar setup to the 3rd Lanc. The plan is to get a squadron of sorts and do a few shows with them in formation, although time restraints mean at least next summer at the earliest for that.
I'll look now and see what pics I have.
I have some pics & video here, mostly the early versions of things, it's all changed a bit now, but it will give you some idea. the battery bay area pics are on the pc at home, so will post later. As an explanation, the sound and radio Lipo's live in the nose, behind the front turret, and the bomb aimers bubble is hinged, with a plate behind for all the charging sockets & switches, makes for easier access. I cut a ply frame for the canopy, which is normally glued on, and magnets to attatch it, then made a tray for the flight batteries underneath. Connections are by bullets, which are on 2 'rails', pos & neg, so the batteries just plug in. The power rails are made from earthing blocks, the kind found in household electrical consumer units. Bullets are screwed into the terminals where the wire would normally go, then soldered in. There's plugs/sockets on the other side going back too, to the trailing power wires from the wings plug into the other side. I cant post video directly here, so will upload to Utube later then post the links.