All composite fiberglass American Eagle B17 126in
08-11-2015, 06:33 AM
#1
All composite fiberglass American Eagle B17 126in
Hey guys I cant belive I took on this project but im excited non the less.
So there was a guy selling this All molded B17 project with in a 2 hour drive from my place at a price I could not resist, did not know the manufactor or anything. Well I posted a picture on facebook, and a nice guy got on and said this was 1 of 3 all composite B17 made off of American Eagle B17 that were supposed to be used in a movie or something, Cool, but I was told it was bigger as the seller said it was the same size as the wingspan 1/9 B17.
I was orginaly plainning on going with DLE20RA for relieablity and power as I think this one is a little heavy with the all modled on tail etc, but now that I found out its smaller, I feel like my options are less, I cant stand the sound of any of the smaller 2 stroke gassers, and 4 .82 Satio Gassers at $360 each are out of my $$ range on this one. And to be honest Im not the best with tuneing. I do currently have a ESM B25 with 2 ASP 1.80 4c converted to gas with 15X8X3 mas Props and twin syinc controler.
I have been strugleing with power set up for this bird, I have seen pictures of this thing flying with .61 2c to .91 4 Satios, but I think mine will be a little heaver, I see the avarge weight is 42-50 pounds but again, the orginal American Eagle B17 is a foam wing based.... So I have been looking for power set ups for a 14X7X3 MAS prop.
I was told if I converted to electric I would want around 150 watts per pound, and was recomened to use the new Power 60 at 470kv or Rimfire .80 at 500kv on big 6000mah 6s lipos. As it looks like I will need a bunch of nose weight, the lipos make sence, and with 4 motors the electric option is a safer bet, and will make it were I will fly this big bird more often.
But I once had a Hanger 9 B25 with Power 46. set up and I got carried away with the sound system and had 4 speakers on board and still could not hear it in the air well. LOL
So one of my boys suggested something crazy, what about a hi bread? Put electic motors on the out side pods, and 2 4c on the inside pods, that way I can still get some good 4c sound with out all the head ach of trying to get 4 motors to run the same. Pluse with electic motors on the out side, if one of the 4c flame out, it should couse no issues, and I can use the electric motors with some diferantal to help the rudder on the ground. Im sure I can make it work with my DX18.
What you guys think for power set ups?
So there was a guy selling this All molded B17 project with in a 2 hour drive from my place at a price I could not resist, did not know the manufactor or anything. Well I posted a picture on facebook, and a nice guy got on and said this was 1 of 3 all composite B17 made off of American Eagle B17 that were supposed to be used in a movie or something, Cool, but I was told it was bigger as the seller said it was the same size as the wingspan 1/9 B17.
I was orginaly plainning on going with DLE20RA for relieablity and power as I think this one is a little heavy with the all modled on tail etc, but now that I found out its smaller, I feel like my options are less, I cant stand the sound of any of the smaller 2 stroke gassers, and 4 .82 Satio Gassers at $360 each are out of my $$ range on this one. And to be honest Im not the best with tuneing. I do currently have a ESM B25 with 2 ASP 1.80 4c converted to gas with 15X8X3 mas Props and twin syinc controler.
I have been strugleing with power set up for this bird, I have seen pictures of this thing flying with .61 2c to .91 4 Satios, but I think mine will be a little heaver, I see the avarge weight is 42-50 pounds but again, the orginal American Eagle B17 is a foam wing based.... So I have been looking for power set ups for a 14X7X3 MAS prop.
I was told if I converted to electric I would want around 150 watts per pound, and was recomened to use the new Power 60 at 470kv or Rimfire .80 at 500kv on big 6000mah 6s lipos. As it looks like I will need a bunch of nose weight, the lipos make sence, and with 4 motors the electric option is a safer bet, and will make it were I will fly this big bird more often.
But I once had a Hanger 9 B25 with Power 46. set up and I got carried away with the sound system and had 4 speakers on board and still could not hear it in the air well. LOL
So one of my boys suggested something crazy, what about a hi bread? Put electic motors on the out side pods, and 2 4c on the inside pods, that way I can still get some good 4c sound with out all the head ach of trying to get 4 motors to run the same. Pluse with electic motors on the out side, if one of the 4c flame out, it should couse no issues, and I can use the electric motors with some diferantal to help the rudder on the ground. Im sure I can make it work with my DX18.
What you guys think for power set ups?
08-18-2015, 08:30 AM
#3
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Four Saito 100s would fly this plane all day long. I have seen two large B-17s that were electric, and while reliable and looked great with not exhausts or heads hanging out...they lacked noise and personality. It takes away from the soul of a B-17 to not have real internal combustion noises, smoke and some oil.
08-20-2015, 08:31 AM
#5
Four Saito 100s would fly this plane all day long. I have seen two large B-17s that were electric, and while reliable and looked great with not exhausts or heads hanging out...they lacked noise and personality. It takes away from the soul of a B-17 to not have real internal combustion noises, smoke and some oil.
I just ordered a MAS 13X8X3 and 14X9X3 props and a new motor to see wich combo I like the most. I already have a 400kv Power .60 motor but I think its kv may be a tad low so I order 430kv motor. My goal is to keep the amp draw as low as possable as there are 4 motors here. With the crazy advent of these quad copters (that I cant stand) there are companys now putting out 16,000. to 20,000 mah 6s lipos. It would be nice to use just one lipo pack per flight, save on wireing and other issues.
Ill keep you updated once the amp meter and motor show up for testing.
I am going to install a speaker set up, Im not sure whos to go with, I want to try to get some sweet start up and shut down sound. Any companys you recomend?
Thanks Mike
08-20-2015, 09:17 AM
#6
You could get around cutting the wing for fuel tanks if you make removable firewalls. You could also recess the firewall to give you more room. Of course if you are allergic to alcohol fuels, then electric is your only choice. A guy in the club runs the OS 91 gas two stroke and it has a great sound. It almost sounds like a bigger engine running on a cannister set up. Very quiet with a nice tone to it. Not cheap, but his does run really nice...
I had some of those giant lipos at the house that belonged to a customer. Literally a brick sized Lipo. I was not all that fond of keeping those big suckers in my garage.
Be careful with those MAS three blades. I have seen them throw blades while never have a ground strike or any other damage. I had a few that center holes were WAY off center too.
I had some of those giant lipos at the house that belonged to a customer. Literally a brick sized Lipo. I was not all that fond of keeping those big suckers in my garage.
Be careful with those MAS three blades. I have seen them throw blades while never have a ground strike or any other damage. I had a few that center holes were WAY off center too.
08-20-2015, 03:15 PM
#7
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Location: Elephant Butte, N.M.
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I have a Wescraft 125" B-17, that is on the back burner for a while, but I am going to use electric motors in it. Planning to use Turnigy 4250 650Kv motors turning 14x9x3 MAS props on 4s. Expected weight is about 37-40lbs.
They will turn those props at 6800 rpm while drawing 56 amps. That equates to a pitch speed of 58mph and 7lbs of thrust per motor for a total of 28lbs. I have seen several of these fly at Bomber Field, on .40s, and .46 glow motors, so should be a good setup.
Mr R/c sound has good sound system, and has a multi-engine chip available. That, with his amp, and 4 transducers should create a "beautiful noise".
They will turn those props at 6800 rpm while drawing 56 amps. That equates to a pitch speed of 58mph and 7lbs of thrust per motor for a total of 28lbs. I have seen several of these fly at Bomber Field, on .40s, and .46 glow motors, so should be a good setup.
Mr R/c sound has good sound system, and has a multi-engine chip available. That, with his amp, and 4 transducers should create a "beautiful noise".
08-24-2015, 05:17 PM
#8
Ok so according to the pich speed calculator I use it says your 14x9x3 prop at 6800rpm is 6.87 pounds thrust and a 50mph flying speed
So I just tested my HK 430kv 5055 motor.
13x8x3 MAS prop 6s 8000rpm 32 amps 700watts at 3.08v per cell 7 pounds of thrust and 52mph flying speed
14x9x3 MAS 6s 7600rpm 42 amps at 1000 watts at 3.08v per cell 8.5 pounds of thrust and 56mph flying speed
What you think
So I just tested my HK 430kv 5055 motor.
13x8x3 MAS prop 6s 8000rpm 32 amps 700watts at 3.08v per cell 7 pounds of thrust and 52mph flying speed
14x9x3 MAS 6s 7600rpm 42 amps at 1000 watts at 3.08v per cell 8.5 pounds of thrust and 56mph flying speed
What you think
