Official FMS 1500mm P-47D Razorback Thread

[Eagle15]

Quick question

I tried running up my p47 to full power for a few seconds (3-4). It felt great, power was amazing; this was with the Corsair prop. I started smelling something weird and checked the plane and there was smoke coming out of the front. I unplugged the battery, tried taking off the propeller. The prop wouldn’t budge- it was almost melted into the propeller shaft and was burning hot. I took a wrench and managed to take off the propeller, and the shaft along with the exterior of the electric motor was extremely hot.

Did I do something wrong? Is the big prop too much for the stock esc? Or is my plane a defect?

thankfully the rest of my plane is fine. Room smells terrible tho; a kind of burning acid smell.

[davegee]

Hi Eagle15: very sorry to hear about that! I have been running the Corsair prop on my three (soon to be four) GB FMS P-47s. I have many flights on all of them with the big prop but have never encountered a problem with any of them. Is it possible you had a defective motor, or something? Maybe someone else on Hobbysquawk who might have some ideas. I just flew one my P-47s the other day after a 6 month layoff for winter. I got three uneventful flights with it. Seems very odd, to me.

i hope you find a solution soon to this problem. Please post if you find the cause.

Regards,

Davegee

[chabd]

Just finished some scale added touches to the Dave Schilling pilot figure for the Hairless Joe aircraft I am working on. Dan did his usual masterful job painting the 3D pilot, and I added a few things like communications wiring like they used in US fighter aircraft in WWII. The black wire off to the side represents the plug in for mask mic and headphones into a receptacle on the left side of the cockpit.

He is sitting in a scale P-47 pilot seat that is 3D printed, not painted yet. I posed him wearing the oxygen mask that I resized and printed hanging down off to the side as is seen in several photos of him on the ground. I even added Lt. Col. silver oak leaves to his A-2 jacket epaulets. He was promoted to full Col. on October 1, 1944.

Once I get the bubble canopy from James who sent it to a company to use his molds for the canopy/windscreen, I'll get going on possibly powering the canopy with a small linear servo. Space is very tight, so that is an issue, among others, to do this.

Cheers

Davegee

That's amazing work. But he's not very happy. Is because he's watching 'the one that got away', get away?

[F106DeltaDart]

Quick question

I tried running up my p47 to full power for a few seconds (3-4). It felt great, power was amazing; this was with the Corsair prop. I started smelling something weird and checked the plane and there was smoke coming out of the front. I unplugged the battery, tried taking off the propeller. The prop wouldn’t budge- it was almost melted into the propeller shaft and was burning hot. I took a wrench and managed to take off the propeller, and the shaft along with the exterior of the electric motor was extremely hot.

Did I do something wrong? Is the big prop too much for the stock esc? Or is my plane a defect?

thankfully the rest of my plane is fine. Room smells terrible tho; a kind of burning acid smell.

I think the issue is more due to doing a static full throttle runups like that. In flight, the prop unloads a lot, particularly large diameter scale multiblade props. For example, you might see a peak of ~70A in flight at full throttle as the aircraft is accelerating or in a vertical climb. However static, that might be more like 110A. That's a good way to cook the motor and ESC if they aren't sized for that load.

[davegee]

That's amazing work. But he's not very happy. Is because he's watching 'the one that got away', get away?

Yeah, he looks pretty intense, maybe that one that got away made him mad. But he got his share in WWII, about 22.5 air kills including 5 in one dogfight flying this aircraft, and 11 or more ground kills. He also pioneered air to air refueling in fighter jets after the war, flying nonstop over the Atlantic and Pacific Oceans with aerial refueling tankers. Sadly, he passed away at age 37 in a solo car crash accident in England in 1956.

[Eagle15]

I think the issue is more due to doing a static full throttle runups like that. In flight, the prop unloads a lot, particularly large diameter scale multiblade props. For example, you might see a peak of ~70A in flight at full throttle as the aircraft is accelerating or in a vertical climb. However static, that might be more like 110A. That's a good way to cook the motor and ESC if they aren't sized for that load.

Makes sense. Yeah I probably won’t be doing any more power tests . . . Another thing that I found is that the propeller wasn’t securely attached to the shaft… it still spun but I think not the same speed as the shaft. The friction probably caused the overheat and smoke.

thankfully it should be good now, I’ll try running it up to 20% power today and make sure it’s fine. Hopefully I don’t burn the house down!

[davegee]

Makes sense. Yeah I probably won’t be doing any more power tests . . . Another thing that I found is that the propeller wasn’t securely attached to the shaft… it still spun but I think not the same speed as the shaft. The friction probably caused the overheat and smoke.

thankfully it should be good now, I’ll try running it up to 20% power today and make sure it’s fine. Hopefully I don’t burn the house down!

Sounds good. You can always try any tests Outside!!😁😁😁

I have done a few full power tests that were just momentary runups and then back down again. For flying, remember that it is easier to get a prop strike on takeoff or landing if you get the nose too low during those times. Once you get used to the new prop, you can adjust a bit to avoid that.

Cheers

Davegee

[davegee]

Hi All: I am working on a DYI servo-powered ratchet device to open and close the canopy on my P-47. I found something on Thingiverse and printed it up. It works ok in that it moves about 1/2 inch travel, but I need to get close to 2 inches of travel back and forth.

Is there some setting on my DX18 transmitter to get the throw longer each way approaching a 2 inch throw?

Thanks for any ideas or help on this! I think if I can get the throw long enough, I can figure out getting this canopy to open realistically, I hope!

Cheers

Davegee

[jetfool]

Davegee,
If your radio can't get the correct throw, you might try a fulcrum between servo and canopy to get the correct movement. A strip of 1/16 g-10 or 1/16" alum. by 1/4" wide would give enough strength. My .02 cents.
Looking forward to this.
Best Regards, Rex

[davegee]

Davegee,
If your radio can't get the correct throw, you might try a fulcrum between servo and canopy to get the correct movement. A strip of 1/16 g-10 or 1/16" alum. by 1/4" wide would give enough strength. My .02 cents.
Looking forward to this.
Best Regards, Rex

Hi Rex: thanks, that might be a way to go. I'll attach a pic of the completed printed parts. The moving part works ok on the teeth of the servo, it's just the movement of that piece is only about 1/2 inch before the servo is maxed out in direction each way. If that servo could continuously move, I could get the amount of travel I am looking for. That would be great if I can figure that out somehow. I have ordered an inexpensive continuous movement servo to experiment with. My concerns are that I don't think it has or can put stop limits on it so it might be under load at each physical stop, held there mechanically and then overheat and burn out.

There is one other idea I am considering is a Canadian outfit that makes all sorts of linear servos for industrial uses, some very small that would be what I am looking for. They're gone through Monday for the Easter holiday, but I hope to call them up next week and see if they can recommend one that would work for me.

Are you in Toledo right now? Howz things looking for this year's show?? Please give us are report sometime if you have the time, or after the show is over.

Good Luck!

Dave

[jetfool]

Sounds like a plan. A linear servo might be the best. I'm sure you will figure it out.

We will leave next Friday morning around 2:30-3';00 AM. about a 4-hour drive. We can set up at 7"00 am and be ready for the show at 9:00 am. A long day but saves one night from paying $180. CRAZY! That $180 dollar is better spent on a new plane, LOLI plan to take lots of pictures and hope to post some while at the show. Everything is ready to go and excitement is starting to build. Toledo always gives me a fresh start for spring flying. Many of the scale flyers go out to eat dinner at PACHO's restaurant in the evening, a great time had by all. Klinger from MASH talked about it on the show.
Best Regards, Rex

[davegee]

Sounds like a plan. A linear servo might be the best. I'm sure you will figure it out.

We will leave next Friday morning around 2:30-3';00 AM. about a 4-hour drive. We can set up at 7"00 am and be ready for the show at 9:00 am. A long day but saves one night from paying $180. CRAZY! That $180 dollar is better spent on a new plane, LOLI plan to take lots of pictures and hope to post some while at the show. Everything is ready to go and excitement is starting to build. Toledo always gives me a fresh start for spring flying. Many of the scale flyers go out to eat dinner at PACHO's restaurant in the evening, a great time had by all. Klinger from MASH talked about it on the show.
Best Regards, Rex

Sorry, I was off by a week! I bet you guys will have a great time, going to places like that restaurant in Toledo. I never actually made it into the town of Toledo. But I'm sure it has a rich heritage and culture of its own. Yeah, hotel prices are really sky high these days. We had to stay one night in Billings, MT this week. It was a decent hotel, but $150 for the night. You start thinking...what could I buy with $150! In any event, I'm envious of your upcoming weekend next week. It is a perfect kickoff to summer flying season!

I'm hoping that I'll come up with a solution for a powered canopy. We had one on Fire Ball that was very cool, but it was a lot bigger airplane and easier to figure out how to do it. Space is a real issue with this smaller foamie plane. At a minimum, I'll have a manually operable canopy for the time being, and if I figure it out, I can make a mod at that time to power it. I just don't want to waste a lot of time when I could finish it up and fly it, just waiting on one little, but cool mod to make it operate like the real thing. P-51s never had a powered canopy that I am aware of, it was a manual crank on the right sidewall to open/close them. We'll see.

Cheers

dave

[vrosi1963]

still waiting for Park flyer plastics to confirm my plug has been signature received on April 1st UPS, very poor communication ,must be at the up coming Toledo rc show ?? end of the story ,will badger these people Monday after i got back from Kona yesterday for 7 days.

[davegee]

still waiting for Park flyer plastics to confirm my plug has been signature received on April 1st UPS, very poor communication ,must be at the up coming Toledo rc show ?? end of the story ,will badger these people Monday after i got back from Kona yesterday for 7 days.

Thanks, Good luck!!

davegee

[davegee]

I took out one of my FMS P-47s, "Ole Cock" for a shakedown flight today, after having the winter off hanging in the garage. I found while testing it a few weeks ago, the motor had a "grind" to it in one spot as I manually turned the prop shaft. I decided to replace that motor with a brand new replacement that I bought. I have no idea what might have gotten damaged inside there. I don't recall any prop strikes using this larger, more scale V3 FMS Corsair prop, but I didn't want to take any chances.

I'll post a couple pics I took this morning after the flights. This has the printed scale Curtiss Electric prop and the printed cuffs (courtesy of Elbee's design) that I printed and glued onto the base of the props. It does make a slightly different noise, not sure if it is due to the prop cuffs on, but it flies great, about the same and the Hamilton Standard version without the cuffs that I have on three of my four FMS 1.5M P-47s, including the under development Hairless Joe version that I hope to fly this spring sometime.

[jetfool]

Davegee, Great pictures. Beautiful visual too
Best Regards, Rex

[davegee]

Thanks. Your Lucky should fly very much like this one when you put it up in the air after the show. Really has a presence in the air for a foamie. I ordered three more of the E Flite bomb drop units that I’ll put in this one and two others so I can drop tanks from all of my jugs. I hope to do flight testing with at least one of my airplanes with this drop tank unit to see how it goes. Dan is working on the design for the 150 gallon “flat” tank that was used by several aircraft, especially P-47s. I’ll print up his V1 when he gets it done and we’ll go into flight testing with them. I think it shows promise, in theory. I already have experience with a 1/5 scale version I dropped in competition with FireBall almost 20 years ago.

[davegee]

James has been working hard on the plug for the canopy and has sent it to a small company to make some clear vacuform canopies for my Hairless Joe model. We're hopeful we'll get them to make these for us and send a couple to me, but I decided recently to look into backup alternatives if our primary canopies don't pan out for whatever reason. I decided to see if anyone else has a 1.5M P-47D bubbletop that maybe I could get a canopy from. Turns out, to my surprise there were at least two models. One is from Horizon and the other from Nexa, available from MRC.

I got a canopy from Horizon the other day, might work. Today, I received a fuselage and canopy attached to it from MRC which was an "open box" item and also ordered it, I think it was the last one in stock like that. I don't need the fuselage, but really need that canopy. It arrived today and it is almost perfect for my needs. I carefully cut the windscreen from the canopy and am positioning the parts how I want them to be fixed to the fuselage. The main plan is to still use the parts that James worked so hard on, but if that falls through from getting it vacuformed, I have a reliable and pretty accurate one from that one I bought from MRC.

I still hope to make the canopy powered from a servo, but we'll have to see how that goes. If nothing else, I'll have the canopy open using magnets and rails to let it manually open to show the details in the cockpit and pilot

Here's a few pics I just took. Just the very beginning of a new "sub" project!

[jetfool]

Man, that is looking great. Bob really makes the cockpit stand out. Going to be outstanding!
Best Regards, Rex

[vrosi1963]

Wow that looks very close , We will see very soon since i made contact today. since there is Minimal interest in this conversion as i figured , the pull run may be very small , maybe only 5 and i will be done. speak up quickly people