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New Giant Top Flite F6F Hellcat coming soon?

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Old 06-22-2019, 09:43 AM
  #301  
Sizemore N
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I was finally able to put my first flight in on my TF Hellcat. No surprises ,it flew perfect, everything worked like it was supposed to. A big relief after all the headache I had putting it together.
I have a DLE 61 on it with a wraparound muffler, it is a perfect fit and match for the airplane, plenty of power.
Looking forward to many more flights

Norman
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Old 06-22-2019, 10:37 AM
  #302  
Lifer
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What prop were you using?
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Old 06-22-2019, 11:53 AM
  #303  
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23x10 falcon

it worked very well
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Old 06-22-2019, 05:00 PM
  #304  
karl hibbs
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Keep an eye on the engine mount and the weights on it. They do fly nice.
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Old 06-23-2019, 07:29 PM
  #305  
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Thanks for the heads up, have you seen engine mount failures? If so what kind.
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Old 06-24-2019, 04:59 AM
  #306  
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At about 10 flights every thing come loose.
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Old 06-24-2019, 10:09 PM
  #307  
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I drill the head of the screws and safety wire the motor mount bolts inside and out. If I take off the carb I also safety wire the carb bolts. The exhaust bolts as well, never had a problem since I started doing this.
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Old 06-30-2019, 04:20 PM
  #308  
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Originally Posted by ForcesR View Post
This diagram was posted in RC Groups a while ago. The FG90 R3 engine is 250mm diameter, or 9.84 inches diameter, or 9 - 27/32" diameter.

UMS 75 CC. Diameter: 9 inches
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Old 07-03-2019, 05:34 AM
  #309  
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Any significant change in the trim with gear up or down (caused by a CG shift)?
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Old 07-13-2019, 08:18 PM
  #310  
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MAIDEN FLIGHT DONE!!

Flew my friends Hellcat today and let me just say it was perfect!
He has it set up with a Saito FG60 and Zoar 22x10 prop.
I received the plane assembled mostly but required the final radio install and go over the retracts because he said there where issues them. Won’t bore you with the details.
Anyway, the FG60 is a pretty good match to this plane. The speeds and power are scale like and then some so you have that little bit extra. I had to lean it out but otherwise the engine was right on step. It’s very efficient on fuel.
Fuel - 91 non-ethanol with Klotz Technoplate at 20:1

I flew my Corsair for a warm up and when the Hellcat was ready after preflight and range check it was up next. Ran up and down the runway at a fast taxi to get a feel for it. I was concerned about the the gears narrow stance at first but when I reworked the gear I added some toe out to help ground handling and stability. Proved to be the trick, again, and the Hellcat tracks very nicely. It does have a tendency to swing the tail around at a certain speed so watch that. I gave the tail wheel just enough steering that it could turn around on our runway from edge to edge.

I was ready to go, engine was running fine, cylinder temps around 170F, and the wind down the runway. Added power, a little rudder, no flaps, and it lifted off sooner than I expected. It was on the wing and tracking fine. I got up and half way around the field then hit the retract switch for the first time and to my relief after all the tweaking on the gear they came up and locked. I got the gear so smooth they work at less than 10lbs to go down and about 20-25lbs to go up. I heard them lock and I was happy.

Flew around and trimmed the plane. I was surprised it required a bit of trim in all three axis. No worries trimmed it out and all was good again. I should note the plane was balanced at 6 inches per the book, empty, gear up and inverted. There’s no noticeable CG shift as the gear retracts it’s just like the Corsair, non-event.

Took the the plane up to about 300 feet and performed a few stall tests. This was the best part, it has no bad or violent stall traits. It just waffles like a falling leaf. So nose level, gradually pulling up elevator and reducing the power to idle until your at full up and idle. The plane just drops the nose and rocks back and forth. Compared to the Corsair that was just great. The Corsair will likely drop the left wing and depart but the Hellcat just mushes through safely. Drop the nose and add power like nothing happened.

Next came the flaps laps because I was expecting having to mix elevator trim in but no, none needed. The flaps are powerful so at half flap and just above idle I was cruising around at very low speeds with no indication of a stall. I increased the flaps to full and I could fly even slower. At this point I added power and then dropped the gear to see the what it would do. There again the plane showed no noticeable CG change or any bad habits. Instead it was stable and just required a little more power due to the drag.

Gear down and full flaps it felt good so I decided to land. Came around, lined it up and made a very smooth first landing.

I had a little fun with it getting comfortable so a few rolls a hammer head and some laps around the field was all it took to understand it. Rolls are faster than the Corsair even though the ailerons are pretty small, have not directly compared the size but for about the same size and deflection the Hellcat is more responsive in roll.

You do need to fly the Hellcat at speed. Unless your going to fly the rudder it does tend to slip through the turns but if it has speed then it tracks better.

So all in all it’s a very good plane and a very good candidate to scale it out.

Couple notes: I modified the cowl to increase cooling for the FG60 by cutting the flaps and opening them by 10mm.
Also if you are considering this engine then take a look at mounting it with the #1 cylinder inverted. The 3 bolt cowl pattern will be covered up by the 3 cylinders. It is a huge PITA to get to the bolts and I ended up wasting an hour cramming my hands in the cowl fumbling with a hex driver just to get two to work. The top bolt is totally obscured by the cylinder. So plan accordingly.

Scale note: the cowl is wrong. The two panel lines on the chin are incorrect and the lower cowl flaps are missing. Just FYI.

Im not a huge Hellcat fan but after this experience I am now. Very cool plane and lots of historical significance.

Happy landings...






Last edited by Chris Nicastro; 07-13-2019 at 08:25 PM.
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Old 07-13-2019, 08:29 PM
  #311  
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Some photos from today...
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Old 07-14-2019, 06:11 AM
  #312  
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Nice job on the cowl flaps, I just might do that to mine.

Karl
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Old 07-14-2019, 04:22 PM
  #313  
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Thanks Karl, easy job, used a razor saw to cut it cleanly. The FG60 ran cool so I don’t see the need to cut more cooling holes right now.
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Old 07-19-2019, 05:36 AM
  #314  
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I am assuming you meant "toe-in" on the landing gear. Toe-in gives more stability than parallel wheels. Toe-out would give significant instability in taxiing/takeoff. I also have opened the cowl-flaps as you. I have the DLE-61. Great to hear about little to no trim change with gear down/up or flaps down/up.
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Old 07-19-2019, 08:12 PM
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FYI The ME 109 and FW 190 both used Toe Out. . Just saying.
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Old 07-20-2019, 10:46 PM
  #316  
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Originally Posted by Planejaw View Post
I am assuming you meant "toe-in" on the landing gear. Toe-in gives more stability than parallel wheels. Toe-out would give significant instability in taxiing/takeoff. I also have opened the cowl-flaps as you. I have the DLE-61. Great to hear about little to no trim change with gear down/up or flaps down/up.
No actually I do mean toe out. Iíve practiced this on all my planes for years and it is very helpful in calming down a plane upon landing. The amount is very subtle. In fact with retracts Iím counting on the inherent play in the strut scissor link to give the wheel just a couple degrees of toe out.
Toe in will typically aggravate a problem landing and cause a tank slapper from wing tip to wing tip.
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Old 07-20-2019, 10:50 PM
  #317  
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Second flight on the Hellcat today, handles the wind just great! I was flying only a couple minutes and wind just picked up to around 10kts but it handled it just fine.
The guys mentioned they think it’s faster than the Corsair with the DLE 61.
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Old 07-24-2019, 05:52 PM
  #318  
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So few people talking about this plane I’m surprised.
I flies so good I would think more people would be talking about it or showing mods.

I was was talking to a buddy of mine about getting one of the RTC’s and glassing it then painting it all gloss dark blue. Has anyone glassed this plane yet?
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Old 07-24-2019, 08:31 PM
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Hi Chris, I am surprised that this isn't a very popular airplane also.. You don't get a much better flying plane than this. I am also surprised on how fast it is and the super slow landing speed. I am taking it to a local event this weekend and having some fun.
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Old 07-24-2019, 09:11 PM
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Originally Posted by karl hibbs View Post

Hi Chris, I am surprised that this isn't a very popular airplane also.. You don't get a much better flying plane than this. I am also surprised on how fast it is and the super slow landing speed. I am taking it to a local event this weekend and having some fun.
Great looking F6F, but is the front antennae backwards?? Also, is that a Sierra Gear? Any modifications to make it fit?

Last edited by LtMash1A; 07-24-2019 at 09:14 PM.
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Old 07-25-2019, 04:31 AM
  #321  
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Beautiful photo. Feel free to post some more. I think you will see more of these pop up after the next winter building season. Or at least I hope so. Have we seen this reviewed in Model Aviation or MAN?

Regards
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Old 07-25-2019, 05:09 AM
  #322  
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Nope
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Old 07-25-2019, 04:12 PM
  #323  
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Oh yeah I see the castle nut on that axle, pretty cool, but I got the Robart gear to work perfectly for this plane. Had I not fixed it though I would have suggested Sierra gear to my friend. It really annoys me that I had to fix brand new gear. I never touched the gear in my Corsair or P-51 or several others, they just worked.

I agree on the speed range it’s pretty broad and the stall is so mellow I’d say this one makes for a very good candidate as a first big warbird for someone with tail dragger experience.

Maybe more will post soon towards the end of this season. Hope so, I’d like to see a scale mod project on this one.
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Old 07-25-2019, 04:15 PM
  #324  
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Oh the antenna post up front should be vertical with the tapered edge on the back. The one on the tail is correct.
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Old 07-25-2019, 05:17 PM
  #325  
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Sorry Guys I didn't pay much attention to the antenna when I put it in so you will have to deal with it for now.

Karl
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