RE: H9-F6F Hellcat 60 ARF (Full Version)

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chuck993 -> RE: H9-F6F Hellcat 60 ARF (11/7/2009 1:18 PM)

I have a zenoah G20EI sitting around that I keep thinking of putting in the hellcat, but I figured it would weigh too much and make it a sled on dead sticks. What do you think? Also, what did you do for re-enforcing the horizontal stab?



da Rock -> RE: H9-F6F Hellcat 60 ARF (11/7/2009 2:29 PM)


quote:

ORIGINAL: chuck993

I have a zenoah G20EI sitting around that I keep thinking of putting in the hellcat, but I figured it would weigh too much and make it a sled on dead sticks. What do you think? Also, what did you do for re-enforcing the horizontal stab?


That is a quandry. The OS90FX has just under 3hp and weighs what most 60s weigh. I've put them into the Corsair, Spitfire and P47 and not had to add any weight at all to balance. The glows that suit that plane are at least 10 ounces lighter than the G20EI is without it's ignition system.

They may be warbirds, but they're fighters not C130 warbirds.

The gasser mfgs definitely need to make their little guys lighter somehow.



chuck993 -> RE: H9-F6F Hellcat 60 ARF (11/7/2009 3:48 PM)

That was how I was feeling, I have an OS 91FS and an OS 91FX, both with a couple of flights on them, which way would you go? The 91FX would provide HP.



da Rock -> RE: H9-F6F Hellcat 60 ARF (11/7/2009 6:43 PM)


quote:

ORIGINAL: chuck993

That was how I was feeling, I have an OS 91FS and an OS 91FX, both with a couple of flights on them, which way would you go? The 91FX would provide HP.


I chose the 91 over a 61 for my first H9, which was the P47, simply because I knew it'd swing a significantly larger 3-blade prop. I knew the model wouldn't really need the almost 50% increase in power. A few other guys were flying H9 Warhawks back then, and their 61s were more than adequate.

Since I wasn't looking for the extra power, I really didn't use it to begin with. Well, one day I decided to see what it did for the flying. Yeah, the plane will be faster but not much. I discovered that the speed I'd been getting with about 2/3 throttle wasn't much slower than full throttle. It had appeared to be faster with the throttle at 2/3 and darned if the extra speed did much for the flying. Until the pylon guys start up an Unlimited class based on full scale unlimited all you seem to get out of having all that extra power is a throttle that's less sensitive. The useful speed range you can get is in the first half of the stick movement. The stick doesn't change things much in it's top half of the movement.

I'd choose the weaker of those two. It still should turn a decently large 3-blader.

BTW, the 3-blader turned out to fly the suckers just as good as the best 2's I tested. You're not giving up, you're gaining from using a 3 on this plane with that engine.



Navy0968 -> RE: H9-F6F Hellcat 60 ARF (11/8/2009 12:09 AM)

This will supplement my previous posting of 9/15/09. Finally found the time to fully complete the "cat". Here are a few pics showing the dummy engine and pitts muffler installation.

Jim



RBean -> RE: H9-F6F Hellcat 60 ARF (11/8/2009 2:58 AM)

Chuck993

I love my gasser. Don't miss the cost and the mess of glow. The weight is a little more than glow because not only is the engine heavier, you need an ignition battery. However, the Hellcat has a large wing and handles the weight well. It's not a floater at this weight, but its not tricky or difficult to fly. Unlike some of the heavy scale warbirds, take offs are quick and easy and the landing speed is not real fast. I did have to mount both batteries in the rear fuslage about three or four inches in front of the horizonal stablizer to get the cg correct. Stalls are gentle. It stalls and falls off on the left wing some but that it controllabe with rudder and recovery can be made with little altitude loss . I have a Top Flight P-40, and when it stalls, it snaps inverted to the left and heads straight down. Also, at this weight and with somewhat faster landings and takeoffs, the stock landing gear is marginal. My Century Jet retracts are fine. If you have a gasser and want to use it, go for it. I reinforced the horizonal stablizer by removing the top covering and placing diagonal tusses between the ribs. I reinforced the wing by adding ply wood panels that went between the retracted gear legs and the air cylinder in front of and behind the spar.



RBean -> RE: H9-F6F Hellcat 60 ARF (11/8/2009 3:02 AM)

I forgot, I did have a dead stick once and had to 360 it down to the runway and land. This is when the throttle linkage came off on Hellcat one and I had to fly around until it ran out of gass. I didn't have an electronic kill switch.



aghost -> RE: H9-F6F Hellcat 60 ARF (11/8/2009 3:36 AM)

chuck993: I have a Magnum XLS 91 (similar to the OS 91FX) with a Pitts style muffler in my Hellcat. I modified the firewall to rotate the engine to 9 o'clock position. Its not a trivial modification because the firewall is set up for a four stroke engine at 7 o'clock. The backside of the firewall is not flat, but has a cross shaped reinforcing for the four stoke set up, but does not quite fit the two stroke at 9 o'clock. I filled in "holes" to make the back of the firewall flat, then drilled new mounting holes. With all the firewall mods and reinforcing I had to add 3 ozs of lead on the tail.

I had the H9 Corsair and with the Magnum XLS 91 at 7 o'clock. With the Pitts muffler, the exhaust came out on the wing and left wheel well. I did not like that. Hence the current setup in the Hellcat.

To strengthen the horizontal stab, I ran a piece of carbon fiber along the bottom of the trailing edge of each side and put a white covering over carbon fiber. Worked so far.

Everything else is stock, including the retracts. 159 flights over two seasons and counting.

Brian



mrsand -> RE: H9-F6F Hellcat 60 ARF (11/10/2009 1:18 AM)

My slow assembly project is within sight of completion....I am trying to mount the rear landing wheel and rudder...Could I trouble you fellows to give me the distance from the top of the rear wheel to the fuze diectly above it..for a stock wheel setup...thanks in advance for your help

MrSand



CRG -> RE: H9-F6F Hellcat 60 ARF (11/10/2009 8:22 PM)

Fantastic job on the entire build, very well done.

Would love some more details on the dummy engine.

quote:

ORIGINAL: Navy0968

This will supplement my previous posting of 9/15/09. Finally found the time to fully complete the ''cat''. Here are a few pics showing the dummy engine and pitts muffler installation.

Jim




mrsand -> RE: H9-F6F Hellcat 60 ARF (11/16/2009 1:00 PM)

I just finished sawing off my ca glued elevators and re-attached them with dubro hinged pins. Its the first time doing this. The elevators work fine..all the hinges are swinging good and are tight...however the gaps are +- 1/8 inch along the control surfaces. Is the gap to big..if so whats the right way to close it. Thanks for your advice.

MrSand.



CRG -> RE: H9-F6F Hellcat 60 ARF (11/16/2009 3:08 PM)

Definitely too big of a gap. The pinned hinges need a groove in each surface to accept the larger section of the hinge (with the pin), though it may be too late for that. Iron a strip of UltraCote along the hingeline to close it, not much else you can do at this point. Clear tape would work also but then you would still see the gap.

One of the nice things about CA hinges is the small gap they typically produce. Why'd you change them?



Wulf -> RE: H9-F6F Hellcat 60 ARF (11/16/2009 3:49 PM)

CA hinges are OK but keep your eye on them.I`ve had them tear in the past.



chuck993 -> RE: H9-F6F Hellcat 60 ARF (11/16/2009 4:09 PM)

I put a 91FSII four stoke in it and ran the muffler straight down, does anyone know how much clearance this plane has? I'm going slow myself putting it together, but it looks sort of weird with that much muffler sticking out. I fly off of a grass field too.[:o]



mrsand -> RE: H9-F6F Hellcat 60 ARF (11/16/2009 5:26 PM)

CRG

I wasn't paying enough attention to the arf manual...forgot to include the joiner wire first...snafu..I also did not recess the hinge center into the control service..don't want to pull them off again sooo
guess I can place some tape on each side to help tighten the gap.



CRG -> RE: H9-F6F Hellcat 60 ARF (11/16/2009 6:04 PM)

That happens, have done similar things. You should be ok with tape to seal the gap. That'll improve control authority and reduce flutter potential a little.



rcavi8ter -> RE: H9-F6F Hellcat 60 ARF (11/25/2009 10:47 PM)

Does anyone know where to get scale strut covers. I have seen a couple guys in this thread with some. Anyone want to mold me a pair? My Hellcat should be RTF next week.



RBean -> RE: H9-F6F Hellcat 60 ARF (11/26/2009 6:27 PM)

rcavi8ter,

I think Robart makes plastic scale strut covers that fit over the wire struts. I had some years ago on a Top Flight Corsair. However, every time I landed and the wire flexed, they would split or brake. Since I used Century Jet retracts and struts I didn't need any on my Hellcat. I made my wheel well door from sheet aluminum and mounted them with 3/8" door brackets from Century Jet.



chuck993 -> RE: H9-F6F Hellcat 60 ARF (11/26/2009 11:48 PM)

Looks nice.
Aren't the century retracts pretty expensive?



RBean -> RE: H9-F6F Hellcat 60 ARF (11/27/2009 5:03 AM)

chuck993,

The Century Jet retracts are not cheap. List is about $280. Some times you can find them at $230-$240. But every thing you need comes with them. Retracts, struts, air tank, air line, air filler valve, air regulator valve etc. I own three pair of them, all rotator types as in the Hellcat. They are a lot of work to install in the Hellcat because because the mounting flang is on the bottom of the retract instead of on top like the hanger nine. Also the gear needs to be mounted as deep in the wing a possible so you can have in raked forward slightly and it still be mostly in the wing when retracted. Also have to cut enlarged hole in the spar for the air cylinder and then reinforce the wing in the wheel well area. I use wheel collars on the air lines for adjusting the speed of the gear.

I have found the CJ gear to be stronger than Robarts and less expensive than Seirra retracts. The only problem I have found with the CJs is they use rivets to hold the oleo sissors on, which develop slop with use. I replace the rivet with small nuts and bolts, and that solves the problem.

If the gear is simple folding gear like the P-51 or P-47, I prefer Spring Air Robo Strut ready gear. I have one pair and they work great, so far. They are $130 but then you need to purchase Robo struts, and I think the CJ refill valve is better.



Chad Veich -> RE: H9-F6F Hellcat 60 ARF (11/27/2009 5:43 AM)


quote:

ORIGINAL: rcavi8ter

Does anyone know where to get scale strut covers. I have seen a couple guys in this thread with some. Anyone want to mold me a pair? My Hellcat should be RTF next week.



I have the gear doors if that is what you're after rcavi8ter.

[IMG]http://i23.photobucket.com/albums/b376/CVEICH/HELLCAT/GEARDOORS.jpg[/IMG]



rcavi8ter -> RE: H9-F6F Hellcat 60 ARF (11/27/2009 5:39 PM)

Chad that is exactly what I was looking for. I sent you a PM. Those are must haves. I was going to pull them off of my old Marks Model Hellcat



mrsand -> RE: H9-F6F Hellcat 60 ARF (11/29/2009 2:16 AM)

I have mounted a sullivan external glow plug bracket on my H-9 hellcat firewall to heat up the Saito 100 glow plug.
There's a lot of wire to manage. Is is ok to shorten the white wire between the plugs by cutting and taping? Also, is it ok to ground the black wire to the metal engine mount truss? Any good advice would be appreciated. Thanks.

MrSand




w1nd6urfa -> RE: H9-F6F Hellcat 60 ARF (11/29/2009 5:11 AM)

The answer is yes and yes, although soldering is better than just taping

Any trouble with the Saito?



mrsand -> RE: H9-F6F Hellcat 60 ARF (11/30/2009 12:31 AM)

w1nd6urfa

I have had no trouble with motor...it hasn't flown yet, but it has a tank or two of fuel burned through it. Dialed it in pretty close yesterday with a friend..had it idleing at 28-2900...motor would rev from bottom of throttle to top end without missing...top end about 97-9800...using 15 nitro multi-viscosity synthetic.

I will cut the current wire to a length of 4 inches...solder together, then route the ground wire along bottom of firewall and place the metal ring connector between engine mount and engine at the mounting bolt. Thanks for all advice.

Mr.Sand




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