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RE: ESM 74 Corsair engine choice - 3/22/2012 10:31 AM   
midastouch_73


 

Posts: 66
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From: Corona, CA, USA
Status: offline 		Thanks Sawtooth... I hope it will too. I ordered some of that steel powder as well to help balance it. I'm not going to be able to use the pitts style exhuast unless I cut the firewall.... I don't really want to do that. I'm about 70% done. I'm on the process of mounting my EI and battery. After that I'll be rady to fool around with the CG. I had to have the True turn spinner prop mut machined so I don't have to use a prop adapter. The prop adapter would have increased the distance between the prop and the cowl. The guy did a great job at the LHS he even did it on the house....lol I guess tht was the least he could do after I he took the rest of my money....lol I'll pos some more pics soon...

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RE: ESM 74 Corsair engine choice - 3/22/2012 1:09 PM   
gwweber


 

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From: Gaithersburg, MD, USA
Status: offline 		I bought a pte36   It has a nice pitts muffler incl,uded with it.  Good for tight spaces.  It also has a real walbro carb, unlike my dle30 which has carb issues.   Have not run the pte yet  is going in a great planes 1.6 ultimate.  Was going to use a dle55, but the 36 will use a lot less gas and am doing a light build, plane is at 12 lbs and batteries in front was good to go no lead. Crossing my fingers.  The pte36 turns a 17.8 3 blade prop 7-800 rpm higher then the dle from what i read.  Wish me luck. 

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RE: ESM 74 Corsair engine choice - 3/23/2012 3:06 AM   
Sawtooth


 

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From: Caldwell, ID, USA
Status: offline 		Are you guys flying with Expo in the aileron, elevator and rudder? And, if so, what percentage of each? Or do you just fly on low rates....

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RE: ESM 74 Corsair engine choice - 3/23/2012 6:00 PM   
Sawtooth


 

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From: Caldwell, ID, USA
Status: offline 		As I go through the process of the initial flight of my Corsair, I have another question for the group. I took my out to our field yesterday even though the forecast was for "breezy". Breezy turned out to be 20-25 MPH wind. Strong enough to make it uncontrolable when you turned it into a cross wind. What I noticed is that the tail wheel strut seemed very mushy. I realize that it may not be an issue in a no-wind situation. Has anyone had any issues with unstable ground control. Obviously, I did not fly but even taxing down the runway the flex in the tail wheel strut made the plane almost impossible to keep straight. It was all I could do to keep a mild zig zag going. Hence my previous question on the amout of Expo anyone may be using.
Thanks....

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RE: ESM 74 Corsair engine choice - 3/23/2012 6:26 PM   
midastouch_73


 

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From: Corona, CA, USA
Status: offline 		 I'm using about 30% expo on all rates... Start will less then increase it. Be sure not to make hard and sudden movements. Starting with too much can be disastrous. Too much expo will give the effect of it feeling like a lack of control. I had the same issue. Also make sure your rates are set accurately. If your ailerons are not equally set it will affect your control. Too much throw and expo is a bad combo. If your stick feels like you have to push it too far to either side (mushy)to get a response you have too much expo. Hopefully you're not tail heavy also... That's No bueno...

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RE: ESM 74 Corsair engine choice - 3/24/2012 2:41 AM   
aghost



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From: Amarillo, TX, USA
Status: offline 		Sawtooth: Got in my first two flights of the year with my Corsair. Really flew well, just like the past two years. Anyway i have throws set per the manual. elevator expo 35%, aileron expo 30%, and rudder expo 25%. I fly with the elevator dual rate at 90% and land with it at 100%. 

Also I rechecked my CG since i did some work on the plane over the winter. Its now at 122mm, measured out on the wing as per the manual.

When i first started flying this plane, i did have some ground control problems and the rudder wires would be slack when I checked them. Turned out one side of the tailwheel bulkhead was not glued in well. Under a load it would move, but would come back to a normal looking position. Once i fixed that, ground control was OK. But I don't think its good enough for 25 mph crosswind.

Good luck with your maiden!

Brian


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RE: ESM 74 Corsair engine choice - 3/24/2012 4:09 AM   
Sawtooth


 

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From: Caldwell, ID, USA
Status: offline 		Hey thanks guys. I'm trying to go at this with thought and preparation. Currently, I'm at factory recommended 130mm C.G. but I am changing the ignition battery to six volt so it will add a tad bit of nose weight. I am glad to hear that these planes fly well. I'm looking forward to get this thing in the air. I had dialed in some Expo but will bump it up some more.
Thanks again for the info.

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RE: ESM 74 Corsair engine choice - 4/4/2012 8:46 AM   
midastouch_73


 

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From: Corona, CA, USA
Status: offline 		 I'm pretty much down to a few things now. So far things have been going pretty smooth. Well I guess that was until I dropped my wing while tring to adjust my retract up and down timing. I put a nice dent in!!! F me to tears...lol Be carefull to use a good prop to hold your wing up while making connections and adjustments to the corsair. The wing shape makes it a bit tricky. I'm about ready to fit the cowl and adjust the cg. I'm a bit leary about where to start but i think I'll start around 115 or 120. I'm definently not going with 130 for starters. I picked up some of that liquid metal to mix with some epoxy. I'm hoping that it doesnt put to much stress on the cowl.

I'm going to have to mount the cowl another way besides using the ring it came with. The ring wont fit around the DLE 55 with the exhuast. I may have to attach it form the outside worse case senario. I think I can avoid that though it's just going to take some measuring and test fitting. I also have to figure out the gear doors. They didnt include the springs needed to attach it per the directions. They get a fail for that!!!!! lol 

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RE: ESM 74 Corsair engine choice - 4/4/2012 8:51 AM   
midastouch_73


 

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From: Corona, CA, USA
Status: offline 		A few more pics... I was able to break the motor in and i'm hoping to do a maiden next week providing I sort out the CG and cowl issue. Also have to fing the spinner nut for the DLE. I don't want to use the prop adapter because it will add too much space between the cowl and prop. TBM has them but they are back ordered. Hopefully I can get my hands on one soon...

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RE: ESM 74 Corsair engine choice - 4/4/2012 1:43 PM   
aghost



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From: Amarillo, TX, USA
Status: offline 		As for cowl mounting, someone  with the larger ESM corsair had mounted the cowl ring (without the cowl) on the firewall. Then glued four or six mounting blocks around the cowl ring.

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RE: ESM 74 Corsair engine choice - 4/5/2012 11:43 PM   
Sawtooth


 

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From: Caldwell, ID, USA
Status: offline 		OK guys, I thought I was ready for a maiden flight but weather (wind) has that on hold. But I was prusing Troy Built Models the other night and came across a warning on C.G. that they have posted on every one of their warbird planes. In general is says that the stated C.G. in thier manuals may make the plane too tail heavy. They suggest that the wing be measured at the wing root and the C.G. be determined by taking 25% of that measurement. According to my feable math skills that would put the "suggested" C.G. at 110mm on this plane. Manual says 130mm. That's a huge difference. I had it balanced at 130mm but now it got my maiden flight jitters going so I changed the ignition batter to six volt (one more AA battery) I was planning on doing that anyway. I also moved the receiver battery to the motor box. I have not rechecked the balance but I'm hinking it's only going to be 120 to 125mm. I've heard of others flying this plane in that range. I could use some calming of the nerves on this C.G. issue.

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RE: ESM 74 Corsair engine choice - 4/6/2012 3:21 AM   
midastouch_73


 

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From: Corona, CA, USA
Status: offline 		 @Sawtooth.... I share your pain. I'm going with a cg of 120. I'm trying to find a spinner For the DLE 55. TBM is out of stock Unfortunantly. It's hard finding one that will fit with the prop bolts. I don't think it will effect the CG too much if I balance it without it. I hope not. lol

@Aghost. Thanks for that mounting ring tip that saved me a ton of time and cut the guess work out of it... Hopefully tomorrow I can mix the metal powered and add it to the cowl then mount it. Heres a pic...


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RE: ESM 74 Corsair engine choice - 4/6/2012 4:04 AM   
Sawtooth


 

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From: Caldwell, ID, USA
Status: offline 		Boy, a picture does say a thousand words. I guess I missed the cowl ring tip. What a pain messing with that thing. I guess it's a good idea to hide the mounting screws but when you use gas engines, there's a whole bunch more stuff that needs put in there. May be worth ordering another cowl and coverting. 120mm C.G. would be a good happy medium. Thanks for posting.........

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RE: ESM 74 Corsair engine choice - 4/6/2012 4:28 AM   
midastouch_73


 

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From: Corona, CA, USA
Status: offline 		Does anyone know where to find a dummy radia engine for the ESM 74 corsair? 

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RE: ESM 74 Corsair engine choice - 4/6/2012 1:45 PM   
aghost



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From: Amarillo, TX, USA
Status: offline 		Sawtooth, You can do a couple of things during the flight to give you an edge regarding the CG. On take-off with the gear down and a full tank of gas, the CG will be even more forward than your setting. Don't retract the gear until you are comfortable with the plane and it is at a good altitude. Raise the gear and see how it goes. Also don't make the first flight too long. keep as much fuel as possible to help with the CG. 

Brian






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RE: ESM 74 Corsair engine choice - 4/6/2012 2:19 PM   
aghost



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From: Amarillo, TX, USA
Status: offline 		Midastouch: Here's a link to an older thread on this same plane. Search the thread for "radial". There are several pictures of dummy radials. 

http://www.rcuniverse.com/forum/m_7626632/mpage_1/key_/tm.htm 

One posting included the following info:

Dummy radial engine options include TF 1/7 scale, FTE 1/6 scale (7.25" dia), and the williams 1/6 scale kit (tower item LXWAF4). 


Be aware that you will see a lot of discussion about the CG. Some folks were pretty sure one was risking disaster unless the CG was 100 - 105mm.

Brian
 

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RE: ESM 74 Corsair engine choice - 4/6/2012 3:59 PM   
midastouch_73


 

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From: Corona, CA, USA
Status: offline 		 Thanks for that info I'll be sure to stay away from that CG for sure. I saw the radial engine thread thanks. I ordered the radial dummy from tower hobbies. It was about $20

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RE: ESM 74 Corsair engine choice - 4/7/2012 3:49 AM   
Sawtooth


 

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From: Caldwell, ID, USA
Status: offline 		Aghost.......thanks for the maiden flight tip. I had decided not to retract the gear (just in case) but the short flight to keep the fuel tank fuller is a good idea as well. We had a guy in our club that had an awesome P-47 with a lot of scale detail. Full cockpit, with working canopy. He had another guy do the maiden. Everything was going well until the landing. When the flaps were deployed, the plane nosed in. Come to find out that the owner had programed in some down elevator when the flaps were deployed. But instead of 3% he had put in 30%. Man, what a shame. But it is helping me formulate a maiden flight plan. Keep it simple.

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RE: ESM 74 Corsair engine choice - 4/12/2012 3:43 AM   
midastouch_73


 

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From: Corona, CA, USA
Status: offline 		Finally got a chance to set the cg at 120mm. I used a sandwich bag to measure the powdered steel. It to a bit of adding and subtracting from the bag to get it right. After I mixed it woth epoxy it was actually a bit nose heavy. I gronden away some of the finished produc and brought it back to level on the cg machine. I was able to screw the cowl on from the outside with some button head screws which ended uo working pretty well. Only mishap was drilling the hones in the cowl ring mounds before placing the cowl on. Thanks to masking tape I was able to line up the holes and attach the cowl. I'm only missng my spinner hub whic should be here any day.... The raial engine I purchased came but it was too large gotta send it back.....

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RE: ESM 74 Corsair engine choice - 4/12/2012 3:52 AM   
midastouch_73


 

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From: Corona, CA, USA
Status: offline 		A few shots of the bird awaiting a maiden flight once the weather clears up a bit.....

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RE: ESM 74 Corsair engine choice - 9/12/2012 3:34 AM   
mikes68charger


 

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From: , OH, USA
Status: offline 		Well guys I just finished my build.

Its a ESM Corsair 74  I went with a new DLE RA 55 with a 20X12 3 blade prop 

What you guys think?

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RE: ESM 74 Corsair engine choice - 9/12/2012 10:33 AM   
Hill202



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From: Peachtree City, GA, USA
Status: offline 		Looks great, I bet it flies good with the extra power.

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RE: ESM 74 Corsair engine choice - 9/12/2012 4:16 PM   
midastouch_73


 

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From: Corona, CA, USA
Status: offline 		LOOKING REALLY GOOD!!! That prop looks awsome. Have you maiden it yet? I lost my corsair 2 months ago. It went down in a blaze of glory. The only thing that survived was 4 servos, my reciever and the pilot. He ejected after all hell broke loose. The engine was a total loss.... I'm building a ESM SEAFURY now. Almost done with it......

 

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RE: ESM 74 Corsair engine choice - 9/13/2012 1:42 AM   
mikes68charger


 

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From: , OH, USA
Status: offline 		 Yes I got 2 flights in today and it rocks!

I need to add a little right thrust as it took all the rudder I had (40mm) to control that big motor and prop set up

The prop looks good on the ground and in the air as you can see the hub and spinner why doing low fly buys

I put my CG at 120mm and the factory throws for elevator where great

This bird has hardly any change when when flaps are down I used 50mm of flaps



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