Hellcat Brotherhood
11-10-2013, 01:43 PM
#51
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TXAG96,
How does your plane fly? Is it a little under powered? The reason I ask is a fellow modeler built a Bates for me and we set it up for a G62. Using the weight of the engine to
compensate for the CG. While that part has worked out I'm worried we have too much engine and it is a tight fit.
I don't know about you but I really like looking at all the other paint schemes on this post. It kinda helps deciding which way to go. Capt. Dan
How does your plane fly? Is it a little under powered? The reason I ask is a fellow modeler built a Bates for me and we set it up for a G62. Using the weight of the engine to
compensate for the CG. While that part has worked out I'm worried we have too much engine and it is a tight fit.
I don't know about you but I really like looking at all the other paint schemes on this post. It kinda helps deciding which way to go. Capt. Dan
11-11-2013, 09:47 AM
#56
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Capt.Dan
I guess it would probably be considered underpowered vs a G62. If I did it again I would probably go with a G62 or DLE 55 but the G45 does fly it just fine. It will loop and do all the basic warbird stuff without problem but it is not a 3D plane and will not go vertical for long.
Have you flown it with the G62? Elevator flutter is a problem I had with the plane and that was fixed with the servos mounted in the horizontal stab. It is a great flying solid plane. I am very happy with it. I think it weighs about 24 - 25 lbs.
I guess it would probably be considered underpowered vs a G62. If I did it again I would probably go with a G62 or DLE 55 but the G45 does fly it just fine. It will loop and do all the basic warbird stuff without problem but it is not a 3D plane and will not go vertical for long.
Have you flown it with the G62? Elevator flutter is a problem I had with the plane and that was fixed with the servos mounted in the horizontal stab. It is a great flying solid plane. I am very happy with it. I think it weighs about 24 - 25 lbs.
11-11-2013, 11:18 AM
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Hi,
I'm getting ready to build the wing (JB 96") starting with a plywood mockup of the landing gear bay section to work out any un-forseen problems. On the plans it shows the main L.G. strut length of 11.75 inches ( Hinge to axle distance) but the Robarts gear is only 9.75 inches. Two inches is quite a bit That did not bother me too much, figuring I would build the strut section using Robart's rotating retract mechanism. Just got off the phone with a nice gent at robart's and he said that an 11.5 inch strut length could not be retracted because of the longer moment arm...So I'm open to suggestion. I do want to keep it as scale as possible...within reason. I just had a thought, (a rare phenomenon) When the prototype 1:1 sits on the gear it compresses the oleo so maybe I can get an inch back that way???
Thank guys and thanks Vets
I'm getting ready to build the wing (JB 96") starting with a plywood mockup of the landing gear bay section to work out any un-forseen problems. On the plans it shows the main L.G. strut length of 11.75 inches ( Hinge to axle distance) but the Robarts gear is only 9.75 inches. Two inches is quite a bit That did not bother me too much, figuring I would build the strut section using Robart's rotating retract mechanism. Just got off the phone with a nice gent at robart's and he said that an 11.5 inch strut length could not be retracted because of the longer moment arm...So I'm open to suggestion. I do want to keep it as scale as possible...within reason. I just had a thought, (a rare phenomenon) When the prototype 1:1 sits on the gear it compresses the oleo so maybe I can get an inch back that way???
Thank guys and thanks Vets
11-11-2013, 12:31 PM
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Check6,
Originally, I got a set of retracts from Lee Robinson (Robinaire). They were horrible and took forever to recieve but worked...sort of. I then designed and built a set myself and sold them to a buddy for his Hellcat. I have a Smithy mill / lathe combo. They work well. He lost his Hellcat and gave them back to me so I am now using the ones I built.
I would probably recommend Sierra but they are pricey. I think Robart would be too tight in that wing as it is not deep enough. Century Jet would probably work fine too as they are shown on the plans.
Originally, I got a set of retracts from Lee Robinson (Robinaire). They were horrible and took forever to recieve but worked...sort of. I then designed and built a set myself and sold them to a buddy for his Hellcat. I have a Smithy mill / lathe combo. They work well. He lost his Hellcat and gave them back to me so I am now using the ones I built.
I would probably recommend Sierra but they are pricey. I think Robart would be too tight in that wing as it is not deep enough. Century Jet would probably work fine too as they are shown on the plans.
11-11-2013, 12:52 PM
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I have been trying to get Sierras from Darryll for over two years. He has 50% of my money and all I have are empty promises..'nuff said about Darryll. Do you have any photos or prints of your retracts that you would care to share? I'd like to put my mill and lathe to work.
I have scaled up Robart's rotating retract head and like you said it was tight. I can move the plate were the gear mounts and gain a bit of wiggle room. Just got a nice bunch of outstanding quarter sawn Sitka Spruce from Aircraft Spruce for spars. Outstanding buy at $37 bucks. about 30 pound of boards from 14 inches to 51/2 feet.
Thanks Richard
I have scaled up Robart's rotating retract head and like you said it was tight. I can move the plate were the gear mounts and gain a bit of wiggle room. Just got a nice bunch of outstanding quarter sawn Sitka Spruce from Aircraft Spruce for spars. Outstanding buy at $37 bucks. about 30 pound of boards from 14 inches to 51/2 feet.
Thanks Richard
11-11-2013, 01:13 PM
#61
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Richard,
Wow, Your experience with Sierra sounds similar to mine with Robinaire. That is actually one of the reasons I got my own machining equipment. That and I just like to cut metal. I do have some basic drawings. SInce I machine everything myself I don't worry about tolerances on the drawings. I will see what I have. I used bevel gears for the rotation which I got from SDP-SI.com. If I did it again I would probably try to use the same method robart uses. All the rest pretty much came from McMasterCarr (clippard actuators, standard bushing etc). I will see what I have for drawings when I get home.
Jeff
Wow, Your experience with Sierra sounds similar to mine with Robinaire. That is actually one of the reasons I got my own machining equipment. That and I just like to cut metal. I do have some basic drawings. SInce I machine everything myself I don't worry about tolerances on the drawings. I will see what I have. I used bevel gears for the rotation which I got from SDP-SI.com. If I did it again I would probably try to use the same method robart uses. All the rest pretty much came from McMasterCarr (clippard actuators, standard bushing etc). I will see what I have for drawings when I get home.
Jeff
11-11-2013, 02:44 PM
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Thanks Jeff, that is very kind of you.
I figured two different tooth bevel gears would be needed since the retraction angle I would want is 100° and the rotation angle is 90°. One would need a gear ratio of 1:1.1, so when the gear retracted the full 100° it only rotates the wheel ass'y 90°. If the retraction angle is the same as the rotation angle, simple miter gears can be used, unless I'm mistaken. I tried to find that ratio of ten teeth and eleven teeth small enough to fit but no luck. I have never cut a gear before...Never too late I guess.
I'll give SDP-SI a look however I'll think more about the Robart design.
Richard
I figured two different tooth bevel gears would be needed since the retraction angle I would want is 100° and the rotation angle is 90°. One would need a gear ratio of 1:1.1, so when the gear retracted the full 100° it only rotates the wheel ass'y 90°. If the retraction angle is the same as the rotation angle, simple miter gears can be used, unless I'm mistaken. I tried to find that ratio of ten teeth and eleven teeth small enough to fit but no luck. I have never cut a gear before...Never too late I guess.
I'll give SDP-SI a look however I'll think more about the Robart design.
Richard
11-11-2013, 04:39 PM
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Just finished scaling the length of the main gear in the squatted position, it comes out to be 10.4 inches pivot to axle center lines. That is a lot better. still have to get the 5° axle camber....R
11-12-2013, 04:41 AM
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Richard,
I apologize I did not have the time to look for the drawings last night. You are correct about the gear ratios. I decided to split the difference and have a 95 degree retraction / rotation angle (1:1 ratio on the gears). I built in a little toe in when the gear is extended, and a little over rotation when retracted. That is one advantage I see with the sierra or robart method. I think Brian Taylor has retract plans on his corsair plans which could also be adapted. You could get an idea of how those work by looking at some pictures on some build threads. I am pretty sure I saw a picture of those that someone had built on rcscalebuilder.com. The Brian taylor method is similar to the 60 size robart rotating retracts. It uses a gear on the end of the strut shaft which mates with slots cut into the retract frame. Anyway, I will try to get those drawings this evening when I get home.
Jeff
I apologize I did not have the time to look for the drawings last night. You are correct about the gear ratios. I decided to split the difference and have a 95 degree retraction / rotation angle (1:1 ratio on the gears). I built in a little toe in when the gear is extended, and a little over rotation when retracted. That is one advantage I see with the sierra or robart method. I think Brian Taylor has retract plans on his corsair plans which could also be adapted. You could get an idea of how those work by looking at some pictures on some build threads. I am pretty sure I saw a picture of those that someone had built on rcscalebuilder.com. The Brian taylor method is similar to the 60 size robart rotating retracts. It uses a gear on the end of the strut shaft which mates with slots cut into the retract frame. Anyway, I will try to get those drawings this evening when I get home.
Jeff
11-12-2013, 08:56 AM
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Sign me up! I have a bates hellcat with F.G. fuse(Bob Holman). 80 inch wingspan. It will have a D.A. 50cc engine, and sierra retracts. Sorry, I just realized that I already posted this. I can't wait to get my workshop up and running to build this Hellcat!
Last edited by rcmichael; 11-12-2013 at 09:05 AM.
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11-12-2013, 12:45 PM
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Last edited by Chad Veich; 11-12-2013 at 05:48 PM.
11-12-2013, 05:37 PM
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Richard,
Well, I am not sure my drawings are quite good enough to send out, I tried to upload a few shots of the solid models but rcu doesn't seem to be taking them. PM me with your email and I can send you some of what I have if you want.
Jeff
Well, I am not sure my drawings are quite good enough to send out, I tried to upload a few shots of the solid models but rcu doesn't seem to be taking them. PM me with your email and I can send you some of what I have if you want.
Jeff
11-12-2013, 06:04 PM
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(Having trouble posting a picture of the RAF invasion striped F6F.)The F6F has been accused of just being too ordinary looking. Well, here is a version of this fabulous warplane that is surely anything but "ordinary" (?) looking. Given its great service record in the defense of Western Civilization values and Britain's critical roll in the world's most decisive war, surely it would be a great choice for a RTF model. I would surely buy at least an operational and standby model of this great plane!
Please help me campaign for this under appreciated piece of historic flying art.
https://www.facebook.com/richard.porter.167 brings up a sample of some of my other battles that are keeping me pined down a lot.
Rolling in to attack now.
Out.
PS http://www.rcuniverse.com/community/...g&memid=266748 might help show a motive behind the destruction of my web sites and pictures.
FIGHTERS - AVIATION'S ULTIMATE CALL TO GLORY, HONOR, AND IMMORTALITY (Rom. 2)
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Spitfire Brotherhood (All Spitfires Welcome) #64 - Post #407 - Battle of Britain & Winston Churchill relevancy to modeling - http://www.rcuniverse.com/forum/fb.asp?m=11007416 PLEASE SEE POST 852 (Page # 35) on Spit thread for FANTASTIC INFO. See why we fight - www.goodfight.com
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The following URL brings up the most concise, non-technical (with technical references) discussion about the revolutionary THORIUM PLASMA BATTERY technology I have found on the web. ENJOY! Oh what fun we are going to have in the future of flight!
http://www.ecocarforum.com/ev-forums...t_a_recha.html
''mad thorium batteries'' typed in Yahoo and/or Google brings up some great information about thorium plasma batteries.
Last edited by mad web tv scientist; 11-26-2013 at 07:53 PM.
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