Semi scale Mig-25 Foxbat, 70 mm - Page 11 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 09-10-2016, 11:44 PM   #101
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Re: Semi scale Mig-25 Foxbat, 70 mm


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hi John,

wow that Foxbat is very sharp looking! I am sure that it will fly great. Looking forward to seeing video of it flying.

Cheers
Brent
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Old 09-11-2016, 07:42 AM   #102
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Re: Semi scale Mig-25 Foxbat, 70 mm

John, your Foxbat does look terriffic!- best of luck with the maiden.
I see your Haoye Hornet in the backround, I think it's whispering "fly me too".
Tom
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Old 09-11-2016, 09:16 AM   #103
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Re: Semi scale Mig-25 Foxbat, 70 mm

Hi John

OMG that's going to be hard to see in the sky! better fly it very close
Love the Mig a great build John

You going to Chathum? Sept 22-25

Cheers
Ken
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Old 09-11-2016, 11:29 AM   #104
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Re: Semi scale Mig-25 Foxbat, 70 mm

You might be right Ken, but the dark camo schemes would cause me problems as well. Figure the manouvers will be simple, fast flyby turn around and do it again. What could possibly go wrong

I would still like to build a big one out of foam, twin 90's would great good. And keep it as uncomplicated as pissible. I ordered the Sea Vixen plans, if they don't work out as planned, then it just might be my next foam project.
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Old 09-11-2016, 08:55 PM   #105
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Re: Semi scale Mig-25 Foxbat, 70 mm

Did some quick figuring for a big twin, length works out to be 120", wingspan is about 70" without the missile rails factored in, the fuse will be 18" wide and just over 8" deep. This is just doubling the size of the 70 mm plane.........that's a lot of foam.....

Might make it somewhat smaller, at that length, I would need to make it so I can transport it in two fuse sections. But big is beautiful ...... plus, I have pretty much everything sitting the workshop except the retracts and Hobby King has those inexpensive electric ones. I know I can build the airframe for under $300.00.

The big Mig-15 flies pretty good on one 90 mm and 2100 watts, figure I'd use the Hoaye EDF units ( I still have a couple of dozen ) and the Mega motors ( I still have a few of those as well ) as they produce 2250 watts on a seven cell setup, so a combinned 4500 watts should fly the beast if kept as light as possible.

The best part is, the main fuse is a simple box with cured bottom edges, real easy to make. I do like this scheme.
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Old 09-21-2016, 08:56 PM   #106
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Re: Semi scale Mig-25 Foxbat, 70 mm

Going to use these line drawings to make the bigger one if it's a go. They are quite detailed and have lots of crossections to make templates.
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Old 09-21-2016, 08:57 PM   #107
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Re: Semi scale Mig-25 Foxbat, 70 mm

Number two drawing
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Old 09-21-2016, 09:01 PM   #108
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Re: Semi scale Mig-25 Foxbat, 70 mm

Number three drawing, there's a forth, but you get the idea. These are all on the internet so I can simply download, import into Corell Draw, enlarge to a good size and take them to Paragon to get them really enlarged.
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Old 09-22-2016, 07:10 AM   #109
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Re: Semi scale Mig-25 Foxbat, 70 mm

Did some calculations and Corel draw doodling, came up with a dimenision, over all length 98", wingspan 64", fusealage thickness 8 1/4". Wing root is 25.5" with the wing tip being 9", wing panel span of 24". Fuselage width is 13 3/4" at where the EDF's might be mounted just back of the main landing gear.

Edf's are 3.5" each plus 1" for tge mounting tabs, thats 9" plus 1" foam sides before shaping, that now 12", so will have 1.75" of free space, not much really.

Any comments....
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Old 09-23-2016, 04:52 AM   #110
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Re: Semi scale Mig-25 Foxbat, 70 mm

Printed out the fuselage cross section where the twin EDF's would most likely be mounted and position the units. There seems to be plenty of clearance around the fans to make this work. I will print out the wing layout and calculate the wing area so I might have an idea of the estimated wingloading in oz per square inch. The lighter the better.

After this, I'll start a new build thread as I'm pretty sure this is going ahead.

This is going to be interesting as it will involve all our building methods using foam, fiberglass, plastic and wood. Also, speed, once the parts are made. It seems no one likes to get involved in full winter building projects these days, so simplicity will be the driving force.

I happened to stumble onto a build thread from a chap in Brazil, he designed a Super Habu for a 120 mm EDF, it's made from rolled depron and hot wire cut foam wings, covered in 2 oz fiberglass ( I think ). Quite a nice job. The Mig will follow that covering method, no balsa sheeting. Here's the link to that video, https://youtu.be/Nqh8neal6T8
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