Semi scale Mig-25 Foxbat, 70 mm - Page 7 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 02-06-2016, 07:10 PM   #61
Dutkoski
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Re: Semi scale Mig-25 Foxbat, 70 mm


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Redid the hinges on the opposite side, three pin hinges for the flaps and two pin hinges for the ailerons. Also, routed out the area for the two servos and I like to mount the control horns to plywood plates that are inset into the foam instead of drilling through the foam control surface and then sandwiching the foam. I don't like crushing the foam. The foam is roughed up and the plates are secured with lots of epoxy. I've never had one fail ...... At least not yet.

Now the flaps drop down fully and I have twice the aileron throw in both directions.

So, now to do the other side.
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Old 02-07-2016, 10:15 AM   #62
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Re: Semi scale Mig-25 Foxbat, 70 mm

Just a note that those flaps may blank out your Elevator when deployed
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Old 02-07-2016, 10:54 AM   #63
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Re: Semi scale Mig-25 Foxbat, 70 mm

Great minds think alike Ken, when I checked the deflection, I noticed it. I'm going to use the three settings on the switch to activate the flaps, on the test flight, I'll see how things react, when it's up high and finger on the switch just I case there's an issue.

The stab is really quite big, I hope there are no issues.
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Old 02-08-2016, 01:26 PM   #64
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Re: Semi scale Mig-25 Foxbat, 70 mm

What type of glue are you using for pink foam?
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Old 02-08-2016, 06:14 PM   #65
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Re: Semi scale Mig-25 Foxbat, 70 mm

For gluing in the hinges, or gluing the foam to each other, 5 minute epoxy. When I bond balsa to the foam, I use slight diluted carpenters wood glue. Reason is, it can be sanded and doesn't leave a big seam like epoxy. I sand the foam surface first though so the wood glue can penetrate and get a ver good bond.
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Old 02-08-2016, 06:21 PM   #66
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Re: Semi scale Mig-25 Foxbat, 70 mm

What brand of glue do you use? Is is a polyurethane type? Any link to the product?
I have a model that requires a lot of foam to foam glue joints and something that sands would be very useful. It is a Tetris model and is in sections from nose to tail like a loaf of bread.
Thanks Eric
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Old 02-08-2016, 06:28 PM   #67
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Re: Semi scale Mig-25 Foxbat, 70 mm

Well, I would recommend lepages carpenters glue, thin it down so you can use a brush ( I use the 1/2" acid brushes ) the glue on. Lightly block sand both surfaces with 120 grit sand paper. Brush on the glue on both surfaces but stay away from the outer edge. Bond the surfaces together, I would use weights to apply some pressure while the glue dries. The less glue that is at the outside edge the better. That way, when you sand, the foam coutures blend nicely.
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Old 02-08-2016, 06:29 PM   #68
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Re: Semi scale Mig-25 Foxbat, 70 mm

Thanks!
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Old 02-19-2016, 01:04 PM   #69
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Re: Semi scale Mig-25 Foxbat, 70 mm

Any update, I would really like to see the final product...

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Old 02-19-2016, 08:24 PM   #70
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Re: Semi scale Mig-25 Foxbat, 70 mm

Working on it tonight, taking it to the field tomorrow and get others to look at it and get some opinions.
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