Semi scale Mig-25 Foxbat, 70 mm - Page 2 - RCCanada - Canada Radio Controlled Hobby Forum
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Old 01-20-2016, 05:45 PM   #11
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Re: Semi scale Mig-25 Foxbat, 70 mm


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Will you be ducting the air intakes into the motor or just leave the insides as is?
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Old 01-20-2016, 07:14 PM   #12
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Re: Semi scale Mig-25 Foxbat, 70 mm

Haven't decided yet, but any ducting will be simplistic in nature, basically just sheet foam glued in place. I have my hot wire equipment with me so I might make a foam bell mouth to match up with the straight foam. That's very easy to do.
But I have to shape the fuse first and the forward section then glue them together before I cut open the top of the fuselage to make a access hatch which will be pretty big. I hate tiny hatches that you can't get your hand in.
The thrust tube will be Bristol card board, the white sheets from the dollar store and I have lots so why not.
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Old 01-21-2016, 06:55 AM   #13
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Re: Semi scale Mig-25 Foxbat, 70 mm

Hi John

Very Nice Project!!!

My 2 cents on EDF observations of late is almost everyone is putting some sort of intake vents within a few inches of the fan to help with air flow at low speeds or high Alpha for designs with long scale intakes

Love the size of the plane & love a model that fits in my T-Matrix
4S-6S sized is the way to go
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Old 01-21-2016, 08:34 AM   #14
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Re: Semi scale Mig-25 Foxbat, 70 mm

Hi Ken, how's it going. I was unaware of this, I will keep it in mind when I design the interior to be sure I have space in the "floor" in front to cut a cheater hole. The intakes are twice as large as the ones for the Habu, I anticipate no real problems though.

Many years ago, when cheater holes were in most DF models, particularly the old Byron models which all had large cheater holes, it actually affected high speed performance in a negative way. At low speed of course, it provided a lot of airflow for take offs.
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Old 01-21-2016, 09:53 AM   #15
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Re: Semi scale Mig-25 Foxbat, 70 mm

How's it going?

I've made the decission to pull the pin with Fed-Gov job with DND and release by June 1st of this year! 35 years combined service with DND is enough - Also working on first Turbine - I put a P20 in Sebart Advanti mini. Helping make "Ottawa Valley Jets" @ Carp Airport on Saturday July 2nd the most fun you can have I like to keep busy! Hope you can attend Event is mixed EDF/Turbine





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Originally Posted by Dutkoski View Post
Hi Ken, how's it going. I was unaware of this, I will keep it in mind when I design the interior to be sure I have space in the "floor" in front to cut a cheater hole. The intakes are twice as large as the ones for the Habu, I anticipate no real problems though.

Many years ago, when cheater holes were in most DF models, particularly the old Byron models which all had large cheater holes, it actually affected high speed performance in a negative way. At low speed of course, it provided a lot of airflow for take offs.
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Old 01-21-2016, 05:49 PM   #16
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Re: Semi scale Mig-25 Foxbat, 70 mm

Hey Ken, what happened to last years venue at Iroquois, too small?
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Old 01-21-2016, 07:27 PM   #17
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Re: Semi scale Mig-25 Foxbat, 70 mm

I cannot believe how fast HK sent my order, I ordered and paid for it on the 18th in the evening and was almost immediately notified that the order has be packaged up and shortly afterwards got the email that it was on the way. Today, at 5:00 p.m., when I got home, there was the package, that's about three days in actual time.

Anyway, I had doubled my order as the retracts were the least expensive ones they had and I had seen on some reviews that they sometimes don't work. Well, to my surprise, all 6 retracts worked beautifully. Cycled them all 6 or 7 times. Positive lock in the down position, seemed very smooth, has the metal trunion. Also like the fact you can reposition the mounting plates to the top of the retract unit and it's a machine thread with moulded in brass inserts in the retract itself.

The steering arm on the nose gear is pretty big, I might trim it down, but it will give plenty of leverage.

The oleo's I ordered fit perfectly as well, not much room left between the strut and the retract motor, but it doesn't bind at all.

Mains retract pair is $16.40 USD, part number is 225000018 and steerable nose gear retract is $9.99 USD, part number 225000017
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Old 01-21-2016, 10:49 PM   #18
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Re: Semi scale Mig-25 Foxbat, 70 mm

Attached the struts and wheels and set then up to test, cycled them about 5 times, seemed to work the same as when there was no load on them.

Here's a short video

http://youtu.be/dY2JcX4YzoI
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Old 01-22-2016, 03:00 AM   #19
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Re: Semi scale Mig-25 Foxbat, 70 mm

After an evening of redesigning the forward fuselage section got made and roughly sanded to shape. So far, the fuse and wings, tips the scales at 16.7 oz.. I figure the bare airframe should be around 20 to 22 oz before finishing.
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Old 01-22-2016, 05:06 AM   #20
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Re: Semi scale Mig-25 Foxbat, 70 mm

The HK servoless retracts have served us well and fly in most all of our models except the Lander T33 (and I wish we had used the HK type due to their inferior quality ).
The retracts do have threaded holes to mount plates on either side but they are not the same plates. You will have to fabricate new ones.
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