Author Topic: Marquart Charger MA-5 Biplane Build  (Read 667 times)

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Offline dlabby

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Marquart Charger MA-5 Biplane Build
« on: September 18, 2018, 09:38:51 pm »
After 2-3 months of off and on research, I have chosen this one for my next build. Johnny Hunt had the plans and it looked like something I could do and it is similar to the Skybolt. This is a homebuilt; about 100 have been built. The Walt Moucha plans are 1/4 scale 73" span weighing in about 17 lb. Had trouble getting from plans to a CADD file for a laser cut kit. Lasercutusa made a short kit--very short, not much to it. I might as well have cut it out myself except for the numerous ribs. Got lots of parts ordered; just received a box of lumber from National balsa. I have made contact with Mark Gilmore who spent over 19 years building this one. It won EAA Grand Champion at Oshkosh in 2009. He has sent me a bunch of pictures to help with the build. Then picture of 'short kit' and the first gluing session tonight.
« Last Edit: September 18, 2018, 09:42:42 pm by dlabby »
Darrell Abby

Offline Lane C.

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Re: Marquart Charger MA-5 Biplane Build
« Reply #1 on: September 19, 2018, 08:44:59 am »
Looks like a big build - two wings! Keep us posted, Darrell. What engine?

Offline dlabby

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Re: Marquart Charger MA-5 Biplane Build
« Reply #2 on: September 19, 2018, 06:57:46 pm »
Not sure yet. 45 cc would be about right. I think 35 would not be very aerobatic. So looking at DA 50 or DLE 55 RA if I beef up the fire wall area.
Darrell Abby

Offline Joystick

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Re: Marquart Charger MA-5 Biplane Build
« Reply #3 on: September 19, 2018, 07:44:32 pm »
Not sure yet. 45 cc would be about right. I think 35 would not be very aerobatic. So looking at DA 50 or DLE 55 RA if I beef up the fire wall area.

My Coroplast biplane has two 72" wings, weighs 17 lbs and has good vertical on a DLE-35 with a 19x8 prop. It's also very aerobatic. You can try it out to see how it behaves for yourself.

If you add more power it would have unlimited vertical for sure.
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Offline dlabby

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Re: Marquart Charger MA-5 Biplane Build
« Reply #4 on: September 21, 2018, 08:53:25 am »
Well, great. I see your post after I order a DA-50 and Pitts wrap around muffler.
Darrell Abby

Offline Joystick

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Re: Marquart Charger MA-5 Biplane Build
« Reply #5 on: September 21, 2018, 10:15:30 am »
That will be perfect for 3-D flying, or Reno Air Races.

My plane will fly with two clicks of throttle. Scale speed at 1/4.

With a DA-50 you should be able to get perfect scale speed with the engine off.
« Last Edit: September 21, 2018, 10:18:23 am by Joystick »
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Offline Joystick

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Re: Marquart Charger MA-5 Biplane Build
« Reply #6 on: September 21, 2018, 04:36:53 pm »
Well, great. I see your post after I order a DA-50 and Pitts wrap around muffler.

On second thought, I think you will be okay with just a small change to the recommended prop.

According to my engineering TLAR math, if you go with a 20x1.5 prop, that pitch will keep the speed down nicely.

Of course, since it's not a standard size, you may need to carve it yourself.
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Signed: Steve Rogers (As far as you know)

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Offline dlabby

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Re: Marquart Charger MA-5 Biplane Build
« Reply #7 on: September 25, 2018, 02:41:07 pm »
Plugging along with wood cutting, sanding, and gluing. So far I have used only one former out of the "short kit", modified a couple and had to cut the rest from scratch. Got vertical fin and rudder formed up. Received a gorgeous DA 50 yesterday. After I get the wrap around muffler I can go back to the front end and figure out the firewall modifications. Look ma', we have a fuselage.

Darrell Abby

Offline dlabby

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Re: Marquart Charger MA-5 Biplane Build
« Reply #8 on: September 30, 2018, 04:08:24 pm »
This past week I got the horizontal stab and elevator made. Elevator is connected in the center but I think I will put still use 2 servos. Spent a lot of time adding the side stingers and sanding/ forming the fuse curvature and blending in to wing saddle. Got the custom 1/8" aluminum gear so added the mounting plywood in fuse. Still waiting on muffler so I can get back to firewall, etc. Pictures next time.
Darrell Abby

Offline Joystick

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Re: Marquart Charger MA-5 Biplane Build
« Reply #9 on: October 01, 2018, 07:57:28 am »
I don't understand why that plane should weigh 17 lbs. My Lazy Ace plane is about the same size and it's made from really heavy coroplast material with 3/4" pine ribs and yardstick spars.
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Offline dlabby

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Re: Marquart Charger MA-5 Biplane Build
« Reply #10 on: October 02, 2018, 10:23:45 am »
Duh...I don't know. Plans list it as 16.5 lb. It sure does look/feel light at this point. Got aluminum gear mounted. The wheel fiberglass pants are very roundish so going to have to modify to obtain a flat mounting spot. Waiting on the Robart 4" wheels/tires, too. Also have defective part in the tailwheel assembly. Just reminded myself so will go call right now.
Darrell Abby

Offline dlabby

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Re: Marquart Charger MA-5 Biplane Build
« Reply #11 on: October 08, 2018, 09:46:20 am »
I feel bad; this is weird. I swept the wood shavings on the shop floor and as I was scooping it up I found the collett (that goes in the steering arm) that fell out of the tail wheel packaging. This part is less than 1/4". MECOA was kind enough t send me one--now I have 2. If I hadn't called I would not have found it (Murphy's Corollary). Well I spent part of 4 days last week modifying the wheel pants so as to have a flat spot that mounts onto the aluminum gear. Hand made trial and error plywood/balsa pieces and Hi-solled them in. See pictures. Blind nuts on inside for the pants attachment bolts. In the end, I am happy with the gear and pants being vertical and in alignment with fuse longitudinal axis. Used bondo to smooth the add-on into the fiberglass pant. I used 6 oz cloth and Z-poxy to cover the mounting area; should be strong. Four inch Robart wheels/tires are nice; aluminum wheel with brass bushing will last a lot longer than cheap plastic wheels. Still no muffler so starting to lay up the bottom wing center section which is width of fuse; then from there, there is a 1 degree dihedral and wing sweep back, too. The kit cut ribs are not working; what a confusing mess. In addition the plans do not have any rib caps and I want to add them. And I don't like his dihedral ply brace so I am adding a 1/2" aluminum wing tube. He has no strength at all across the wing center section. I guess the box configuration of all the biplane cabanes is supposed to hold it all together.
« Last Edit: October 08, 2018, 09:53:06 am by dlabby »
Darrell Abby

Offline Joystick

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Re: Marquart Charger MA-5 Biplane Build
« Reply #12 on: October 11, 2018, 09:11:19 am »
I've used this to make cap strips so I don't need to cut down the ribs to make room for the thickness of the caps. It also irons on, I use my monokote trim iron, which makes it quick and easy.

https://www.lowes.com/pd/Actual-0-75-in-x-6-in-x-25-ft-Natural-Birch-Veneer-Edging/3603330

It is also good to reinforce joints without adding much weight. Just super glue it in place. It is easy to cut to shape with scissors or a knife and is fairly flexible.
CHECK SIX

Signed: Steve Rogers (As far as you know)

Nothing is foolproof to a sufficiently talented fool.

Offline dlabby

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Re: Marquart Charger MA-5 Biplane Build
« Reply #13 on: October 12, 2018, 01:51:48 pm »
OK, Steve, you must read my mind, please, and make these suggestions before I spend hours at work. What a great idea. I used this edging all the time when making furniture.
Darrell Abby

Offline Lane C.

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Re: Marquart Charger MA-5 Biplane Build
« Reply #14 on: October 12, 2018, 06:04:54 pm »
Darrell, looks like a builder's weekend! Rain Rain Rain! Oh well, there will be sunshine aplenty later on.