Sport Twin Pics
07-11-2011, 02:34 PM
#26
RE: Sport Twin Pics
Here's another of our sport twins. The design was from both myself and Carl "Flaps" Laffert." He does most of the building and I do the flying. All-in-all, we did 25 twins.
This one he called KOLO, for King Of Left Overs. The wing is from a Corsair kit he was goven that turned out to be with wing kit only. We both came up with the twin book pusher-puller. The booms are Monokote covering tubes with 3 coats of epoxy resin. The other option was to roll plywood. The cardboard tubes worked well and we never had any trouble or failures from them. Essentially, the whole plane was made from left over parts, scrap balsa, hardware, tanks, etc.
The Kolo was a good flying plane. The power was 2 Magnum .52 4-strokes. We had the Maggies on 3 different and never had an engine failure until I ran one out of fuel (it doesn't count).
That's Flaps in the picture. He'll be 90 this year.
This one he called KOLO, for King Of Left Overs. The wing is from a Corsair kit he was goven that turned out to be with wing kit only. We both came up with the twin book pusher-puller. The booms are Monokote covering tubes with 3 coats of epoxy resin. The other option was to roll plywood. The cardboard tubes worked well and we never had any trouble or failures from them. Essentially, the whole plane was made from left over parts, scrap balsa, hardware, tanks, etc.
The Kolo was a good flying plane. The power was 2 Magnum .52 4-strokes. We had the Maggies on 3 different and never had an engine failure until I ran one out of fuel (it doesn't count).
That's Flaps in the picture. He'll be 90 this year.
07-11-2011, 03:02 PM
#27
RE: Sport Twin Pics
Here I am with another crazy design from Ed & Flaps. I called it the A-Frame.
Flaps had a couple of big dowels and I had this old RC combat foam wing. That sounds like the makings of a twin to me. At this point, he and I were turning out a twin about once a month. We went nuts over them for a while. We did learn an awful lot about them.
Flaps made the fuselage and the tail. 1/4" ply engine mounts for the Magnum .28XL 2-strokes. We both had old servos. I forget what the angles on the fuselage were. I kept telling him to go wider on the spacing, but he was getting worried.
I did the wing-cut holes for the rx & battery and taped them in. The servos were zip-tied on.
It doesn't look like much, but it flew pretty well and sure didn't cost much. The dowels weren't very stiff like carbon fiber tubes, but it's what we had. They would flex during taxi and at times in flight. I did all sorts of acro with the darn thing with no trouble.
If I had to do it again, I'd use carbon fiber tubes and build a box for the radio under the wing. I'd probably airfoil it like a Burnelli design. You can see out scale Burnelli CBY-3 in the scale twin thread.
Flaps had a couple of big dowels and I had this old RC combat foam wing. That sounds like the makings of a twin to me. At this point, he and I were turning out a twin about once a month. We went nuts over them for a while. We did learn an awful lot about them.
Flaps made the fuselage and the tail. 1/4" ply engine mounts for the Magnum .28XL 2-strokes. We both had old servos. I forget what the angles on the fuselage were. I kept telling him to go wider on the spacing, but he was getting worried.
I did the wing-cut holes for the rx & battery and taped them in. The servos were zip-tied on.
It doesn't look like much, but it flew pretty well and sure didn't cost much. The dowels weren't very stiff like carbon fiber tubes, but it's what we had. They would flex during taxi and at times in flight. I did all sorts of acro with the darn thing with no trouble.
If I had to do it again, I'd use carbon fiber tubes and build a box for the radio under the wing. I'd probably airfoil it like a Burnelli design. You can see out scale Burnelli CBY-3 in the scale twin thread.
07-11-2011, 04:58 PM
#28
Senior Member
Join Date: Nov 2002
Location: Lenox Township, Michigan
Posts: 818
Likes: 0
Received 0 Likes
on
0 Posts
RE: Sport Twin Pics
Just caught this thread. A lot of real nice builds going on here !
Do my ARF’s count ? Picked up the twin bug about ten years ago. Got six twins in my hanger...........3 are scale and 3 are sport.
1. Ten year old TwinStar powered with OS .26 4-strokes.
2. Dual Ace (aka Beechcraft Duke ??) powered with OS .52 4-strokes.
3. EFlite Deuces Wild, electric powered.
4. EFlite P-38, electric powered.
5. Hangar 9 UV-18 DeHavilland Twin Otter, electric powered.
6. TopFlite Cessna 310 powered with OS .91 4-strokes.
The ol’ lady, my TwinStar is now showing her age. The peel-and-stick covering is now loaded up with clear tape to keep her together.
The Dual Ace (aka Beechcraft Duke ??) is my favorite flying twin. Seems like I’m always taking her out to the field. A great flyer with very dependable OS engines !
The Cessna 310 sounds the best ! To me, nuthin’ sounds better than a pair of 4-strokers running in sync ! I’ve got a lot of bucks into her so my fear factor is high.
I must be getting’ older as I’m getting spoiled with the electric powered Deuces Wild, P-38 and Twin Otter. No gummy clean-up.......no stinky car.....just charge and fly !
Joe M.
Do my ARF’s count ? Picked up the twin bug about ten years ago. Got six twins in my hanger...........3 are scale and 3 are sport.
1. Ten year old TwinStar powered with OS .26 4-strokes.
2. Dual Ace (aka Beechcraft Duke ??) powered with OS .52 4-strokes.
3. EFlite Deuces Wild, electric powered.
4. EFlite P-38, electric powered.
5. Hangar 9 UV-18 DeHavilland Twin Otter, electric powered.
6. TopFlite Cessna 310 powered with OS .91 4-strokes.
The ol’ lady, my TwinStar is now showing her age. The peel-and-stick covering is now loaded up with clear tape to keep her together.
The Dual Ace (aka Beechcraft Duke ??) is my favorite flying twin. Seems like I’m always taking her out to the field. A great flyer with very dependable OS engines !
The Cessna 310 sounds the best ! To me, nuthin’ sounds better than a pair of 4-strokers running in sync ! I’ve got a lot of bucks into her so my fear factor is high.
I must be getting’ older as I’m getting spoiled with the electric powered Deuces Wild, P-38 and Twin Otter. No gummy clean-up.......no stinky car.....just charge and fly !
Joe M.
07-17-2011, 08:06 AM
#31
RE: Sport Twin Pics
This is a twin delta I made by widening a Diamond Dust delta kit. I named it the Dusty Deuce. Power is 2 OS .25FX engines with Jett mufflers. The test flights were with the stock mufflers and 9-6 MA props until I got a good feel of the plane. Then I installed the Jetts and 8-6 or 8-7 APC props.
All the servos except throttles are Hitech digitals. The radio is a JR 9303 using the built-in twin program.
We launch it from a PVC launcher on a table with the legs on one side folded. It's a pretty speedy little plane. Very easy to fly, but it can be hard to keep up with at a distance. The colors help. For takeoff, you hold a little up elevator and have someone pull the pin. It glides in on the grass very nicely for landing.
You might notice that the remote needle valve assemblies are not OS. I got tired of the cast-on assemblies breaking, so I cut these off and installed GMS .25 remote needles. There is no difference in how they work.
All the servos except throttles are Hitech digitals. The radio is a JR 9303 using the built-in twin program.
We launch it from a PVC launcher on a table with the legs on one side folded. It's a pretty speedy little plane. Very easy to fly, but it can be hard to keep up with at a distance. The colors help. For takeoff, you hold a little up elevator and have someone pull the pin. It glides in on the grass very nicely for landing.
You might notice that the remote needle valve assemblies are not OS. I got tired of the cast-on assemblies breaking, so I cut these off and installed GMS .25 remote needles. There is no difference in how they work.
07-17-2011, 08:32 AM
#32
RE: Sport Twin Pics
After Dusty got old, Flaps and I installed floats for a twin delta seaplane we call the Sea Delta.
The floats are some fiberglass ones I picked up. They have a flange where the top and bottom are joined. It causes a lot of water to be splashed upwards. The whole plane gets soaked on takeoff.
I pulled the higher priced OS .25FX with Jett mufflers and a pair of OS .46LA(10-6 props), plain bearing engines I had. They run well, same speed and don't use any more fuel. I think someone told me that the best .25 ever made was the OS .40LA. The floats don't seem to make much difference in how the plane flies. I didn't try a flat spin with the floats.
The picture where I have a big smile is after the test flight. Notice the plans is covered with water.
On the test flight landing, I hit something just under the water with the left float. It caused the plane to bounce to the right. After I taxied in I noticed the V-bottom of the float was dented in. That has been fixed.
The floats are some fiberglass ones I picked up. They have a flange where the top and bottom are joined. It causes a lot of water to be splashed upwards. The whole plane gets soaked on takeoff.
I pulled the higher priced OS .25FX with Jett mufflers and a pair of OS .46LA(10-6 props), plain bearing engines I had. They run well, same speed and don't use any more fuel. I think someone told me that the best .25 ever made was the OS .40LA. The floats don't seem to make much difference in how the plane flies. I didn't try a flat spin with the floats.
The picture where I have a big smile is after the test flight. Notice the plans is covered with water.
On the test flight landing, I hit something just under the water with the left float. It caused the plane to bounce to the right. After I taxied in I noticed the V-bottom of the float was dented in. That has been fixed.
01-08-2012, 07:12 AM
#33
Senior Member
Join Date: Jun 2009
Location: Douglassville,
PA
Posts: 311
Likes: 0
Received 0 Likes
on
0 Posts
RE: Sport Twin Pics
Hello All,
Just wanted to add my pics to the thread. Here are some pics of a twin I designed a few years back. This is my second twin and the first is a Cessna UC-78 Bobcat from RCM plans.
The Bobcat is currently awaiting new covering after stripping the old and having made a few repairs. I am also waiting for plans for a 70" twin Piper Commanche. Can't wait to see those!!!
I designed the nacelles as close to the fuse as possible to aid in keeping it in the air in case of an engine out situation and it has paid off more than once! I had a small video camera on the plane during a throttle servo failure and had to fly the thing at full bore until the fuel ran out.
Bobcat about 15 years ago. My first twin
Bobcat under repairs during the summer of 2011
Twin Engine Video.
[youtube]http://www.youtube.com/watch?v=HbdrSq4IKT4[/youtube]
Just wanted to add my pics to the thread. Here are some pics of a twin I designed a few years back. This is my second twin and the first is a Cessna UC-78 Bobcat from RCM plans.
The Bobcat is currently awaiting new covering after stripping the old and having made a few repairs. I am also waiting for plans for a 70" twin Piper Commanche. Can't wait to see those!!!
I designed the nacelles as close to the fuse as possible to aid in keeping it in the air in case of an engine out situation and it has paid off more than once! I had a small video camera on the plane during a throttle servo failure and had to fly the thing at full bore until the fuel ran out.
Bobcat about 15 years ago. My first twin
Bobcat under repairs during the summer of 2011
Twin Engine Video.
[youtube]http://www.youtube.com/watch?v=HbdrSq4IKT4[/youtube]
07-18-2013, 04:21 PM
#39
RE: Sport Twin Pics
I'm an engineer, so I ought to be precise, but I'm not. I use the main spar or a little behind it for the CG.
Most Sticks, even twins, with the power we normally use come out way nose heavy. My Twin Stick came out that way. As I recall, I used a separate servo mounted underneath in the far rear for the tail wheel and moved the battery to a compartment back near the tail. I get the feeling that most Sticks are designed to have the correct CG with an OS LA, not the heavier ball bearing .46-.55.
Most Sticks, even twins, with the power we normally use come out way nose heavy. My Twin Stick came out that way. As I recall, I used a separate servo mounted underneath in the far rear for the tail wheel and moved the battery to a compartment back near the tail. I get the feeling that most Sticks are designed to have the correct CG with an OS LA, not the heavier ball bearing .46-.55.
07-31-2013, 12:03 PM
#42
RE: Sport Twin Pics
Its a standard AMR RC kit. Its made for twin 30's but I live in Colorado at 5K feet so I beefed it up to handle the 55's. I sheeted the wing a few bays more than the plans called for and added wing struts to provide additional support. Its two years old now and has had many enjoyable flights. Considering building another on this Winter with two DLE35RA's and lighten the structure some. All the AMR RC kits are great, I've built several of their models. Jerry.
08-01-2013, 06:02 AM
#44
RE: Sport Twin Pics
Bill, they still produce it; http://www.amr-rc.com/index.php?path...enu=&langue=en
08-01-2013, 09:42 AM
#45
My Feedback: (4)
Join Date: Jan 2002
Location: Westhampton Beach,
NY
Posts: 860
Likes: 0
Received 0 Likes
on
0 Posts
RE: Sport Twin Pics
I think I did see that, but some how thought twin cylinders lol
Nice! Plug in wings are the way to go today.
maybe once i get my giant Nosen trainer in the air (same wing span though its a one piece wing!) and some time with a big bird and gas engines, i may give it a shot.
My Nosen Citabria is close to the same WS as well, but that has a three piece wing thankfully.
Thanks!
Bill S.
Nice! Plug in wings are the way to go today.
maybe once i get my giant Nosen trainer in the air (same wing span though its a one piece wing!) and some time with a big bird and gas engines, i may give it a shot.
My Nosen Citabria is close to the same WS as well, but that has a three piece wing thankfully.
Thanks!
Bill S.
