Td .051 powered speedster
12-06-2020, 12:53 PM
#76
I like your designs..! What do you use for an elevator push rod..?
Here is today's effort with the Fiberglass plane. This plane is basically the same size as the 1st plane that is mostly wood...but the fiberglass plane is much more narrow in the front view.
I think it looks pretty fast in the video, but who knows how fast the wind was blowing. The crankcase broke on this flight, so I called it quits with 1 video "in the can".
Here is today's effort with the Fiberglass plane. This plane is basically the same size as the 1st plane that is mostly wood...but the fiberglass plane is much more narrow in the front view.
I think it looks pretty fast in the video, but who knows how fast the wind was blowing. The crankcase broke on this flight, so I called it quits with 1 video "in the can".
Last edited by combatpigg; 12-06-2020 at 04:13 PM.
12-06-2020, 01:24 PM
#77
You need to set it to public viewing can't see the vid / blank screen unless your the owner.
What was the estimated wind speed and where did the case break?
I use small dia. hard plastic tube with small dia. piano wire.
Short elevator horn not exceeding the bottom of the fuselage.
Last edited by Pond Skipper; 12-06-2020 at 02:09 PM.
12-06-2020, 06:56 PM
#82
During start up it sounded like the following,
Pressure bladder and big e starter = loaded cylinder?
bent conrod, loose socket, snapped crank scenarios.
What will it take to fix your 1/2A hornet starter new cord?
Cone centers better etc.
Broke case bent prop during start up with the big cone / vibrations?
Yellow bird has a good running engine 24,386 rpm static / peak 28,680 rpm peak 107PS / static 94w / 92.3 pitch speed / 8.11oz thrust per thrust calc.
Modified blue 23,901 rpm static and peak 26,647 rpm 101ps. - static 89w / 90.5ps / 7.8oz
I see where the wind is coming from you are in a pinch yep, between trees and power line for good down wind passes.
So flight pattern had you flying into the wind over the field the doing turns in front of the camera rather than passes.
Yellow floats in easy enough / Blue had to do a down wind into a cross wind but certainly was slow enough.
Lower weights certainly are showing just a matter of doing straight line past the cam rather than turns to get some
ground speed results.
Few moments to analyze but the good straight lines where heading more so into the wind.
Pressure bladder and big e starter = loaded cylinder?
bent conrod, loose socket, snapped crank scenarios.
What will it take to fix your 1/2A hornet starter new cord?
Cone centers better etc.
Broke case bent prop during start up with the big cone / vibrations?
Yellow bird has a good running engine 24,386 rpm static / peak 28,680 rpm peak 107PS / static 94w / 92.3 pitch speed / 8.11oz thrust per thrust calc.
Modified blue 23,901 rpm static and peak 26,647 rpm 101ps. - static 89w / 90.5ps / 7.8oz
I see where the wind is coming from you are in a pinch yep, between trees and power line for good down wind passes.
So flight pattern had you flying into the wind over the field the doing turns in front of the camera rather than passes.
Yellow floats in easy enough / Blue had to do a down wind into a cross wind but certainly was slow enough.
Lower weights certainly are showing just a matter of doing straight line past the cam rather than turns to get some
ground speed results.
Few moments to analyze but the good straight lines where heading more so into the wind.
Last edited by Pond Skipper; 12-06-2020 at 07:48 PM.
12-06-2020, 07:47 PM
#83
During start up it sounded like the following,
Pressure bladder and big e starter = loaded cylinder?
bent conrod, loose socket, snapped crank scenarios.
What will it take to fix your 1/2A hornet starter new cord?
Cone centers better etc.
Broke case bent prop during start up with the big cone / vibrations?
Yellow bird has a good running engine 24,386 rpm static / peak 28,680 rpm peak
Modified blue 23,901 rpm static and peak 26,647 rpm.
I see where the wind is coming from you are in a pinch yep, between trees and power line for good down wind passes.
So flight pattern had you flying into the wind over the field the doing turns in front of the camera rather than passes.
Yellow floats in easy enough / Blue had to do a down wind into a cross wind but certainly was slow enough.
Pressure bladder and big e starter = loaded cylinder?
bent conrod, loose socket, snapped crank scenarios.
What will it take to fix your 1/2A hornet starter new cord?
Cone centers better etc.
Broke case bent prop during start up with the big cone / vibrations?
Yellow bird has a good running engine 24,386 rpm static / peak 28,680 rpm peak
Modified blue 23,901 rpm static and peak 26,647 rpm.
I see where the wind is coming from you are in a pinch yep, between trees and power line for good down wind passes.
So flight pattern had you flying into the wind over the field the doing turns in front of the camera rather than passes.
Yellow floats in easy enough / Blue had to do a down wind into a cross wind but certainly was slow enough.
Before I go back out will try some fresh fuel, bladder and glow plug and make sure the engine is singing. I spiked my current batch of fuel with a shot of the 66% boat fuel after getting home from another mediocre outing.
My Hornet starter needs to be looked at. I am told they use a standard Can Motor.
12-06-2020, 09:18 PM
#84
Yes I bought a spare one to insure a life time of on tap 1/2A starting.
The motor is a brushed 05 can perhaps up to 700 size
I have a 900 quite the beast for brushed built a plane for it using
D cell nicads back in the day 8 cell. Flew well with 4500mah at that time.
Swang a 9x5 prop as I recall.
The flight path needs to be sorted out flying a straight line past the cam needs
straight line build up speed for a shot at 100 doppler and beyond.
The motor is a brushed 05 can perhaps up to 700 size
I have a 900 quite the beast for brushed built a plane for it using
D cell nicads back in the day 8 cell. Flew well with 4500mah at that time.
Swang a 9x5 prop as I recall.
The flight path needs to be sorted out flying a straight line past the cam needs
straight line build up speed for a shot at 100 doppler and beyond.
12-07-2020, 10:09 AM
#85
Some time this week I should be flying at the Club Field [[[where I don't need to trespass to get a flight in]]]
The trouble there is the Club Safety Officer will probably say we aren't supposed to be flying 100 MPH passes straight over our heads. The AMA has in the basic safety rules words to the effect that pilots stay behind the runway at Pilot Stations.
If so, I would station the video cam on a stool out in the field.
The Hornet Starter motor had been so abused that the motor spun several times in it's ,mount,. twisting the motor leads so tight that they shorted out The motor is arcing,but still has some torque. The trick will be to find a new motor that the starter cone will press right onto.
The trouble there is the Club Safety Officer will probably say we aren't supposed to be flying 100 MPH passes straight over our heads. The AMA has in the basic safety rules words to the effect that pilots stay behind the runway at Pilot Stations.
If so, I would station the video cam on a stool out in the field.
The Hornet Starter motor had been so abused that the motor spun several times in it's ,mount,. twisting the motor leads so tight that they shorted out The motor is arcing,but still has some torque. The trick will be to find a new motor that the starter cone will press right onto.
12-07-2020, 11:18 AM
#87
2.99 replacement starter cone for the hornet starter
https://www.ebay.com/itm/REPLACEMENT...oAAOSwy45fXTWa
I flip them around and use thick hose through the hole suitable for the small spinners on 1/2A's
New starter would be my choice if the mounts are trashed and the frame is beat up
https://www.ebay.com/itm/S598-Sulliv...8AAOSwR7lavU2m
They are becoming rare and the price went up across the board on these was 39.95 now 49.95
https://www.ebay.com/itm/REPLACEMENT...oAAOSwy45fXTWa
I flip them around and use thick hose through the hole suitable for the small spinners on 1/2A's
New starter would be my choice if the mounts are trashed and the frame is beat up
https://www.ebay.com/itm/S598-Sulliv...8AAOSwR7lavU2m
They are becoming rare and the price went up across the board on these was 39.95 now 49.95
12-07-2020, 11:30 AM
#88
Modern 4k sports cam mounted to your hat will give you good vid from the pilot station.
They are cheap come with a remote to start stop and can be paired with your cell phone
to check position on the hat via the phone screen. Cheap now under 50 bucks
Fixed camera vids suck for enjoying the flight but would get a read.
They are cheap come with a remote to start stop and can be paired with your cell phone
to check position on the hat via the phone screen. Cheap now under 50 bucks
Fixed camera vids suck for enjoying the flight but would get a read.
Last edited by Pond Skipper; 12-07-2020 at 11:39 AM.
12-07-2020, 12:27 PM
#89
Modern 4k sports cam mounted to your hat will give you good vid from the pilot station.
They are cheap come with a remote to start stop and can be paired with your cell phone
to check position on the hat via the phone screen. Cheap now under 50 bucks
Fixed camera vids suck for enjoying the flight but would get a read.
They are cheap come with a remote to start stop and can be paired with your cell phone
to check position on the hat via the phone screen. Cheap now under 50 bucks
Fixed camera vids suck for enjoying the flight but would get a read.
Thanks for hooking me up with the motor and the starter cone stuff. It looks like the Hornet starter used GOOP to help keep the motor from spinning inside the plastic housing..
12-07-2020, 05:07 PM
#91
That must be a "late model" Hornet then.
The reason for the last flight with the Blue Plane petering out was a bad glow plug seal.and worn out bladder.
I spent time today running that engine with varying amounts of heads shims on 30% nitro. I reached a point where I could raise the head quite a lot [from where I had it with lower nitro] and not see any drop off in RPM. This engine runs steady with a 4.2 x 4 at 23,900. The extra nitro didn't gain much, but it started much easier today.
Not a great engine, but good enough to evaluate air frame mods with.
I also threw together another "Junk Yard TD" from loose parts but used a brand new P/L set from Cox International. I am breaking it in with a stack of head shims, 4.2 x 4 prop and so far this engine is sounding real good. This might be the best replacement P/L set I've ever seen.
The tach will tell the story tomorrow
The reason for the last flight with the Blue Plane petering out was a bad glow plug seal.and worn out bladder.
I spent time today running that engine with varying amounts of heads shims on 30% nitro. I reached a point where I could raise the head quite a lot [from where I had it with lower nitro] and not see any drop off in RPM. This engine runs steady with a 4.2 x 4 at 23,900. The extra nitro didn't gain much, but it started much easier today.
Not a great engine, but good enough to evaluate air frame mods with.
I also threw together another "Junk Yard TD" from loose parts but used a brand new P/L set from Cox International. I am breaking it in with a stack of head shims, 4.2 x 4 prop and so far this engine is sounding real good. This might be the best replacement P/L set I've ever seen.
The tach will tell the story tomorrow
12-07-2020, 09:12 PM
#92
The modified blue plane was zipping around at first, certainly can go faster with a cut down 4.75x4.75E to 4.3x4.75N with back cut.
Gains a bit more thrust which the plane could use thinner airfoil will hold it's own. Just once you load up for speed requires flying
with some build up time around 100ft. of ground speed build up to apex the gains in front of the camera.The wing tips are slowing it
down, the angle cut extends leading edge drag. Long CL style horizontal stab is robbing speed but does make it fun to yank and bank.
Gains a bit more thrust which the plane could use thinner airfoil will hold it's own. Just once you load up for speed requires flying
with some build up time around 100ft. of ground speed build up to apex the gains in front of the camera.The wing tips are slowing it
down, the angle cut extends leading edge drag. Long CL style horizontal stab is robbing speed but does make it fun to yank and bank.
Last edited by Pond Skipper; 12-07-2020 at 11:14 PM.
12-09-2020, 10:59 AM
#97
The fastest TD plane will need to be a toothpick around 65 -70sq."
2-3ch / 6.5oz - 7oz tops. not as fun to launch but the low wing stays clear of the pipe.
2-3ch / 6.5oz - 7oz tops. not as fun to launch but the low wing stays clear of the pipe.
Last edited by Pond Skipper; 12-09-2020 at 11:16 AM.
12-09-2020, 12:29 PM
#98
I think having your thrust line as close as possible to the wing is the most balanced design
I am curious to see how well the 4.5 pitch prop performs. I bought various size props for a G&Z 1cc Speed project and found that the G&Z couldn't handle anything more than a 4.2 x 4. So, I ended up with a few props from Steve Wilk that I never bothered trying.
I am curious to see how well the 4.5 pitch prop performs. I bought various size props for a G&Z 1cc Speed project and found that the G&Z couldn't handle anything more than a 4.2 x 4. So, I ended up with a few props from Steve Wilk that I never bothered trying.
12-09-2020, 02:50 PM
#99
Yes agreed, task at hand per drawing is to minimize overall size.
Skorch I, II and III on a pipes took a bit to get use to with the wing down low during launch.
est. 33k ish unloaded to 130 mph PS These are getting rare to see running just try doing a search on Youtube for a G&Z engine... nada.
Stock tuned pipe that came with the engine, speed spinner removed for a typical smaller dia. bullet spinner. 25% nitro / 20% castor.
Added the RC carb.
Skorch I, II and III on a pipes took a bit to get use to with the wing down low during launch.
G&Z .049N
Stock test with APC 4.5x4 / 98 mph pitch speed / 25.84K rpm 12.4oz thrust / .203hp - 152w / will get on the pipe once launch.est. 33k ish unloaded to 130 mph PS These are getting rare to see running just try doing a search on Youtube for a G&Z engine... nada.
Stock tuned pipe that came with the engine, speed spinner removed for a typical smaller dia. bullet spinner. 25% nitro / 20% castor.
Added the RC carb.
12-09-2020, 04:49 PM
#100
That must be the Sport Timed engine and it is doing a good job there.
The one I had was the FAI version with "High Timing". I think it was set at more than 180 degrees. Bill Hughes had used it himself so it was a screamer when I bought it from him..
The one I had was the FAI version with "High Timing". I think it was set at more than 180 degrees. Bill Hughes had used it himself so it was a screamer when I bought it from him..