DLE 20 Header and Can
07-29-2011, 09:05 AM
#26
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RE: DLE 20 Header and Can
ORIGINAL: a1pcfixer
Equal to the stock unit? Less?
[/quote]
Around 500F, just a little lower than the stock muffler will see. Don't let the 11 oz weight hit fool you...you get considerable boost in power with the gizmo installed. Not as much as a pipe, but pipes cost double
You shouldn't have trouble with the coupler staying on if you use these garden hose clamps, except be careful not to overtighten or they will crush the ally. If the coupler blows off, use a couple button head screws on the pipe and header stems. I use 4-40 x 1/8", but 2-56 will work fine. You don't really need to tap the ally stems either...teflon holds them in fine and they, in turn, hold the teflon from blowing off
08-01-2011, 09:55 AM
#29
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RE: DLE 20 Header and Can
Righty Ho I measured the weights of the Stock muffle vs the Just Engines Header and Weston UK Mini pipe Aerobatic.
123gr vs 227gr. Only 104gr in it but thats still a bit more than ideal.
123gr vs 227gr. Only 104gr in it but thats still a bit more than ideal.
08-01-2011, 12:16 PM
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RE: DLE 20 Header and Can
ORIGINAL: TimBle
Righty Ho I measured the weights of the Stock muffle vs the Just Engines Header and Weston UK Mini pipe Aerobatic.
123gr vs 227gr. Only 104gr in it but thats still a bit more than ideal.
Righty Ho I measured the weights of the Stock muffle vs the Just Engines Header and Weston UK Mini pipe Aerobatic.
123gr vs 227gr. Only 104gr in it but thats still a bit more than ideal.
You must have gotten the heaviest one ever made!
Mine is only 2 ounces - yours is 3.94 ounces?
7.29 ounce/227gr for that header AND pipe?
Something isn't coming out right.
08-01-2011, 10:25 PM
#32
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RE: DLE 20 Header and Can
Oops sorry, Stock muffler is 56gr.
The whole assembly shown on the pic is 227gr. Header + Pipe + Silicone connector. So the delta is 169gr which is quite substantial.
Looking at ways to cut 169gr from the nose of the Spot On to compensate.
I tried a EG Aircraft Carbon spinner against the TWM spinner supplied with the plane 5gr delta to the good. SImply not enough. I need a lighter spinner nut but the DLE require a M8x1 thread while most of the spinner nuts are M8x1.25 metric thread.
A lighter engine mount would be great too but need to remove the current one to weigh it. Not sure I'm going to extract good savings there. I'm wondering if a Sullivan's stand off mount adaptor would net me some big savings over the current beam mount?
Replacing all the steel bolts holding the engine mount and the engine with aluminium bolts would chip away at the problem.
My last resort is to refit the stock muffler and use Foil laminated Extruded Polypropylene as a sound damper and heat shield. That way I can shape airflow across the DLE. Right now its looking like a viable option.
The whole assembly shown on the pic is 227gr. Header + Pipe + Silicone connector. So the delta is 169gr which is quite substantial.
Looking at ways to cut 169gr from the nose of the Spot On to compensate.
I tried a EG Aircraft Carbon spinner against the TWM spinner supplied with the plane 5gr delta to the good. SImply not enough. I need a lighter spinner nut but the DLE require a M8x1 thread while most of the spinner nuts are M8x1.25 metric thread.
A lighter engine mount would be great too but need to remove the current one to weigh it. Not sure I'm going to extract good savings there. I'm wondering if a Sullivan's stand off mount adaptor would net me some big savings over the current beam mount?
Replacing all the steel bolts holding the engine mount and the engine with aluminium bolts would chip away at the problem.
My last resort is to refit the stock muffler and use Foil laminated Extruded Polypropylene as a sound damper and heat shield. That way I can shape airflow across the DLE. Right now its looking like a viable option.
08-01-2011, 11:23 PM
#33
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RE: DLE 20 Header and Can
Don't overlook the fact that the header and mini pipe will be further back on the plane and closer to the CofG (in some cases on or extending behind it).
In terms of balancing the model, you will probably find you don't need to recover the whole 169gm from the nose to achieve correct balance.
But i agree an extra 169gm makes for a heavier airplane which will reduce overall flight performance and you could look at taking measures to reduce the weight.
Things like carbon gear, lighter wheels or an iBEC might help.
In terms of balancing the model, you will probably find you don't need to recover the whole 169gm from the nose to achieve correct balance.
But i agree an extra 169gm makes for a heavier airplane which will reduce overall flight performance and you could look at taking measures to reduce the weight.
Things like carbon gear, lighter wheels or an iBEC might help.
08-02-2011, 01:05 AM
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RE: DLE 20 Header and Can
ORIGINAL: TimBle
Oops sorry, Stock muffler is 56gr.
The whole assembly shown on the pic is 227gr. Header + Pipe + Silicone connector. So the delta is 169gr which is quite substantial.
Oops sorry, Stock muffler is 56gr.
The whole assembly shown on the pic is 227gr. Header + Pipe + Silicone connector. So the delta is 169gr which is quite substantial.
Looking at ways to cut 169gr from the nose of the Spot On to compensate.
http://www.valleyviewrc.com/estore/d...-prop-hub.html
[/quote]
08-02-2011, 01:11 AM
#35
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RE: DLE 20 Header and Can
The Cg of the Header/mini pipe assembly is ahead of the planes cg so that has moved forward. Holding it inverted requires more down elevator now than previously. For a Pattern plane this is a bit of a problem because I either need to adjust my style of move the CG aft. I am doing the latter but first prize is too loose the weight somewhere without rebuilding large parts of the iarframe out of carbon honeycomb sandwich.
I already have carbon gear and fairly light wheel sbut I can only shed about 4grams in total on this front.
An IBEC is going to require a bigger battery pack anyway since I am using digital servo's (Hyperion) and they are drawing more current than the ignition! Avergaging around 180mA per 10min flight from the airplane and only 100mA from the ignition. SO I need 300mA per flight with reasonable safety margin I should opt for a 3200mAHr LIFE. I am currently using 2x 1600mA.hr Flat pack LiFePO4 packs from Hyperion. So no real gain there. For balance I will move it rearward.
I could get away with a 2100mA.hr pack but I'd have to be more vigilent on the remaining capacity and that onl possible through removing the wing after each flight its a little non prefered right now.
Big win items are:
Engine mount (not sure but 50gr sounds reasonable)
Ditch the header/mini pipe and quiet the stock muffler. (-169gr)
Smaller win items:
Remove Dymond 8500 servo and replace with Futaba S3151 DIGITAL for throttle (-20Gr)
replace steel bolts with aluminium (- 20gr)
lighter wheels ( -6gr per pair)
Lighter wheels pants ( - 10gr per pair)
Lighter spinner ( -10gr)
Smaller diameter fuel tubing (-5gr)
Lighter clunks (-5gr)
= -76gr already (conservative estimate)
I already have carbon gear and fairly light wheel sbut I can only shed about 4grams in total on this front.
An IBEC is going to require a bigger battery pack anyway since I am using digital servo's (Hyperion) and they are drawing more current than the ignition! Avergaging around 180mA per 10min flight from the airplane and only 100mA from the ignition. SO I need 300mA per flight with reasonable safety margin I should opt for a 3200mAHr LIFE. I am currently using 2x 1600mA.hr Flat pack LiFePO4 packs from Hyperion. So no real gain there. For balance I will move it rearward.
I could get away with a 2100mA.hr pack but I'd have to be more vigilent on the remaining capacity and that onl possible through removing the wing after each flight its a little non prefered right now.
Big win items are:
Engine mount (not sure but 50gr sounds reasonable)
Ditch the header/mini pipe and quiet the stock muffler. (-169gr)
Smaller win items:
Remove Dymond 8500 servo and replace with Futaba S3151 DIGITAL for throttle (-20Gr)
replace steel bolts with aluminium (- 20gr)
lighter wheels ( -6gr per pair)
Lighter wheels pants ( - 10gr per pair)
Lighter spinner ( -10gr)
Smaller diameter fuel tubing (-5gr)
Lighter clunks (-5gr)
= -76gr already (conservative estimate)
08-02-2011, 01:14 AM
#36
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RE: DLE 20 Header and Can
ORIGINAL: a1pcfixer
That's only 5.4 ounces, not that bad.
Looking at ways to cut 169gr from the nose of the Spot On to compensate.
DLE 20cc Prop Hub (1.2 ounce)
http://www.valleyviewrc.com/estore/d...-prop-hub.html
ORIGINAL: TimBle
Oops sorry, Stock muffler is 56gr.
The whole assembly shown on the pic is 227gr. Header + Pipe + Silicone connector. So the delta is 169gr which is quite substantial.
Oops sorry, Stock muffler is 56gr.
The whole assembly shown on the pic is 227gr. Header + Pipe + Silicone connector. So the delta is 169gr which is quite substantial.
Looking at ways to cut 169gr from the nose of the Spot On to compensate.
http://www.valleyviewrc.com/estore/d...-prop-hub.html
Thanks for that. I do however require a prop hub with a M4 thread in front to allow the spinner to be screwed in place.
08-02-2011, 05:11 AM
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RE: DLE 20 Header and Can
ORIGINAL: TimBle
Thanks for that. I do however require a prop hub with a M4 thread in front to allow the spinner to be screwed in place.
ORIGINAL: a1pcfixer
DLE 20cc Prop Hub (1.2 ounce)
http://www.valleyviewrc.com/estore/d...-prop-hub.html
DLE 20cc Prop Hub (1.2 ounce)
http://www.valleyviewrc.com/estore/d...-prop-hub.html
09-30-2011, 05:58 PM
#39
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RE: DLE 20 Header and Can
If you watch the video and listen to him talk at the end ....he got the exhaust from Mile High rc
http://www.milehighrc.com/
http://www.milehighrc.com/
09-30-2011, 06:07 PM
#40
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RE: DLE 20 Header and Can
More accurately, it's here....
http://milehighrc.com/muffler.html
....lower left hand side of page 20-30cc
VVRC also sells the same item.
http://milehighrc.com/muffler.html
....lower left hand side of page 20-30cc
VVRC also sells the same item.
10-01-2011, 12:02 AM
#41
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RE: DLE 20 Header and Can
Okey dokey so I have experimented with a Hatori 821 pipe and it works a treat.
Its only 82gr so half the weigh of the Weston UK mini pipe.
I would recommend that for a gasser you look at a pipe that works for a glow engine of slightly higher displacement. The 1.20 pipe just seems to restrict the engine at WOT a little.
Neither is length sensitive.
Its only 82gr so half the weigh of the Weston UK mini pipe.
I would recommend that for a gasser you look at a pipe that works for a glow engine of slightly higher displacement. The 1.20 pipe just seems to restrict the engine at WOT a little.
Neither is length sensitive.
