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RM3

Elite Veteran

Killeen, Texas - USA

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Very surprised with the results... enjoy

Watch at YouTube

showing a preference will only get you into trouble, 90% of everything is crap...

10-23-2016 02:36 AM
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rbort

rrProfessor

Franklin, MA - USA

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Video is private

Make it public please

What, your motor was better?? I won't be shocked...

-=>Raja.

MA 1005 H280, 4045 flts
Raptor 90 H300, 267 flts
Spectra 27 3DMax, 3123 flts
Whiplash V1 27 3DMax, 1297 flts
Whiplash V2 H300, 33 flts

10-23-2016 02:37 AM
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RM3

Elite Veteran

Killeen, Texas - USA

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fixed

showing a preference will only get you into trouble, 90% of everything is crap...

10-23-2016 02:48 AM
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rrProfessor

Franklin, MA - USA

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Like I expected

Just watched the video and pretty much what I thought you were going to see. Wally motors had high timing numbers, some people like those and think the engine runs better for high rpms, but I always felt that while you could run those high rpms in any engine in a helicopter in a hover as it only takes 1/3 throttle to hover at high rpms, in most cases you can't hold the rpms when the load it increased. You can confirm that in heli videos that you watch running high rpms.

You can see that your engine held the load better than the wally motor did.

Now try to switch carbs between yours and the Wally motor and repeat the test to see what happens, as diffrent carb model numbers do make a difference. You probably need to move the insulator as well with the carb, as with Hanson we had to modify the insulator to make the 643 carb work properly.

-=>Raja.

MA 1005 H280, 4045 flts
Raptor 90 H300, 267 flts
Spectra 27 3DMax, 3123 flts
Whiplash V1 27 3DMax, 1297 flts
Whiplash V2 H300, 33 flts

10-23-2016 03:15 AM
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RM3

Elite Veteran

Killeen, Texas - USA

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well I re-ran the experiment on the Hyper21 with a 643... it did worse. the most I could get out of it on a 14x6 was 11,000rpms. I then tried the 1048 I had on my engine and the results were dismal...it just ran poorly.

The wally motor it seems is runs best with the bore size and metering of the 811. It sounds as if its choking with the bigger carbs. Transition is bad too.

In the past when I tried the 811 on my engine, it just wasnt getting enough air. I tried everything with the 811, took the choke lever out, epoxy puttied the intake to the carb and reshaped for flow. This helped but very little. I tired velocity stacks and they made very little difference over the 10K range. then I tried the 643 and got much better results, then went to the 1048 "big bore" from Daves and it was much happier, transition was clean, throttle response better than the 643 and more stable at peak RPMs.

I now have to put all this away and get to doing a bunch of homework as well as get back to machining. lots to do. Hopefully next week will allow me to rebuild my STR-G22

showing a preference will only get you into trouble, 90% of everything is crap...

10-23-2016 06:51 PM
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rrProfessor

Franklin, MA - USA

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I never tried the 1048

However I did try the 257 on the heli motors and was not happy with it. The bore is just a little bit smaller on the 257 vs the 1048, but neither have a bulb which makes pull starting alot easier so I prefer the 990.

But when I ran the 257, I didn't think it ran as well or made as much power as the 990, so I scrapped that project. Maybe the 1048 is better, but I still would like to have a primer bulb.

-=>Raja.

MA 1005 H280, 4045 flts
Raptor 90 H300, 267 flts
Spectra 27 3DMax, 3123 flts
Whiplash V1 27 3DMax, 1297 flts
Whiplash V2 H300, 33 flts

10-23-2016 07:15 PM
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RM3

Elite Veteran

Killeen, Texas - USA

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Maybe the 1048 is better, but I still would like to have a primer bulb.
I think you can transfer the primer bulb portion over to a 1048 right? the part number description from daves says that this part (the white plastic part) is designed to fit WT style carbs... its self contained with check valves. Might be worth looking into that.

showing a preference will only get you into trouble, 90% of everything is crap...

10-23-2016 08:18 PM
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rrProfessor

Franklin, MA - USA

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Well

I found the 1107 carb there with the bulb, seems like the best idea though not sure how well it will perform. I'd try one if I can find one to borrow, not sure want to buy one and find out its not good.

-=>Raja.

MA 1005 H280, 4045 flts
Raptor 90 H300, 267 flts
Spectra 27 3DMax, 3123 flts
Whiplash V1 27 3DMax, 1297 flts
Whiplash V2 H300, 33 flts

10-23-2016 11:29 PM
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RM3

Elite Veteran

Killeen, Texas - USA

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well considering Ive spent upwards of $2000 just experimenting with Titanium parts, different hardening bearing steels, different carbs, different bearings, cylinder modifications, piston modifications, dozens of custom cranks, custom wrist pins, crank pins and even tooling I can understand the part about expense... But you cant know some things unless you spend sometimes, otherwise your stuck waiting on someone else to find out for you. In my case sometimes a crazy idea gets the better of me and my wallet feels the sting... so far all this effort has only gained me 1.8hp over a stock G200PU (g20) and many would think Im nuts.... Im begining to wonder if they were right.

showing a preference will only get you into trouble, 90% of everything is crap...

10-24-2016 06:42 AM
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kogibankole

Key Veteran

albuquerque/ibadan

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THATS A GOOD TEST

if you are to use this on an airplane it would haul ass

if im not blade bogging youll find me pack puffing

10-24-2016 07:34 AM
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OuttaControl

Veteran

Springfield, Missouri -United states

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G22

It's a screamer my friend! All that tinkering paid off!

Mine fall down, went BOOM!!

10-25-2016 05:47 PM
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Gearhead

rrMaster

Vt

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it's a Rev'er

RM, I am wondering if you had to richen up ether of the Idle Screws when running props ??

Jim
Buzz Buzz Buzz

10-25-2016 06:32 PM
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RM3

Elite Veteran

Killeen, Texas - USA

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On Wallys I had to adjust the high needle for each Prop tested... So I tried to show his in the best light possible.
On my "g22" the 1048 carb worked for all the props as tuned from the heli.

Wallys runs very well considering what it is. It is a ported 20cc engine, no other changes...its not a stroker motor like mine that adds exotic metals increased compression etc. His was designed to get the most from it in the 11K to 12K range is my best guess considering the prop results. A stock 20 would likely give its best in the 8K range as the engine was designed for airplane use to begin with.
If I wanted to run say a 15x7 on a wally motor for a plank, my guess is that I would have to re-adjust the 811 carb to get the most out of that particular setup.

Mine on the other hand I spent alot of time trying to get the most power over the 12K mark which allows me to run a lower gear ratio and get the most torque from the engine. But I paid a heavy price for that performance as the modification cost is well over what Wally or even Hanson have done to their 20cc engine selection.

Can anybody confirm what carb the Hyper21 came with?... the testing showed that the 811 on this one is optimal...anything bigger just didnt work.

showing a preference will only get you into trouble, 90% of everything is crap...

10-25-2016 07:08 PM
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Scorpion Power ProModeler
Gearhead

rrMaster

Vt

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I don't see my mod'ed Hanson 20 turning a 16X6 to 8600 with a plane muffler. as I was told it would, some day I will test it, but I will have to see it happen before I believe it will

Jim
Buzz Buzz Buzz

10-27-2016 03:04 AM
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