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HelicopterGasser Model RC HelicoptersOther › Stratus from min air
01-11-2011 10:29 PM  7 years agoPost 21
dre4473

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Clarksburg WVa

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Stratus

Man that sounds great...I am on hold on the stratus for a bit till I get a few more things I need to do the conversion..I found a company that carries the graphite for the new plate and the price is pretty good too so I wil be making one from scratch..As I get the peice I will post build pics and step by step info for anyone wanting to go with this setup!! have a good one guys and keep flyin!!

Donald R. Edwards JR Fly it like you stole it!!!

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05-12-2011 05:13 PM  6 years agoPost 22
express

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USA

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Did anyone do the conversion?

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05-12-2011 05:25 PM  6 years agoPost 23
Carey Shurley

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Orlando, FL - USA

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HB has now released the Spark Stratus version which is a direct conversion for the stratus. You need only to buy a Spectra frame ladder from MA to convert it, and the conversion itself is simple.

now gear ratios are a different story. The stratus originally had options for 8.45, 8.18, 7.91 and 7.75. other ratios are possible but require drilling holes or enlarging the existing ones.

the spark stratus conversion doesn't change the gear ratio so you'll either have to keep the head speed at an engine manageable RPM, get a motor that can deal with very high rpm or change the gear ratio.

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05-12-2011 05:40 PM  6 years agoPost 24
bwarkent

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Houston Tx

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I did design a baseplate and throttle servo mount and had Miniature machine it for me. I basically modified the spectra baseplate to lineup with the stratus frame. Unlike the hb conversion, the spectra baseplate is setup for the PUH motor. Unless you had the parts on hand, to go the route I went you would have to buy the fan/shroud in addition to the custom parts from miniature. All in all, it comes out about the same price as the hb conversion.

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05-12-2011 05:47 PM  6 years agoPost 25
express

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USA

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231PUH

I did more research. My findings: I want to use a 231PUH. However, when the motor is positioned on the frames it is a bit too tall and the frames interfere. My assumption, this conversion will only work with the RC style motors.

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05-12-2011 06:03 PM  6 years agoPost 26
bwarkent

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Houston Tx

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I had to put carbon spacers under the ladders to achieve the proper clearance for PUH motor.

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05-12-2011 06:07 PM  6 years agoPost 27
express

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USA

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Is there a possibility you would post a photo of the addition?

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05-12-2011 06:20 PM  6 years agoPost 28
bwarkent

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Houston Tx

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I'll take some pictures tonight.

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05-12-2011 10:10 PM  6 years agoPost 29
dre4473

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Clarksburg WVa

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I have a Question ??

My Question is how will the electronics stand up to the extra heat that will be caught under the canopy?? The RC engine puts the heat from its self into the canopy..Not out the bottom like the puh engines do with the fan shroud..This to me is a major problem and may cause pre-mature failure of the servos and such..

If you look at other heli designs that use this set up of engine they utilize the engine forcing air out the bottom and use belts to transfer the power to the shafts..vario, airstar...

Donald R. Edwards JR Fly it like you stole it!!!

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05-13-2011 01:12 AM  6 years agoPost 30
bwarkent

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Houston Tx

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New pics in gallery. The only thing I am not sure about is the spark plug clearance.

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05-13-2011 01:30 AM  6 years agoPost 31
Carey Shurley

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Orlando, FL - USA

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My Question is how will the electronics stand up to the extra heat that will be caught under the canopy??
depends on which way the motor is facing as to whether this matters.

If the motor is turned forward this is more likely to be an issue unless you make sure the canopy is cut away from where the air exits the cylinder shroud. Even with that extended backwards flight can get a lot of hot air in there.

with the engine facing backwards this is less of an issue because the hot air is usually exiting well behind the canopy.

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05-13-2011 01:37 AM  6 years agoPost 32
bwarkent

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Houston Tx

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Carey, can you explain why the difference in spark plug access between this conversion and the HB conversion? I have one of the newer large bore RC 4 bolt heads and I measured the height and compared to the PUH head and it is exactly the same. Does the 2 bolt head that is shown on the hb conversion have a larger boss for the spark plug to thread into thus bringing the plug closer to the ladder?

Don, in regards to:

"If you look at other heli designs that use this set up of engine they utilize the engine forcing air out the bottom "

Miniature Aircraft makes the Spectra G - Their gas version heli. The spectra G uses a PUH motor and and fan exactly as being done here.

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05-13-2011 01:41 AM  6 years agoPost 33
Carey Shurley

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Orlando, FL - USA

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In the HB Spark conversions (either Spectra or Stratus) the only thing that moves the engine closer or farther from the frame ladders is the gear ratio.

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05-13-2011 01:45 AM  6 years agoPost 34
bwarkent

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Houston Tx

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The clearance I have here is with a 14T pinion and 90 Main - 6.4 Gear ratio.

avi8er if you read this thread, the parts you guys machined fit perfectly!

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05-13-2011 03:28 AM  6 years agoPost 35
dre4473

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Clarksburg WVa

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stratus conversion..

Yes, I know min air makes the spectra G..I have one..I think every one is missing the Question..The RC type engines deflect air up towards the end if the crank that comes out the back of the engine as the same in a weedeater..This then puts the hot blown air in to the canopy no matter how the engine is facing..I dont want to have half my canopy cut away to get rid of this heat..Thats the point!!

My original post was about putting a PUH engine in the stratus..I will have to pass on this RC engine design..Servos cost way too much and RX's dont take well to heat at 200 plus degree!

Donald R. Edwards JR Fly it like you stole it!!!

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05-13-2011 03:37 AM  6 years agoPost 36
bwarkent

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Houston Tx

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I think you misread the post. I am using the puh engine. I am simply converting a stratus to a spectra

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05-13-2011 03:41 AM  6 years agoPost 37
dre4473

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Clarksburg WVa

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Yes..I know..

I am in refference to the spark conversion for the stratus...Not the use of a PUH as in the pics of my spectra G..

Donald R. Edwards JR Fly it like you stole it!!!

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HelicopterGasser Model RC HelicoptersOther › Stratus from min air
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